diff --git a/build.gradle b/build.gradle
index 748905c1..d21f63a1 100644
--- a/build.gradle
+++ b/build.gradle
@@ -13,9 +13,9 @@ repositories {
 
 dependencies {
     api 'com.squareup.okhttp3:okhttp:4.12.0'
-    api 'com.fasterxml.jackson.core:jackson-databind:2.17.2'
-    api 'com.fasterxml.jackson.datatype:jackson-datatype-jdk8:2.17.2'
-    api 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.17.2'
+    api 'com.fasterxml.jackson.core:jackson-databind:2.13.0'
+    api 'com.fasterxml.jackson.datatype:jackson-datatype-jdk8:2.12.3'
+    api 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.12.3'
     implementation 'javax.websocket:javax.websocket-api:1.1'
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.2'
     testImplementation 'org.junit.jupiter:junit-jupiter-engine:5.8.2'
@@ -47,7 +47,7 @@ publishing {
         maven(MavenPublication) {
             groupId = 'com.assemblyai'
             artifactId = 'assemblyai-java'
-            version = '3.0.0'
+            version = '4.0.0'
             from components.java
             pom {
                 scm {
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index a4b76b95..2c352119 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 0aaefbca..09523c0e 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.10.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.9-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
diff --git a/src/main/java/com/assemblyai/api/core/FileStream.java b/src/main/java/com/assemblyai/api/core/FileStream.java
deleted file mode 100644
index f9eed113..00000000
--- a/src/main/java/com/assemblyai/api/core/FileStream.java
+++ /dev/null
@@ -1,60 +0,0 @@
-/**
- * This file was auto-generated by Fern from our API Definition.
- */
-package com.assemblyai.api.core;
-
-import java.io.InputStream;
-import java.util.Objects;
-import okhttp3.MediaType;
-import okhttp3.RequestBody;
-import org.jetbrains.annotations.Nullable;
-
-/**
- * Represents a file stream with associated metadata for file uploads.
- */
-public class FileStream {
-    private final InputStream inputStream;
-    private final String fileName;
-    private final MediaType contentType;
-
-    /**
-     * Constructs a FileStream with the given input stream and optional metadata.
-     *
-     * @param inputStream The input stream of the file content. Must not be null.
-     * @param fileName The name of the file, or null if unknown.
-     * @param contentType The MIME type of the file content, or null if unknown.
-     * @throws NullPointerException if inputStream is null
-     */
-    public FileStream(InputStream inputStream, @Nullable String fileName, @Nullable MediaType contentType) {
-        this.inputStream = Objects.requireNonNull(inputStream, "Input stream cannot be null");
-        this.fileName = fileName;
-        this.contentType = contentType;
-    }
-
-    public FileStream(InputStream inputStream) {
-        this(inputStream, null, null);
-    }
-
-    public InputStream getInputStream() {
-        return inputStream;
-    }
-
-    @Nullable
-    public String getFileName() {
-        return fileName;
-    }
-
-    @Nullable
-    public MediaType getContentType() {
-        return contentType;
-    }
-
-    /**
-     * Creates a RequestBody suitable for use with OkHttp client.
-     *
-     * @return A RequestBody instance representing this file stream.
-     */
-    public RequestBody toRequestBody() {
-        return new InputStreamRequestBody(contentType, inputStream);
-    }
-}
diff --git a/src/main/java/com/assemblyai/api/core/InputStreamRequestBody.java b/src/main/java/com/assemblyai/api/core/InputStreamRequestBody.java
deleted file mode 100644
index 1182fa44..00000000
--- a/src/main/java/com/assemblyai/api/core/InputStreamRequestBody.java
+++ /dev/null
@@ -1,79 +0,0 @@
-/**
- * This file was auto-generated by Fern from our API Definition.
- */
-package com.assemblyai.api.core;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.Objects;
-import okhttp3.MediaType;
-import okhttp3.RequestBody;
-import okhttp3.internal.Util;
-import okio.BufferedSink;
-import okio.Okio;
-import okio.Source;
-import org.jetbrains.annotations.Nullable;
-
-/**
- * A custom implementation of OkHttp's RequestBody that wraps an InputStream.
- * This class allows streaming of data from an InputStream directly to an HTTP request body,
- * which is useful for file uploads or sending large amounts of data without loading it all into memory.
- */
-public class InputStreamRequestBody extends RequestBody {
-    private final InputStream inputStream;
-    private final MediaType contentType;
-
-    /**
-     * Constructs an InputStreamRequestBody with the specified content type and input stream.
-     *
-     * @param contentType the MediaType of the content, or null if not known
-     * @param inputStream the InputStream containing the data to be sent
-     * @throws NullPointerException if inputStream is null
-     */
-    public InputStreamRequestBody(@Nullable MediaType contentType, InputStream inputStream) {
-        this.contentType = contentType;
-        this.inputStream = Objects.requireNonNull(inputStream, "inputStream == null");
-    }
-
-    /**
-     * Returns the content type of this request body.
-     *
-     * @return the MediaType of the content, or null if not specified
-     */
-    @Nullable
-    @Override
-    public MediaType contentType() {
-        return contentType;
-    }
-
-    /**
-     * Returns the content length of this request body, if known.
-     * This method attempts to determine the length using the InputStream's available() method,
-     * which may not always accurately reflect the total length of the stream.
-     *
-     * @return the content length, or -1 if the length is unknown
-     * @throws IOException if an I/O error occurs
-     */
-    @Override
-    public long contentLength() throws IOException {
-        return inputStream.available() == 0 ? -1 : inputStream.available();
-    }
-
-    /**
-     * Writes the content of the InputStream to the given BufferedSink.
-     * This method is responsible for transferring the data from the InputStream to the network request.
-     *
-     * @param sink the BufferedSink to write the content to
-     * @throws IOException if an I/O error occurs during writing
-     */
-    @Override
-    public void writeTo(BufferedSink sink) throws IOException {
-        Source source = null;
-        try {
-            source = Okio.source(inputStream);
-            sink.writeAll(source);
-        } finally {
-            Util.closeQuietly(Objects.requireNonNull(source));
-        }
-    }
-}
diff --git a/src/main/java/com/assemblyai/api/resources/files/FilesClient.java b/src/main/java/com/assemblyai/api/resources/files/FilesClient.java
index d7f73bcb..16650166 100644
--- a/src/main/java/com/assemblyai/api/resources/files/FilesClient.java
+++ b/src/main/java/com/assemblyai/api/resources/files/FilesClient.java
@@ -6,7 +6,6 @@
 import com.assemblyai.api.core.AssemblyAIApiException;
 import com.assemblyai.api.core.AssemblyAIException;
 import com.assemblyai.api.core.ClientOptions;
-import com.assemblyai.api.core.InputStreamRequestBody;
 import com.assemblyai.api.core.ObjectMappers;
 import com.assemblyai.api.core.RequestOptions;
 import com.assemblyai.api.errors.BadRequestError;
@@ -19,12 +18,9 @@
 import com.assemblyai.api.resources.files.types.UploadedFile;
 import com.assemblyai.api.types.Error;
 import com.fasterxml.jackson.core.JsonProcessingException;
-import java.io.ByteArrayInputStream;
 import java.io.IOException;
-import java.io.InputStream;
 import okhttp3.Headers;
 import okhttp3.HttpUrl;
-import okhttp3.MediaType;
 import okhttp3.OkHttpClient;
 import okhttp3.Request;
 import okhttp3.RequestBody;
@@ -41,23 +37,24 @@ public FilesClient(ClientOptions clientOptions) {
     /**
      * Upload a media file to AssemblyAI's servers.
      */
-    public UploadedFile upload(InputStream request) {
+    public UploadedFile upload(byte[] request) {
         return upload(request, null);
     }
 
     /**
      * Upload a media file to AssemblyAI's servers.
      */
-    public UploadedFile upload(InputStream request, RequestOptions requestOptions) {
+    public UploadedFile upload(byte[] request, RequestOptions requestOptions) {
         HttpUrl httpUrl = HttpUrl.parse(this.clientOptions.environment().getUrl())
                 .newBuilder()
                 .addPathSegments("v2/upload")
                 .build();
-        RequestBody body = new InputStreamRequestBody(MediaType.parse("application/octet-stream"), request);
+        RequestBody body = RequestBody.create(request);
         Request okhttpRequest = new Request.Builder()
                 .url(httpUrl)
                 .method("POST", body)
                 .headers(Headers.of(clientOptions.headers(requestOptions)))
+                .addHeader("Content-Type", "application/octet-stream")
                 .build();
         OkHttpClient client = clientOptions.httpClient();
         if (requestOptions != null && requestOptions.getTimeout().isPresent()) {
@@ -102,18 +99,4 @@ public UploadedFile upload(InputStream request, RequestOptions requestOptions) {
             throw new AssemblyAIException("Network error executing HTTP request", e);
         }
     }
-
-    /**
-     * Upload a media file to AssemblyAI's servers.
-     */
-    public UploadedFile upload(byte[] request) {
-        return upload(new ByteArrayInputStream(request));
-    }
-
-    /**
-     * Upload a media file to AssemblyAI's servers.
-     */
-    public UploadedFile upload(byte[] request, RequestOptions requestOptions) {
-        return upload(new ByteArrayInputStream(request), requestOptions);
-    }
 }
diff --git a/src/main/java/com/assemblyai/api/resources/files/types/UploadedFile.java b/src/main/java/com/assemblyai/api/resources/files/types/UploadedFile.java
index 1a48822d..0b6ae036 100644
--- a/src/main/java/com/assemblyai/api/resources/files/types/UploadedFile.java
+++ b/src/main/java/com/assemblyai/api/resources/files/types/UploadedFile.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = UploadedFile.Builder.class)
@@ -66,7 +65,7 @@ public static UploadUrlStage builder() {
     }
 
     public interface UploadUrlStage {
-        _FinalStage uploadUrl(@NotNull String uploadUrl);
+        _FinalStage uploadUrl(String uploadUrl);
 
         Builder from(UploadedFile other);
     }
@@ -96,8 +95,8 @@ public Builder from(UploadedFile other) {
          */
         @java.lang.Override
         @JsonSetter("upload_url")
-        public _FinalStage uploadUrl(@NotNull String uploadUrl) {
-            this.uploadUrl = Objects.requireNonNull(uploadUrl, "uploadUrl must not be null");
+        public _FinalStage uploadUrl(String uploadUrl) {
+            this.uploadUrl = uploadUrl;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/lemur/requests/LemurTaskParams.java b/src/main/java/com/assemblyai/api/resources/lemur/requests/LemurTaskParams.java
index 64abdb12..7a5d6116 100644
--- a/src/main/java/com/assemblyai/api/resources/lemur/requests/LemurTaskParams.java
+++ b/src/main/java/com/assemblyai/api/resources/lemur/requests/LemurTaskParams.java
@@ -20,7 +20,6 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = LemurTaskParams.Builder.class)
@@ -169,7 +168,7 @@ public static PromptStage builder() {
     }
 
     public interface PromptStage {
-        _FinalStage prompt(@NotNull String prompt);
+        _FinalStage prompt(String prompt);
 
         Builder from(LemurTaskParams other);
     }
@@ -241,8 +240,8 @@ public Builder from(LemurTaskParams other) {
          */
         @java.lang.Override
         @JsonSetter("prompt")
-        public _FinalStage prompt(@NotNull String prompt) {
-            this.prompt = Objects.requireNonNull(prompt, "prompt must not be null");
+        public _FinalStage prompt(String prompt) {
+            this.prompt = prompt;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurActionItemsResponse.java b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurActionItemsResponse.java
index cc797436..9aed7930 100644
--- a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurActionItemsResponse.java
+++ b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurActionItemsResponse.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = LemurActionItemsResponse.Builder.class)
@@ -92,17 +91,17 @@ public static ResponseStage builder() {
     }
 
     public interface ResponseStage {
-        RequestIdStage response(@NotNull String response);
+        RequestIdStage response(String response);
 
         Builder from(LemurActionItemsResponse other);
     }
 
     public interface RequestIdStage {
-        UsageStage requestId(@NotNull String requestId);
+        UsageStage requestId(String requestId);
     }
 
     public interface UsageStage {
-        _FinalStage usage(@NotNull LemurUsage usage);
+        _FinalStage usage(LemurUsage usage);
     }
 
     public interface _FinalStage {
@@ -136,8 +135,8 @@ public Builder from(LemurActionItemsResponse other) {
          */
         @java.lang.Override
         @JsonSetter("response")
-        public RequestIdStage response(@NotNull String response) {
-            this.response = Objects.requireNonNull(response, "response must not be null");
+        public RequestIdStage response(String response) {
+            this.response = response;
             return this;
         }
 
@@ -147,8 +146,8 @@ public RequestIdStage response(@NotNull String response) {
          */
         @java.lang.Override
         @JsonSetter("request_id")
-        public UsageStage requestId(@NotNull String requestId) {
-            this.requestId = Objects.requireNonNull(requestId, "requestId must not be null");
+        public UsageStage requestId(String requestId) {
+            this.requestId = requestId;
             return this;
         }
 
@@ -158,8 +157,8 @@ public UsageStage requestId(@NotNull String requestId) {
          */
         @java.lang.Override
         @JsonSetter("usage")
-        public _FinalStage usage(@NotNull LemurUsage usage) {
-            this.usage = Objects.requireNonNull(usage, "usage must not be null");
+        public _FinalStage usage(LemurUsage usage) {
+            this.usage = usage;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurBaseResponse.java b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurBaseResponse.java
index e439a3ea..899f4fb4 100644
--- a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurBaseResponse.java
+++ b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurBaseResponse.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = LemurBaseResponse.Builder.class)
@@ -79,13 +78,13 @@ public static RequestIdStage builder() {
     }
 
     public interface RequestIdStage {
-        UsageStage requestId(@NotNull String requestId);
+        UsageStage requestId(String requestId);
 
         Builder from(LemurBaseResponse other);
     }
 
     public interface UsageStage {
-        _FinalStage usage(@NotNull LemurUsage usage);
+        _FinalStage usage(LemurUsage usage);
     }
 
     public interface _FinalStage {
@@ -116,8 +115,8 @@ public Builder from(LemurBaseResponse other) {
          */
         @java.lang.Override
         @JsonSetter("request_id")
-        public UsageStage requestId(@NotNull String requestId) {
-            this.requestId = Objects.requireNonNull(requestId, "requestId must not be null");
+        public UsageStage requestId(String requestId) {
+            this.requestId = requestId;
             return this;
         }
 
@@ -127,8 +126,8 @@ public UsageStage requestId(@NotNull String requestId) {
          */
         @java.lang.Override
         @JsonSetter("usage")
-        public _FinalStage usage(@NotNull LemurUsage usage) {
-            this.usage = Objects.requireNonNull(usage, "usage must not be null");
+        public _FinalStage usage(LemurUsage usage) {
+            this.usage = usage;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurQuestion.java b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurQuestion.java
index c8d10f24..ac1857ce 100644
--- a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurQuestion.java
+++ b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurQuestion.java
@@ -17,7 +17,6 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = LemurQuestion.Builder.class)
@@ -110,7 +109,7 @@ public static QuestionStage builder() {
     }
 
     public interface QuestionStage {
-        _FinalStage question(@NotNull String question);
+        _FinalStage question(String question);
 
         Builder from(LemurQuestion other);
     }
@@ -161,8 +160,8 @@ public Builder from(LemurQuestion other) {
          */
         @java.lang.Override
         @JsonSetter("question")
-        public _FinalStage question(@NotNull String question) {
-            this.question = Objects.requireNonNull(question, "question must not be null");
+        public _FinalStage question(String question) {
+            this.question = question;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurQuestionAnswer.java b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurQuestionAnswer.java
index 0d2068f2..565657b0 100644
--- a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurQuestionAnswer.java
+++ b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurQuestionAnswer.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = LemurQuestionAnswer.Builder.class)
@@ -77,13 +76,13 @@ public static QuestionStage builder() {
     }
 
     public interface QuestionStage {
-        AnswerStage question(@NotNull String question);
+        AnswerStage question(String question);
 
         Builder from(LemurQuestionAnswer other);
     }
 
     public interface AnswerStage {
-        _FinalStage answer(@NotNull String answer);
+        _FinalStage answer(String answer);
     }
 
     public interface _FinalStage {
@@ -114,8 +113,8 @@ public Builder from(LemurQuestionAnswer other) {
          */
         @java.lang.Override
         @JsonSetter("question")
-        public AnswerStage question(@NotNull String question) {
-            this.question = Objects.requireNonNull(question, "question must not be null");
+        public AnswerStage question(String question) {
+            this.question = question;
             return this;
         }
 
@@ -125,8 +124,8 @@ public AnswerStage question(@NotNull String question) {
          */
         @java.lang.Override
         @JsonSetter("answer")
-        public _FinalStage answer(@NotNull String answer) {
-            this.answer = Objects.requireNonNull(answer, "answer must not be null");
+        public _FinalStage answer(String answer) {
+            this.answer = answer;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurQuestionAnswerResponse.java b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurQuestionAnswerResponse.java
index 400c027d..e4a51a1d 100644
--- a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurQuestionAnswerResponse.java
+++ b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurQuestionAnswerResponse.java
@@ -17,7 +17,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = LemurQuestionAnswerResponse.Builder.class)
@@ -97,13 +96,13 @@ public static RequestIdStage builder() {
     }
 
     public interface RequestIdStage {
-        UsageStage requestId(@NotNull String requestId);
+        UsageStage requestId(String requestId);
 
         Builder from(LemurQuestionAnswerResponse other);
     }
 
     public interface UsageStage {
-        _FinalStage usage(@NotNull LemurUsage usage);
+        _FinalStage usage(LemurUsage usage);
     }
 
     public interface _FinalStage {
@@ -143,8 +142,8 @@ public Builder from(LemurQuestionAnswerResponse other) {
          */
         @java.lang.Override
         @JsonSetter("request_id")
-        public UsageStage requestId(@NotNull String requestId) {
-            this.requestId = Objects.requireNonNull(requestId, "requestId must not be null");
+        public UsageStage requestId(String requestId) {
+            this.requestId = requestId;
             return this;
         }
 
@@ -154,8 +153,8 @@ public UsageStage requestId(@NotNull String requestId) {
          */
         @java.lang.Override
         @JsonSetter("usage")
-        public _FinalStage usage(@NotNull LemurUsage usage) {
-            this.usage = Objects.requireNonNull(usage, "usage must not be null");
+        public _FinalStage usage(LemurUsage usage) {
+            this.usage = usage;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurStringResponse.java b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurStringResponse.java
index 5368b46d..9090064d 100644
--- a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurStringResponse.java
+++ b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurStringResponse.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = LemurStringResponse.Builder.class)
@@ -92,17 +91,17 @@ public static ResponseStage builder() {
     }
 
     public interface ResponseStage {
-        RequestIdStage response(@NotNull String response);
+        RequestIdStage response(String response);
 
         Builder from(LemurStringResponse other);
     }
 
     public interface RequestIdStage {
-        UsageStage requestId(@NotNull String requestId);
+        UsageStage requestId(String requestId);
     }
 
     public interface UsageStage {
-        _FinalStage usage(@NotNull LemurUsage usage);
+        _FinalStage usage(LemurUsage usage);
     }
 
     public interface _FinalStage {
@@ -136,8 +135,8 @@ public Builder from(LemurStringResponse other) {
          */
         @java.lang.Override
         @JsonSetter("response")
-        public RequestIdStage response(@NotNull String response) {
-            this.response = Objects.requireNonNull(response, "response must not be null");
+        public RequestIdStage response(String response) {
+            this.response = response;
             return this;
         }
 
@@ -147,8 +146,8 @@ public RequestIdStage response(@NotNull String response) {
          */
         @java.lang.Override
         @JsonSetter("request_id")
-        public UsageStage requestId(@NotNull String requestId) {
-            this.requestId = Objects.requireNonNull(requestId, "requestId must not be null");
+        public UsageStage requestId(String requestId) {
+            this.requestId = requestId;
             return this;
         }
 
@@ -158,8 +157,8 @@ public UsageStage requestId(@NotNull String requestId) {
          */
         @java.lang.Override
         @JsonSetter("usage")
-        public _FinalStage usage(@NotNull LemurUsage usage) {
-            this.usage = Objects.requireNonNull(usage, "usage must not be null");
+        public _FinalStage usage(LemurUsage usage) {
+            this.usage = usage;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurSummaryResponse.java b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurSummaryResponse.java
index c679168f..c778ea4a 100644
--- a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurSummaryResponse.java
+++ b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurSummaryResponse.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = LemurSummaryResponse.Builder.class)
@@ -92,17 +91,17 @@ public static ResponseStage builder() {
     }
 
     public interface ResponseStage {
-        RequestIdStage response(@NotNull String response);
+        RequestIdStage response(String response);
 
         Builder from(LemurSummaryResponse other);
     }
 
     public interface RequestIdStage {
-        UsageStage requestId(@NotNull String requestId);
+        UsageStage requestId(String requestId);
     }
 
     public interface UsageStage {
-        _FinalStage usage(@NotNull LemurUsage usage);
+        _FinalStage usage(LemurUsage usage);
     }
 
     public interface _FinalStage {
@@ -136,8 +135,8 @@ public Builder from(LemurSummaryResponse other) {
          */
         @java.lang.Override
         @JsonSetter("response")
-        public RequestIdStage response(@NotNull String response) {
-            this.response = Objects.requireNonNull(response, "response must not be null");
+        public RequestIdStage response(String response) {
+            this.response = response;
             return this;
         }
 
@@ -147,8 +146,8 @@ public RequestIdStage response(@NotNull String response) {
          */
         @java.lang.Override
         @JsonSetter("request_id")
-        public UsageStage requestId(@NotNull String requestId) {
-            this.requestId = Objects.requireNonNull(requestId, "requestId must not be null");
+        public UsageStage requestId(String requestId) {
+            this.requestId = requestId;
             return this;
         }
 
@@ -158,8 +157,8 @@ public UsageStage requestId(@NotNull String requestId) {
          */
         @java.lang.Override
         @JsonSetter("usage")
-        public _FinalStage usage(@NotNull LemurUsage usage) {
-            this.usage = Objects.requireNonNull(usage, "usage must not be null");
+        public _FinalStage usage(LemurUsage usage) {
+            this.usage = usage;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurTaskResponse.java b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurTaskResponse.java
index c3aaf143..b1c6d0b1 100644
--- a/src/main/java/com/assemblyai/api/resources/lemur/types/LemurTaskResponse.java
+++ b/src/main/java/com/assemblyai/api/resources/lemur/types/LemurTaskResponse.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = LemurTaskResponse.Builder.class)
@@ -92,17 +91,17 @@ public static ResponseStage builder() {
     }
 
     public interface ResponseStage {
-        RequestIdStage response(@NotNull String response);
+        RequestIdStage response(String response);
 
         Builder from(LemurTaskResponse other);
     }
 
     public interface RequestIdStage {
-        UsageStage requestId(@NotNull String requestId);
+        UsageStage requestId(String requestId);
     }
 
     public interface UsageStage {
-        _FinalStage usage(@NotNull LemurUsage usage);
+        _FinalStage usage(LemurUsage usage);
     }
 
     public interface _FinalStage {
@@ -136,8 +135,8 @@ public Builder from(LemurTaskResponse other) {
          */
         @java.lang.Override
         @JsonSetter("response")
-        public RequestIdStage response(@NotNull String response) {
-            this.response = Objects.requireNonNull(response, "response must not be null");
+        public RequestIdStage response(String response) {
+            this.response = response;
             return this;
         }
 
@@ -147,8 +146,8 @@ public RequestIdStage response(@NotNull String response) {
          */
         @java.lang.Override
         @JsonSetter("request_id")
-        public UsageStage requestId(@NotNull String requestId) {
-            this.requestId = Objects.requireNonNull(requestId, "requestId must not be null");
+        public UsageStage requestId(String requestId) {
+            this.requestId = requestId;
             return this;
         }
 
@@ -158,8 +157,8 @@ public UsageStage requestId(@NotNull String requestId) {
          */
         @java.lang.Override
         @JsonSetter("usage")
-        public _FinalStage usage(@NotNull LemurUsage usage) {
-            this.usage = Objects.requireNonNull(usage, "usage must not be null");
+        public _FinalStage usage(LemurUsage usage) {
+            this.usage = usage;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/lemur/types/PurgeLemurRequestDataResponse.java b/src/main/java/com/assemblyai/api/resources/lemur/types/PurgeLemurRequestDataResponse.java
index 39c2fcfe..0a58bd96 100644
--- a/src/main/java/com/assemblyai/api/resources/lemur/types/PurgeLemurRequestDataResponse.java
+++ b/src/main/java/com/assemblyai/api/resources/lemur/types/PurgeLemurRequestDataResponse.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = PurgeLemurRequestDataResponse.Builder.class)
@@ -91,13 +90,13 @@ public static RequestIdStage builder() {
     }
 
     public interface RequestIdStage {
-        RequestIdToPurgeStage requestId(@NotNull String requestId);
+        RequestIdToPurgeStage requestId(String requestId);
 
         Builder from(PurgeLemurRequestDataResponse other);
     }
 
     public interface RequestIdToPurgeStage {
-        DeletedStage requestIdToPurge(@NotNull String requestIdToPurge);
+        DeletedStage requestIdToPurge(String requestIdToPurge);
     }
 
     public interface DeletedStage {
@@ -135,8 +134,8 @@ public Builder from(PurgeLemurRequestDataResponse other) {
          */
         @java.lang.Override
         @JsonSetter("request_id")
-        public RequestIdToPurgeStage requestId(@NotNull String requestId) {
-            this.requestId = Objects.requireNonNull(requestId, "requestId must not be null");
+        public RequestIdToPurgeStage requestId(String requestId) {
+            this.requestId = requestId;
             return this;
         }
 
@@ -146,8 +145,8 @@ public RequestIdToPurgeStage requestId(@NotNull String requestId) {
          */
         @java.lang.Override
         @JsonSetter("request_id_to_purge")
-        public DeletedStage requestIdToPurge(@NotNull String requestIdToPurge) {
-            this.requestIdToPurge = Objects.requireNonNull(requestIdToPurge, "requestIdToPurge must not be null");
+        public DeletedStage requestIdToPurge(String requestIdToPurge) {
+            this.requestIdToPurge = requestIdToPurge;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeBaseMessage.java b/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeBaseMessage.java
index 7d7d70fe..72eb0333 100644
--- a/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeBaseMessage.java
+++ b/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeBaseMessage.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = RealtimeBaseMessage.Builder.class)
@@ -66,7 +65,7 @@ public static MessageTypeStage builder() {
     }
 
     public interface MessageTypeStage {
-        _FinalStage messageType(@NotNull MessageType messageType);
+        _FinalStage messageType(MessageType messageType);
 
         Builder from(RealtimeBaseMessage other);
     }
@@ -96,8 +95,8 @@ public Builder from(RealtimeBaseMessage other) {
          */
         @java.lang.Override
         @JsonSetter("message_type")
-        public _FinalStage messageType(@NotNull MessageType messageType) {
-            this.messageType = Objects.requireNonNull(messageType, "messageType must not be null");
+        public _FinalStage messageType(MessageType messageType) {
+            this.messageType = messageType;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeBaseTranscript.java b/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeBaseTranscript.java
index 773965ac..d1f43b2e 100644
--- a/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeBaseTranscript.java
+++ b/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeBaseTranscript.java
@@ -18,7 +18,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = RealtimeBaseTranscript.Builder.class)
@@ -158,11 +157,11 @@ public interface ConfidenceStage {
     }
 
     public interface TextStage {
-        CreatedStage text(@NotNull String text);
+        CreatedStage text(String text);
     }
 
     public interface CreatedStage {
-        _FinalStage created(@NotNull OffsetDateTime created);
+        _FinalStage created(OffsetDateTime created);
     }
 
     public interface _FinalStage {
@@ -245,8 +244,8 @@ public TextStage confidence(double confidence) {
          */
         @java.lang.Override
         @JsonSetter("text")
-        public CreatedStage text(@NotNull String text) {
-            this.text = Objects.requireNonNull(text, "text must not be null");
+        public CreatedStage text(String text) {
+            this.text = text;
             return this;
         }
 
@@ -256,8 +255,8 @@ public CreatedStage text(@NotNull String text) {
          */
         @java.lang.Override
         @JsonSetter("created")
-        public _FinalStage created(@NotNull OffsetDateTime created) {
-            this.created = Objects.requireNonNull(created, "created must not be null");
+        public _FinalStage created(OffsetDateTime created) {
+            this.created = created;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeError.java b/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeError.java
index eb1e2a29..4ff09b97 100644
--- a/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeError.java
+++ b/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeError.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = RealtimeError.Builder.class)
@@ -63,7 +62,7 @@ public static ErrorStage builder() {
     }
 
     public interface ErrorStage {
-        _FinalStage error(@NotNull String error);
+        _FinalStage error(String error);
 
         Builder from(RealtimeError other);
     }
@@ -89,8 +88,8 @@ public Builder from(RealtimeError other) {
 
         @java.lang.Override
         @JsonSetter("error")
-        public _FinalStage error(@NotNull String error) {
-            this.error = Objects.requireNonNull(error, "error must not be null");
+        public _FinalStage error(String error) {
+            this.error = error;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeTemporaryTokenResponse.java b/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeTemporaryTokenResponse.java
index 7cdcf605..50d58c56 100644
--- a/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeTemporaryTokenResponse.java
+++ b/src/main/java/com/assemblyai/api/resources/realtime/types/RealtimeTemporaryTokenResponse.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = RealtimeTemporaryTokenResponse.Builder.class)
@@ -66,7 +65,7 @@ public static TokenStage builder() {
     }
 
     public interface TokenStage {
-        _FinalStage token(@NotNull String token);
+        _FinalStage token(String token);
 
         Builder from(RealtimeTemporaryTokenResponse other);
     }
@@ -96,8 +95,8 @@ public Builder from(RealtimeTemporaryTokenResponse other) {
          */
         @java.lang.Override
         @JsonSetter("token")
-        public _FinalStage token(@NotNull String token) {
-            this.token = Objects.requireNonNull(token, "token must not be null");
+        public _FinalStage token(String token) {
+            this.token = token;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/realtime/types/Word.java b/src/main/java/com/assemblyai/api/resources/realtime/types/Word.java
index 7745db0e..d35a00c0 100644
--- a/src/main/java/com/assemblyai/api/resources/realtime/types/Word.java
+++ b/src/main/java/com/assemblyai/api/resources/realtime/types/Word.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = Word.Builder.class)
@@ -113,7 +112,7 @@ public interface ConfidenceStage {
     }
 
     public interface TextStage {
-        _FinalStage text(@NotNull String text);
+        _FinalStage text(String text);
     }
 
     public interface _FinalStage {
@@ -183,8 +182,8 @@ public TextStage confidence(double confidence) {
          */
         @java.lang.Override
         @JsonSetter("text")
-        public _FinalStage text(@NotNull String text) {
-            this.text = Objects.requireNonNull(text, "text must not be null");
+        public _FinalStage text(String text) {
+            this.text = text;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/requests/ListTranscriptParams.java b/src/main/java/com/assemblyai/api/resources/transcripts/requests/ListTranscriptParams.java
index 48c7a2b9..39191237 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/requests/ListTranscriptParams.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/requests/ListTranscriptParams.java
@@ -21,7 +21,7 @@
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = ListTranscriptParams.Builder.class)
 public final class ListTranscriptParams {
-    private final Optional<Long> limit;
+    private final Optional<Integer> limit;
 
     private final Optional<TranscriptStatus> status;
 
@@ -36,7 +36,7 @@ public final class ListTranscriptParams {
     private final Map<String, Object> additionalProperties;
 
     private ListTranscriptParams(
-            Optional<Long> limit,
+            Optional<Integer> limit,
             Optional<TranscriptStatus> status,
             Optional<String> createdOn,
             Optional<String> beforeId,
@@ -56,7 +56,7 @@ private ListTranscriptParams(
      * @return Maximum amount of transcripts to retrieve
      */
     @JsonProperty("limit")
-    public Optional<Long> getLimit() {
+    public Optional<Integer> getLimit() {
         return limit;
     }
 
@@ -136,7 +136,7 @@ public static Builder builder() {
 
     @JsonIgnoreProperties(ignoreUnknown = true)
     public static final class Builder {
-        private Optional<Long> limit = Optional.empty();
+        private Optional<Integer> limit = Optional.empty();
 
         private Optional<TranscriptStatus> status = Optional.empty();
 
@@ -164,12 +164,12 @@ public Builder from(ListTranscriptParams other) {
         }
 
         @JsonSetter(value = "limit", nulls = Nulls.SKIP)
-        public Builder limit(Optional<Long> limit) {
+        public Builder limit(Optional<Integer> limit) {
             this.limit = limit;
             return this;
         }
 
-        public Builder limit(Long limit) {
+        public Builder limit(Integer limit) {
             this.limit = Optional.ofNullable(limit);
             return this;
         }
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/requests/TranscriptParams.java b/src/main/java/com/assemblyai/api/resources/transcripts/requests/TranscriptParams.java
index 4be2637f..d333ae5a 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/requests/TranscriptParams.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/requests/TranscriptParams.java
@@ -27,7 +27,6 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = TranscriptParams.Builder.class)
@@ -46,6 +45,8 @@ public final class TranscriptParams implements ITranscriptOptionalParams {
 
     private final Optional<Boolean> disfluencies;
 
+    private final Optional<Boolean> multichannel;
+
     private final Optional<Boolean> dualChannel;
 
     private final Optional<String> webhookUrl;
@@ -118,6 +119,7 @@ private TranscriptParams(
             Optional<Boolean> punctuate,
             Optional<Boolean> formatText,
             Optional<Boolean> disfluencies,
+            Optional<Boolean> multichannel,
             Optional<Boolean> dualChannel,
             Optional<String> webhookUrl,
             Optional<String> webhookAuthHeaderName,
@@ -157,6 +159,7 @@ private TranscriptParams(
         this.punctuate = punctuate;
         this.formatText = formatText;
         this.disfluencies = disfluencies;
+        this.multichannel = multichannel;
         this.dualChannel = dualChannel;
         this.webhookUrl = webhookUrl;
         this.webhookAuthHeaderName = webhookAuthHeaderName;
@@ -250,6 +253,15 @@ public Optional<Boolean> getDisfluencies() {
         return disfluencies;
     }
 
+    /**
+     * @return Enable <a href="https://www.assemblyai.com/docs/models/speech-recognition#multichannel-transcription">Multichannel</a> transcription, can be true or false.
+     */
+    @JsonProperty("multichannel")
+    @java.lang.Override
+    public Optional<Boolean> getMultichannel() {
+        return multichannel;
+    }
+
     /**
      * @return Enable <a href="https://www.assemblyai.com/docs/models/speech-recognition#dual-channel-transcription">Dual Channel</a> transcription, can be true or false.
      */
@@ -547,6 +559,7 @@ private boolean equalTo(TranscriptParams other) {
                 && punctuate.equals(other.punctuate)
                 && formatText.equals(other.formatText)
                 && disfluencies.equals(other.disfluencies)
+                && multichannel.equals(other.multichannel)
                 && dualChannel.equals(other.dualChannel)
                 && webhookUrl.equals(other.webhookUrl)
                 && webhookAuthHeaderName.equals(other.webhookAuthHeaderName)
@@ -590,6 +603,7 @@ public int hashCode() {
                 this.punctuate,
                 this.formatText,
                 this.disfluencies,
+                this.multichannel,
                 this.dualChannel,
                 this.webhookUrl,
                 this.webhookAuthHeaderName,
@@ -633,7 +647,7 @@ public static AudioUrlStage builder() {
     }
 
     public interface AudioUrlStage {
-        _FinalStage audioUrl(@NotNull String audioUrl);
+        _FinalStage audioUrl(String audioUrl);
 
         Builder from(TranscriptParams other);
     }
@@ -669,6 +683,10 @@ public interface _FinalStage {
 
         _FinalStage disfluencies(Boolean disfluencies);
 
+        _FinalStage multichannel(Optional<Boolean> multichannel);
+
+        _FinalStage multichannel(Boolean multichannel);
+
         _FinalStage dualChannel(Optional<Boolean> dualChannel);
 
         _FinalStage dualChannel(Boolean dualChannel);
@@ -854,6 +872,8 @@ public static final class Builder implements AudioUrlStage, _FinalStage {
 
         private Optional<Boolean> dualChannel = Optional.empty();
 
+        private Optional<Boolean> multichannel = Optional.empty();
+
         private Optional<Boolean> disfluencies = Optional.empty();
 
         private Optional<Boolean> formatText = Optional.empty();
@@ -882,6 +902,7 @@ public Builder from(TranscriptParams other) {
             punctuate(other.getPunctuate());
             formatText(other.getFormatText());
             disfluencies(other.getDisfluencies());
+            multichannel(other.getMultichannel());
             dualChannel(other.getDualChannel());
             webhookUrl(other.getWebhookUrl());
             webhookAuthHeaderName(other.getWebhookAuthHeaderName());
@@ -922,8 +943,8 @@ public Builder from(TranscriptParams other) {
          */
         @java.lang.Override
         @JsonSetter("audio_url")
-        public _FinalStage audioUrl(@NotNull String audioUrl) {
-            this.audioUrl = Objects.requireNonNull(audioUrl, "audioUrl must not be null");
+        public _FinalStage audioUrl(String audioUrl) {
+            this.audioUrl = audioUrl;
             return this;
         }
 
@@ -1436,6 +1457,23 @@ public _FinalStage dualChannel(Optional<Boolean> dualChannel) {
             return this;
         }
 
+        /**
+         * <p>Enable <a href="https://www.assemblyai.com/docs/models/speech-recognition#multichannel-transcription">Multichannel</a> transcription, can be true or false.</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
+        @java.lang.Override
+        public _FinalStage multichannel(Boolean multichannel) {
+            this.multichannel = Optional.ofNullable(multichannel);
+            return this;
+        }
+
+        @java.lang.Override
+        @JsonSetter(value = "multichannel", nulls = Nulls.SKIP)
+        public _FinalStage multichannel(Optional<Boolean> multichannel) {
+            this.multichannel = multichannel;
+            return this;
+        }
+
         /**
          * <p>Transcribe Filler Words, like &quot;umm&quot;, in your media file; can be true or false</p>
          * @return Reference to {@code this} so that method calls can be chained together.
@@ -1559,6 +1597,7 @@ public TranscriptParams build() {
                     punctuate,
                     formatText,
                     disfluencies,
+                    multichannel,
                     dualChannel,
                     webhookUrl,
                     webhookAuthHeaderName,
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/AutoHighlightResult.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/AutoHighlightResult.java
index 070aeb8e..3d1de8e8 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/AutoHighlightResult.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/AutoHighlightResult.java
@@ -17,7 +17,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = AutoHighlightResult.Builder.class)
@@ -116,7 +115,7 @@ public interface RankStage {
     }
 
     public interface TextStage {
-        _FinalStage text(@NotNull String text);
+        _FinalStage text(String text);
     }
 
     public interface _FinalStage {
@@ -181,8 +180,8 @@ public TextStage rank(double rank) {
          */
         @java.lang.Override
         @JsonSetter("text")
-        public _FinalStage text(@NotNull String text) {
-            this.text = Objects.requireNonNull(text, "text must not be null");
+        public _FinalStage text(String text) {
+            this.text = text;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/AutoHighlightsResult.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/AutoHighlightsResult.java
index f59f439d..18966b5e 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/AutoHighlightsResult.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/AutoHighlightsResult.java
@@ -17,7 +17,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = AutoHighlightsResult.Builder.class)
@@ -83,7 +82,7 @@ public static StatusStage builder() {
     }
 
     public interface StatusStage {
-        _FinalStage status(@NotNull AudioIntelligenceModelStatus status);
+        _FinalStage status(AudioIntelligenceModelStatus status);
 
         Builder from(AutoHighlightsResult other);
     }
@@ -122,8 +121,8 @@ public Builder from(AutoHighlightsResult other) {
          */
         @java.lang.Override
         @JsonSetter("status")
-        public _FinalStage status(@NotNull AudioIntelligenceModelStatus status) {
-            this.status = Objects.requireNonNull(status, "status must not be null");
+        public _FinalStage status(AudioIntelligenceModelStatus status) {
+            this.status = status;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/Chapter.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/Chapter.java
index d91024c4..c5ac605a 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/Chapter.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/Chapter.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = Chapter.Builder.class)
@@ -120,17 +119,17 @@ public static GistStage builder() {
     }
 
     public interface GistStage {
-        HeadlineStage gist(@NotNull String gist);
+        HeadlineStage gist(String gist);
 
         Builder from(Chapter other);
     }
 
     public interface HeadlineStage {
-        SummaryStage headline(@NotNull String headline);
+        SummaryStage headline(String headline);
     }
 
     public interface SummaryStage {
-        StartStage summary(@NotNull String summary);
+        StartStage summary(String summary);
     }
 
     public interface StartStage {
@@ -179,8 +178,8 @@ public Builder from(Chapter other) {
          */
         @java.lang.Override
         @JsonSetter("gist")
-        public HeadlineStage gist(@NotNull String gist) {
-            this.gist = Objects.requireNonNull(gist, "gist must not be null");
+        public HeadlineStage gist(String gist) {
+            this.gist = gist;
             return this;
         }
 
@@ -190,8 +189,8 @@ public HeadlineStage gist(@NotNull String gist) {
          */
         @java.lang.Override
         @JsonSetter("headline")
-        public SummaryStage headline(@NotNull String headline) {
-            this.headline = Objects.requireNonNull(headline, "headline must not be null");
+        public SummaryStage headline(String headline) {
+            this.headline = headline;
             return this;
         }
 
@@ -201,8 +200,8 @@ public SummaryStage headline(@NotNull String headline) {
          */
         @java.lang.Override
         @JsonSetter("summary")
-        public StartStage summary(@NotNull String summary) {
-            this.summary = Objects.requireNonNull(summary, "summary must not be null");
+        public StartStage summary(String summary) {
+            this.summary = summary;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/ContentSafetyLabel.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/ContentSafetyLabel.java
index d701e425..ac64e0cb 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/ContentSafetyLabel.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/ContentSafetyLabel.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = ContentSafetyLabel.Builder.class)
@@ -89,7 +88,7 @@ public static LabelStage builder() {
     }
 
     public interface LabelStage {
-        ConfidenceStage label(@NotNull String label);
+        ConfidenceStage label(String label);
 
         Builder from(ContentSafetyLabel other);
     }
@@ -133,8 +132,8 @@ public Builder from(ContentSafetyLabel other) {
          */
         @java.lang.Override
         @JsonSetter("label")
-        public ConfidenceStage label(@NotNull String label) {
-            this.label = Objects.requireNonNull(label, "label must not be null");
+        public ConfidenceStage label(String label) {
+            this.label = label;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/ContentSafetyLabelResult.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/ContentSafetyLabelResult.java
index 1e0a445a..7e5239c1 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/ContentSafetyLabelResult.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/ContentSafetyLabelResult.java
@@ -17,7 +17,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = ContentSafetyLabelResult.Builder.class)
@@ -123,7 +122,7 @@ public static TextStage builder() {
     }
 
     public interface TextStage {
-        SentencesIdxStartStage text(@NotNull String text);
+        SentencesIdxStartStage text(String text);
 
         Builder from(ContentSafetyLabelResult other);
     }
@@ -137,7 +136,7 @@ public interface SentencesIdxEndStage {
     }
 
     public interface TimestampStage {
-        _FinalStage timestamp(@NotNull Timestamp timestamp);
+        _FinalStage timestamp(Timestamp timestamp);
     }
 
     public interface _FinalStage {
@@ -184,8 +183,8 @@ public Builder from(ContentSafetyLabelResult other) {
          */
         @java.lang.Override
         @JsonSetter("text")
-        public SentencesIdxStartStage text(@NotNull String text) {
-            this.text = Objects.requireNonNull(text, "text must not be null");
+        public SentencesIdxStartStage text(String text) {
+            this.text = text;
             return this;
         }
 
@@ -217,8 +216,8 @@ public TimestampStage sentencesIdxEnd(int sentencesIdxEnd) {
          */
         @java.lang.Override
         @JsonSetter("timestamp")
-        public _FinalStage timestamp(@NotNull Timestamp timestamp) {
-            this.timestamp = Objects.requireNonNull(timestamp, "timestamp must not be null");
+        public _FinalStage timestamp(Timestamp timestamp) {
+            this.timestamp = timestamp;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/ContentSafetyLabelsResult.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/ContentSafetyLabelsResult.java
index 0ce23a23..83d02f0f 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/ContentSafetyLabelsResult.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/ContentSafetyLabelsResult.java
@@ -18,7 +18,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = ContentSafetyLabelsResult.Builder.class)
@@ -54,6 +53,9 @@ public AudioIntelligenceModelStatus getStatus() {
         return status;
     }
 
+    /**
+     * @return An array of results for the Content Moderation model
+     */
     @JsonProperty("results")
     public List<ContentSafetyLabelResult> getResults() {
         return results;
@@ -108,7 +110,7 @@ public static StatusStage builder() {
     }
 
     public interface StatusStage {
-        _FinalStage status(@NotNull AudioIntelligenceModelStatus status);
+        _FinalStage status(AudioIntelligenceModelStatus status);
 
         Builder from(ContentSafetyLabelsResult other);
     }
@@ -165,8 +167,8 @@ public Builder from(ContentSafetyLabelsResult other) {
          */
         @java.lang.Override
         @JsonSetter("status")
-        public _FinalStage status(@NotNull AudioIntelligenceModelStatus status) {
-            this.status = Objects.requireNonNull(status, "status must not be null");
+        public _FinalStage status(AudioIntelligenceModelStatus status) {
+            this.status = status;
             return this;
         }
 
@@ -226,12 +228,20 @@ public _FinalStage summary(Map<String, Double> summary) {
             return this;
         }
 
+        /**
+         * <p>An array of results for the Content Moderation model</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         public _FinalStage addAllResults(List<ContentSafetyLabelResult> results) {
             this.results.addAll(results);
             return this;
         }
 
+        /**
+         * <p>An array of results for the Content Moderation model</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         public _FinalStage addResults(ContentSafetyLabelResult results) {
             this.results.add(results);
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/Entity.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/Entity.java
index 2a1fdd5c..e0363a32 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/Entity.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/Entity.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = Entity.Builder.class)
@@ -102,13 +101,13 @@ public static EntityTypeStage builder() {
     }
 
     public interface EntityTypeStage {
-        TextStage entityType(@NotNull EntityType entityType);
+        TextStage entityType(EntityType entityType);
 
         Builder from(Entity other);
     }
 
     public interface TextStage {
-        StartStage text(@NotNull String text);
+        StartStage text(String text);
     }
 
     public interface StartStage {
@@ -153,8 +152,8 @@ public Builder from(Entity other) {
          */
         @java.lang.Override
         @JsonSetter("entity_type")
-        public TextStage entityType(@NotNull EntityType entityType) {
-            this.entityType = Objects.requireNonNull(entityType, "entityType must not be null");
+        public TextStage entityType(EntityType entityType) {
+            this.entityType = entityType;
             return this;
         }
 
@@ -164,8 +163,8 @@ public TextStage entityType(@NotNull EntityType entityType) {
          */
         @java.lang.Override
         @JsonSetter("text")
-        public StartStage text(@NotNull String text) {
-            this.text = Objects.requireNonNull(text, "text must not be null");
+        public StartStage text(String text) {
+            this.text = text;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/ITranscriptOptionalParams.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/ITranscriptOptionalParams.java
index 06684f10..b130e029 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/ITranscriptOptionalParams.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/ITranscriptOptionalParams.java
@@ -21,6 +21,8 @@ public interface ITranscriptOptionalParams {
 
     Optional<Boolean> getDisfluencies();
 
+    Optional<Boolean> getMultichannel();
+
     Optional<Boolean> getDualChannel();
 
     Optional<String> getWebhookUrl();
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/PageDetails.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/PageDetails.java
index 99fcd7ba..a32f3c77 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/PageDetails.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/PageDetails.java
@@ -16,7 +16,6 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = PageDetails.Builder.class)
@@ -132,7 +131,7 @@ public interface ResultCountStage {
     }
 
     public interface CurrentUrlStage {
-        _FinalStage currentUrl(@NotNull String currentUrl);
+        _FinalStage currentUrl(String currentUrl);
     }
 
     public interface _FinalStage {
@@ -202,8 +201,8 @@ public CurrentUrlStage resultCount(int resultCount) {
          */
         @java.lang.Override
         @JsonSetter("current_url")
-        public _FinalStage currentUrl(@NotNull String currentUrl) {
-            this.currentUrl = Objects.requireNonNull(currentUrl, "currentUrl must not be null");
+        public _FinalStage currentUrl(String currentUrl) {
+            this.currentUrl = currentUrl;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/ParagraphsResponse.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/ParagraphsResponse.java
index c7b09a34..da1ce0d3 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/ParagraphsResponse.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/ParagraphsResponse.java
@@ -17,7 +17,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = ParagraphsResponse.Builder.class)
@@ -45,21 +44,33 @@ private ParagraphsResponse(
         this.additionalProperties = additionalProperties;
     }
 
+    /**
+     * @return The unique identifier of your transcript
+     */
     @JsonProperty("id")
     public String getId() {
         return id;
     }
 
+    /**
+     * @return The confidence score for the transcript
+     */
     @JsonProperty("confidence")
     public double getConfidence() {
         return confidence;
     }
 
+    /**
+     * @return The duration of the audio file in seconds
+     */
     @JsonProperty("audio_duration")
     public double getAudioDuration() {
         return audioDuration;
     }
 
+    /**
+     * @return An array of paragraphs in the transcript
+     */
     @JsonProperty("paragraphs")
     public List<TranscriptParagraph> getParagraphs() {
         return paragraphs;
@@ -98,7 +109,7 @@ public static IdStage builder() {
     }
 
     public interface IdStage {
-        ConfidenceStage id(@NotNull String id);
+        ConfidenceStage id(String id);
 
         Builder from(ParagraphsResponse other);
     }
@@ -145,13 +156,21 @@ public Builder from(ParagraphsResponse other) {
             return this;
         }
 
+        /**
+         * <p>The unique identifier of your transcript</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("id")
-        public ConfidenceStage id(@NotNull String id) {
-            this.id = Objects.requireNonNull(id, "id must not be null");
+        public ConfidenceStage id(String id) {
+            this.id = id;
             return this;
         }
 
+        /**
+         * <p>The confidence score for the transcript</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("confidence")
         public AudioDurationStage confidence(double confidence) {
@@ -159,6 +178,10 @@ public AudioDurationStage confidence(double confidence) {
             return this;
         }
 
+        /**
+         * <p>The duration of the audio file in seconds</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("audio_duration")
         public _FinalStage audioDuration(double audioDuration) {
@@ -166,12 +189,20 @@ public _FinalStage audioDuration(double audioDuration) {
             return this;
         }
 
+        /**
+         * <p>An array of paragraphs in the transcript</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         public _FinalStage addAllParagraphs(List<TranscriptParagraph> paragraphs) {
             this.paragraphs.addAll(paragraphs);
             return this;
         }
 
+        /**
+         * <p>An array of paragraphs in the transcript</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         public _FinalStage addParagraphs(TranscriptParagraph paragraphs) {
             this.paragraphs.add(paragraphs);
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/RedactedAudioResponse.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/RedactedAudioResponse.java
index affaf542..0e7d0028 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/RedactedAudioResponse.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/RedactedAudioResponse.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = RedactedAudioResponse.Builder.class)
@@ -77,13 +76,13 @@ public static StatusStage builder() {
     }
 
     public interface StatusStage {
-        RedactedAudioUrlStage status(@NotNull String status);
+        RedactedAudioUrlStage status(String status);
 
         Builder from(RedactedAudioResponse other);
     }
 
     public interface RedactedAudioUrlStage {
-        _FinalStage redactedAudioUrl(@NotNull String redactedAudioUrl);
+        _FinalStage redactedAudioUrl(String redactedAudioUrl);
     }
 
     public interface _FinalStage {
@@ -114,8 +113,8 @@ public Builder from(RedactedAudioResponse other) {
          */
         @java.lang.Override
         @JsonSetter("status")
-        public RedactedAudioUrlStage status(@NotNull String status) {
-            this.status = Objects.requireNonNull(status, "status must not be null");
+        public RedactedAudioUrlStage status(String status) {
+            this.status = status;
             return this;
         }
 
@@ -125,8 +124,8 @@ public RedactedAudioUrlStage status(@NotNull String status) {
          */
         @java.lang.Override
         @JsonSetter("redacted_audio_url")
-        public _FinalStage redactedAudioUrl(@NotNull String redactedAudioUrl) {
-            this.redactedAudioUrl = Objects.requireNonNull(redactedAudioUrl, "redactedAudioUrl must not be null");
+        public _FinalStage redactedAudioUrl(String redactedAudioUrl) {
+            this.redactedAudioUrl = redactedAudioUrl;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/SentencesResponse.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/SentencesResponse.java
index d1c9ef7b..667e95aa 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/SentencesResponse.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/SentencesResponse.java
@@ -17,7 +17,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = SentencesResponse.Builder.class)
@@ -45,21 +44,33 @@ private SentencesResponse(
         this.additionalProperties = additionalProperties;
     }
 
+    /**
+     * @return The unique identifier for the transcript
+     */
     @JsonProperty("id")
     public String getId() {
         return id;
     }
 
+    /**
+     * @return The confidence score for the transcript
+     */
     @JsonProperty("confidence")
     public double getConfidence() {
         return confidence;
     }
 
+    /**
+     * @return The duration of the audio file in seconds
+     */
     @JsonProperty("audio_duration")
     public double getAudioDuration() {
         return audioDuration;
     }
 
+    /**
+     * @return An array of sentences in the transcript
+     */
     @JsonProperty("sentences")
     public List<TranscriptSentence> getSentences() {
         return sentences;
@@ -98,7 +109,7 @@ public static IdStage builder() {
     }
 
     public interface IdStage {
-        ConfidenceStage id(@NotNull String id);
+        ConfidenceStage id(String id);
 
         Builder from(SentencesResponse other);
     }
@@ -145,13 +156,21 @@ public Builder from(SentencesResponse other) {
             return this;
         }
 
+        /**
+         * <p>The unique identifier for the transcript</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("id")
-        public ConfidenceStage id(@NotNull String id) {
-            this.id = Objects.requireNonNull(id, "id must not be null");
+        public ConfidenceStage id(String id) {
+            this.id = id;
             return this;
         }
 
+        /**
+         * <p>The confidence score for the transcript</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("confidence")
         public AudioDurationStage confidence(double confidence) {
@@ -159,6 +178,10 @@ public AudioDurationStage confidence(double confidence) {
             return this;
         }
 
+        /**
+         * <p>The duration of the audio file in seconds</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("audio_duration")
         public _FinalStage audioDuration(double audioDuration) {
@@ -166,12 +189,20 @@ public _FinalStage audioDuration(double audioDuration) {
             return this;
         }
 
+        /**
+         * <p>An array of sentences in the transcript</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         public _FinalStage addAllSentences(List<TranscriptSentence> sentences) {
             this.sentences.addAll(sentences);
             return this;
         }
 
+        /**
+         * <p>An array of sentences in the transcript</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         public _FinalStage addSentences(TranscriptSentence sentences) {
             this.sentences.add(sentences);
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/SentimentAnalysisResult.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/SentimentAnalysisResult.java
index 7e413349..108a9971 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/SentimentAnalysisResult.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/SentimentAnalysisResult.java
@@ -16,7 +16,6 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = SentimentAnalysisResult.Builder.class)
@@ -31,6 +30,8 @@ public final class SentimentAnalysisResult {
 
     private final double confidence;
 
+    private final Optional<String> channel;
+
     private final Optional<String> speaker;
 
     private final Map<String, Object> additionalProperties;
@@ -41,6 +42,7 @@ private SentimentAnalysisResult(
             int end,
             Sentiment sentiment,
             double confidence,
+            Optional<String> channel,
             Optional<String> speaker,
             Map<String, Object> additionalProperties) {
         this.text = text;
@@ -48,6 +50,7 @@ private SentimentAnalysisResult(
         this.end = end;
         this.sentiment = sentiment;
         this.confidence = confidence;
+        this.channel = channel;
         this.speaker = speaker;
         this.additionalProperties = additionalProperties;
     }
@@ -92,6 +95,14 @@ public double getConfidence() {
         return confidence;
     }
 
+    /**
+     * @return The channel of this utterance. The left and right channels are channels 1 and 2. Additional channels increment the channel number sequentially.
+     */
+    @JsonProperty("channel")
+    public Optional<String> getChannel() {
+        return channel;
+    }
+
     /**
      * @return The speaker of the sentence if <a href="https://www.assemblyai.com/docs/models/speaker-diarization">Speaker Diarization</a> is enabled, else null
      */
@@ -117,12 +128,14 @@ private boolean equalTo(SentimentAnalysisResult other) {
                 && end == other.end
                 && sentiment.equals(other.sentiment)
                 && confidence == other.confidence
+                && channel.equals(other.channel)
                 && speaker.equals(other.speaker);
     }
 
     @java.lang.Override
     public int hashCode() {
-        return Objects.hash(this.text, this.start, this.end, this.sentiment, this.confidence, this.speaker);
+        return Objects.hash(
+                this.text, this.start, this.end, this.sentiment, this.confidence, this.channel, this.speaker);
     }
 
     @java.lang.Override
@@ -135,7 +148,7 @@ public static TextStage builder() {
     }
 
     public interface TextStage {
-        StartStage text(@NotNull String text);
+        StartStage text(String text);
 
         Builder from(SentimentAnalysisResult other);
     }
@@ -149,7 +162,7 @@ public interface EndStage {
     }
 
     public interface SentimentStage {
-        ConfidenceStage sentiment(@NotNull Sentiment sentiment);
+        ConfidenceStage sentiment(Sentiment sentiment);
     }
 
     public interface ConfidenceStage {
@@ -159,6 +172,10 @@ public interface ConfidenceStage {
     public interface _FinalStage {
         SentimentAnalysisResult build();
 
+        _FinalStage channel(Optional<String> channel);
+
+        _FinalStage channel(String channel);
+
         _FinalStage speaker(Optional<String> speaker);
 
         _FinalStage speaker(String speaker);
@@ -179,6 +196,8 @@ public static final class Builder
 
         private Optional<String> speaker = Optional.empty();
 
+        private Optional<String> channel = Optional.empty();
+
         @JsonAnySetter
         private Map<String, Object> additionalProperties = new HashMap<>();
 
@@ -191,6 +210,7 @@ public Builder from(SentimentAnalysisResult other) {
             end(other.getEnd());
             sentiment(other.getSentiment());
             confidence(other.getConfidence());
+            channel(other.getChannel());
             speaker(other.getSpeaker());
             return this;
         }
@@ -201,8 +221,8 @@ public Builder from(SentimentAnalysisResult other) {
          */
         @java.lang.Override
         @JsonSetter("text")
-        public StartStage text(@NotNull String text) {
-            this.text = Objects.requireNonNull(text, "text must not be null");
+        public StartStage text(String text) {
+            this.text = text;
             return this;
         }
 
@@ -234,8 +254,8 @@ public SentimentStage end(int end) {
          */
         @java.lang.Override
         @JsonSetter("sentiment")
-        public ConfidenceStage sentiment(@NotNull Sentiment sentiment) {
-            this.sentiment = Objects.requireNonNull(sentiment, "sentiment must not be null");
+        public ConfidenceStage sentiment(Sentiment sentiment) {
+            this.sentiment = sentiment;
             return this;
         }
 
@@ -267,9 +287,27 @@ public _FinalStage speaker(Optional<String> speaker) {
             return this;
         }
 
+        /**
+         * <p>The channel of this utterance. The left and right channels are channels 1 and 2. Additional channels increment the channel number sequentially.</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
+        @java.lang.Override
+        public _FinalStage channel(String channel) {
+            this.channel = Optional.ofNullable(channel);
+            return this;
+        }
+
+        @java.lang.Override
+        @JsonSetter(value = "channel", nulls = Nulls.SKIP)
+        public _FinalStage channel(Optional<String> channel) {
+            this.channel = channel;
+            return this;
+        }
+
         @java.lang.Override
         public SentimentAnalysisResult build() {
-            return new SentimentAnalysisResult(text, start, end, sentiment, confidence, speaker, additionalProperties);
+            return new SentimentAnalysisResult(
+                    text, start, end, sentiment, confidence, channel, speaker, additionalProperties);
         }
     }
 }
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/TopicDetectionModelResult.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/TopicDetectionModelResult.java
index cb5d28e5..6dc59595 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/TopicDetectionModelResult.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/TopicDetectionModelResult.java
@@ -18,7 +18,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = TopicDetectionModelResult.Builder.class)
@@ -96,7 +95,7 @@ public static StatusStage builder() {
     }
 
     public interface StatusStage {
-        _FinalStage status(@NotNull AudioIntelligenceModelStatus status);
+        _FinalStage status(AudioIntelligenceModelStatus status);
 
         Builder from(TopicDetectionModelResult other);
     }
@@ -144,8 +143,8 @@ public Builder from(TopicDetectionModelResult other) {
          */
         @java.lang.Override
         @JsonSetter("status")
-        public _FinalStage status(@NotNull AudioIntelligenceModelStatus status) {
-            this.status = Objects.requireNonNull(status, "status must not be null");
+        public _FinalStage status(AudioIntelligenceModelStatus status) {
+            this.status = status;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/TopicDetectionResult.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/TopicDetectionResult.java
index df39ebc5..31c6f1d8 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/TopicDetectionResult.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/TopicDetectionResult.java
@@ -17,7 +17,6 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = TopicDetectionResult.Builder.class)
@@ -49,6 +48,9 @@ public String getText() {
         return text;
     }
 
+    /**
+     * @return An array of detected topics in the text
+     */
     @JsonProperty("labels")
     public Optional<List<TopicDetectionResultLabelsItem>> getLabels() {
         return labels;
@@ -89,7 +91,7 @@ public static TextStage builder() {
     }
 
     public interface TextStage {
-        _FinalStage text(@NotNull String text);
+        _FinalStage text(String text);
 
         Builder from(TopicDetectionResult other);
     }
@@ -133,8 +135,8 @@ public Builder from(TopicDetectionResult other) {
          */
         @java.lang.Override
         @JsonSetter("text")
-        public _FinalStage text(@NotNull String text) {
-            this.text = Objects.requireNonNull(text, "text must not be null");
+        public _FinalStage text(String text) {
+            this.text = text;
             return this;
         }
 
@@ -151,6 +153,10 @@ public _FinalStage timestamp(Optional<Timestamp> timestamp) {
             return this;
         }
 
+        /**
+         * <p>An array of detected topics in the text</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         public _FinalStage labels(List<TopicDetectionResultLabelsItem> labels) {
             this.labels = Optional.ofNullable(labels);
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/TopicDetectionResultLabelsItem.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/TopicDetectionResultLabelsItem.java
index dc8a6a2a..ecf37434 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/TopicDetectionResultLabelsItem.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/TopicDetectionResultLabelsItem.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = TopicDetectionResultLabelsItem.Builder.class)
@@ -83,7 +82,7 @@ public interface RelevanceStage {
     }
 
     public interface LabelStage {
-        _FinalStage label(@NotNull String label);
+        _FinalStage label(String label);
     }
 
     public interface _FinalStage {
@@ -125,8 +124,8 @@ public LabelStage relevance(double relevance) {
          */
         @java.lang.Override
         @JsonSetter("label")
-        public _FinalStage label(@NotNull String label) {
-            this.label = Objects.requireNonNull(label, "label must not be null");
+        public _FinalStage label(String label) {
+            this.label = label;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/Transcript.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/Transcript.java
index 1a44e3f1..7efd9b07 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/Transcript.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/Transcript.java
@@ -17,7 +17,6 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = Transcript.Builder.class)
@@ -54,6 +53,10 @@ public final class Transcript {
 
     private final Optional<Boolean> disfluencies;
 
+    private final Optional<Boolean> multichannel;
+
+    private final Optional<Integer> audioChannels;
+
     private final Optional<Boolean> dualChannel;
 
     private final Optional<String> webhookUrl;
@@ -157,6 +160,8 @@ private Transcript(
             Optional<Boolean> punctuate,
             Optional<Boolean> formatText,
             Optional<Boolean> disfluencies,
+            Optional<Boolean> multichannel,
+            Optional<Integer> audioChannels,
             Optional<Boolean> dualChannel,
             Optional<String> webhookUrl,
             Optional<Integer> webhookStatusCode,
@@ -216,6 +221,8 @@ private Transcript(
         this.punctuate = punctuate;
         this.formatText = formatText;
         this.disfluencies = disfluencies;
+        this.multichannel = multichannel;
+        this.audioChannels = audioChannels;
         this.dualChannel = dualChannel;
         this.webhookUrl = webhookUrl;
         this.webhookStatusCode = webhookStatusCode;
@@ -391,6 +398,22 @@ public Optional<Boolean> getDisfluencies() {
         return disfluencies;
     }
 
+    /**
+     * @return Whether <a href="https://www.assemblyai.com/docs/models/speech-recognition#multichannel-transcription">Multichannel transcription</a> was enabled in the transcription request, either true or false
+     */
+    @JsonProperty("multichannel")
+    public Optional<Boolean> getMultichannel() {
+        return multichannel;
+    }
+
+    /**
+     * @return The number of audio channels in the audio file. This is only present when multichannel is enabled.
+     */
+    @JsonProperty("audio_channels")
+    public Optional<Integer> getAudioChannels() {
+        return audioChannels;
+    }
+
     /**
      * @return Whether <a href="https://www.assemblyai.com/docs/models/speech-recognition#dual-channel-transcription">Dual channel transcription</a> was enabled in the transcription request, either true or false
      */
@@ -751,6 +774,8 @@ private boolean equalTo(Transcript other) {
                 && punctuate.equals(other.punctuate)
                 && formatText.equals(other.formatText)
                 && disfluencies.equals(other.disfluencies)
+                && multichannel.equals(other.multichannel)
+                && audioChannels.equals(other.audioChannels)
                 && dualChannel.equals(other.dualChannel)
                 && webhookUrl.equals(other.webhookUrl)
                 && webhookStatusCode.equals(other.webhookStatusCode)
@@ -814,6 +839,8 @@ public int hashCode() {
                 this.punctuate,
                 this.formatText,
                 this.disfluencies,
+                this.multichannel,
+                this.audioChannels,
                 this.dualChannel,
                 this.webhookUrl,
                 this.webhookStatusCode,
@@ -868,17 +895,17 @@ public static IdStage builder() {
     }
 
     public interface IdStage {
-        AudioUrlStage id(@NotNull String id);
+        AudioUrlStage id(String id);
 
         Builder from(Transcript other);
     }
 
     public interface AudioUrlStage {
-        StatusStage audioUrl(@NotNull String audioUrl);
+        StatusStage audioUrl(String audioUrl);
     }
 
     public interface StatusStage {
-        WebhookAuthStage status(@NotNull TranscriptStatus status);
+        WebhookAuthStage status(TranscriptStatus status);
     }
 
     public interface WebhookAuthStage {
@@ -898,11 +925,11 @@ public interface SummarizationStage {
     }
 
     public interface LanguageModelStage {
-        AcousticModelStage languageModel(@NotNull String languageModel);
+        AcousticModelStage languageModel(String languageModel);
     }
 
     public interface AcousticModelStage {
-        _FinalStage acousticModel(@NotNull String acousticModel);
+        _FinalStage acousticModel(String acousticModel);
     }
 
     public interface _FinalStage {
@@ -960,6 +987,14 @@ public interface _FinalStage {
 
         _FinalStage disfluencies(Boolean disfluencies);
 
+        _FinalStage multichannel(Optional<Boolean> multichannel);
+
+        _FinalStage multichannel(Boolean multichannel);
+
+        _FinalStage audioChannels(Optional<Integer> audioChannels);
+
+        _FinalStage audioChannels(Integer audioChannels);
+
         _FinalStage dualChannel(Optional<Boolean> dualChannel);
 
         _FinalStage dualChannel(Boolean dualChannel);
@@ -1207,6 +1242,10 @@ public static final class Builder
 
         private Optional<Boolean> dualChannel = Optional.empty();
 
+        private Optional<Integer> audioChannels = Optional.empty();
+
+        private Optional<Boolean> multichannel = Optional.empty();
+
         private Optional<Boolean> disfluencies = Optional.empty();
 
         private Optional<Boolean> formatText = Optional.empty();
@@ -1256,6 +1295,8 @@ public Builder from(Transcript other) {
             punctuate(other.getPunctuate());
             formatText(other.getFormatText());
             disfluencies(other.getDisfluencies());
+            multichannel(other.getMultichannel());
+            audioChannels(other.getAudioChannels());
             dualChannel(other.getDualChannel());
             webhookUrl(other.getWebhookUrl());
             webhookStatusCode(other.getWebhookStatusCode());
@@ -1307,8 +1348,8 @@ public Builder from(Transcript other) {
          */
         @java.lang.Override
         @JsonSetter("id")
-        public AudioUrlStage id(@NotNull String id) {
-            this.id = Objects.requireNonNull(id, "id must not be null");
+        public AudioUrlStage id(String id) {
+            this.id = id;
             return this;
         }
 
@@ -1318,8 +1359,8 @@ public AudioUrlStage id(@NotNull String id) {
          */
         @java.lang.Override
         @JsonSetter("audio_url")
-        public StatusStage audioUrl(@NotNull String audioUrl) {
-            this.audioUrl = Objects.requireNonNull(audioUrl, "audioUrl must not be null");
+        public StatusStage audioUrl(String audioUrl) {
+            this.audioUrl = audioUrl;
             return this;
         }
 
@@ -1329,8 +1370,8 @@ public StatusStage audioUrl(@NotNull String audioUrl) {
          */
         @java.lang.Override
         @JsonSetter("status")
-        public WebhookAuthStage status(@NotNull TranscriptStatus status) {
-            this.status = Objects.requireNonNull(status, "status must not be null");
+        public WebhookAuthStage status(TranscriptStatus status) {
+            this.status = status;
             return this;
         }
 
@@ -1384,8 +1425,8 @@ public LanguageModelStage summarization(boolean summarization) {
          */
         @java.lang.Override
         @JsonSetter("language_model")
-        public AcousticModelStage languageModel(@NotNull String languageModel) {
-            this.languageModel = Objects.requireNonNull(languageModel, "languageModel must not be null");
+        public AcousticModelStage languageModel(String languageModel) {
+            this.languageModel = languageModel;
             return this;
         }
 
@@ -1395,8 +1436,8 @@ public AcousticModelStage languageModel(@NotNull String languageModel) {
          */
         @java.lang.Override
         @JsonSetter("acoustic_model")
-        public _FinalStage acousticModel(@NotNull String acousticModel) {
-            this.acousticModel = Objects.requireNonNull(acousticModel, "acousticModel must not be null");
+        public _FinalStage acousticModel(String acousticModel) {
+            this.acousticModel = acousticModel;
             return this;
         }
 
@@ -2004,6 +2045,40 @@ public _FinalStage dualChannel(Optional<Boolean> dualChannel) {
             return this;
         }
 
+        /**
+         * <p>The number of audio channels in the audio file. This is only present when multichannel is enabled.</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
+        @java.lang.Override
+        public _FinalStage audioChannels(Integer audioChannels) {
+            this.audioChannels = Optional.ofNullable(audioChannels);
+            return this;
+        }
+
+        @java.lang.Override
+        @JsonSetter(value = "audio_channels", nulls = Nulls.SKIP)
+        public _FinalStage audioChannels(Optional<Integer> audioChannels) {
+            this.audioChannels = audioChannels;
+            return this;
+        }
+
+        /**
+         * <p>Whether <a href="https://www.assemblyai.com/docs/models/speech-recognition#multichannel-transcription">Multichannel transcription</a> was enabled in the transcription request, either true or false</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
+        @java.lang.Override
+        public _FinalStage multichannel(Boolean multichannel) {
+            this.multichannel = Optional.ofNullable(multichannel);
+            return this;
+        }
+
+        @java.lang.Override
+        @JsonSetter(value = "multichannel", nulls = Nulls.SKIP)
+        public _FinalStage multichannel(Optional<Boolean> multichannel) {
+            this.multichannel = multichannel;
+            return this;
+        }
+
         /**
          * <p>Transcribe Filler Words, like &quot;umm&quot;, in your media file; can be true or false</p>
          * @return Reference to {@code this} so that method calls can be chained together.
@@ -2245,6 +2320,8 @@ public Transcript build() {
                     punctuate,
                     formatText,
                     disfluencies,
+                    multichannel,
+                    audioChannels,
                     dualChannel,
                     webhookUrl,
                     webhookStatusCode,
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptCustomSpelling.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptCustomSpelling.java
index 71d08e1f..78fc5b7b 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptCustomSpelling.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptCustomSpelling.java
@@ -17,7 +17,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = TranscriptCustomSpelling.Builder.class)
@@ -80,7 +79,7 @@ public static ToStage builder() {
     }
 
     public interface ToStage {
-        _FinalStage to(@NotNull String to);
+        _FinalStage to(String to);
 
         Builder from(TranscriptCustomSpelling other);
     }
@@ -119,8 +118,8 @@ public Builder from(TranscriptCustomSpelling other) {
          */
         @java.lang.Override
         @JsonSetter("to")
-        public _FinalStage to(@NotNull String to) {
-            this.to = Objects.requireNonNull(to, "to must not be null");
+        public _FinalStage to(String to) {
+            this.to = to;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptList.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptList.java
index a1f9f84f..c6698452 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptList.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptList.java
@@ -17,7 +17,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = TranscriptList.Builder.class)
@@ -35,11 +34,17 @@ private TranscriptList(
         this.additionalProperties = additionalProperties;
     }
 
+    /**
+     * @return Details of the transcript page
+     */
     @JsonProperty("page_details")
     public PageDetails getPageDetails() {
         return pageDetails;
     }
 
+    /**
+     * @return An array of transcripts
+     */
     @JsonProperty("transcripts")
     public List<TranscriptListItem> getTranscripts() {
         return transcripts;
@@ -75,7 +80,7 @@ public static PageDetailsStage builder() {
     }
 
     public interface PageDetailsStage {
-        _FinalStage pageDetails(@NotNull PageDetails pageDetails);
+        _FinalStage pageDetails(PageDetails pageDetails);
 
         Builder from(TranscriptList other);
     }
@@ -108,19 +113,31 @@ public Builder from(TranscriptList other) {
             return this;
         }
 
+        /**
+         * <p>Details of the transcript page</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("page_details")
-        public _FinalStage pageDetails(@NotNull PageDetails pageDetails) {
-            this.pageDetails = Objects.requireNonNull(pageDetails, "pageDetails must not be null");
+        public _FinalStage pageDetails(PageDetails pageDetails) {
+            this.pageDetails = pageDetails;
             return this;
         }
 
+        /**
+         * <p>An array of transcripts</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         public _FinalStage addAllTranscripts(List<TranscriptListItem> transcripts) {
             this.transcripts.addAll(transcripts);
             return this;
         }
 
+        /**
+         * <p>An array of transcripts</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         public _FinalStage addTranscripts(TranscriptListItem transcripts) {
             this.transcripts.add(transcripts);
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptListItem.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptListItem.java
index 6cf42e21..4880a6f2 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptListItem.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptListItem.java
@@ -17,7 +17,6 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = TranscriptListItem.Builder.class)
@@ -57,31 +56,49 @@ private TranscriptListItem(
         this.additionalProperties = additionalProperties;
     }
 
+    /**
+     * @return The unique identifier for the transcript
+     */
     @JsonProperty("id")
     public String getId() {
         return id;
     }
 
+    /**
+     * @return The URL to retrieve the transcript
+     */
     @JsonProperty("resource_url")
     public String getResourceUrl() {
         return resourceUrl;
     }
 
+    /**
+     * @return The status of the transcript
+     */
     @JsonProperty("status")
     public TranscriptStatus getStatus() {
         return status;
     }
 
+    /**
+     * @return The date and time the transcript was created
+     */
     @JsonProperty("created")
     public OffsetDateTime getCreated() {
         return created;
     }
 
+    /**
+     * @return The date and time the transcript was completed
+     */
     @JsonProperty("completed")
     public Optional<OffsetDateTime> getCompleted() {
         return completed;
     }
 
+    /**
+     * @return The URL to the audio file
+     */
     @JsonProperty("audio_url")
     public String getAudioUrl() {
         return audioUrl;
@@ -132,25 +149,25 @@ public static IdStage builder() {
     }
 
     public interface IdStage {
-        ResourceUrlStage id(@NotNull String id);
+        ResourceUrlStage id(String id);
 
         Builder from(TranscriptListItem other);
     }
 
     public interface ResourceUrlStage {
-        StatusStage resourceUrl(@NotNull String resourceUrl);
+        StatusStage resourceUrl(String resourceUrl);
     }
 
     public interface StatusStage {
-        CreatedStage status(@NotNull TranscriptStatus status);
+        CreatedStage status(TranscriptStatus status);
     }
 
     public interface CreatedStage {
-        AudioUrlStage created(@NotNull OffsetDateTime created);
+        AudioUrlStage created(OffsetDateTime created);
     }
 
     public interface AudioUrlStage {
-        _FinalStage audioUrl(@NotNull String audioUrl);
+        _FinalStage audioUrl(String audioUrl);
     }
 
     public interface _FinalStage {
@@ -199,38 +216,58 @@ public Builder from(TranscriptListItem other) {
             return this;
         }
 
+        /**
+         * <p>The unique identifier for the transcript</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("id")
-        public ResourceUrlStage id(@NotNull String id) {
-            this.id = Objects.requireNonNull(id, "id must not be null");
+        public ResourceUrlStage id(String id) {
+            this.id = id;
             return this;
         }
 
+        /**
+         * <p>The URL to retrieve the transcript</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("resource_url")
-        public StatusStage resourceUrl(@NotNull String resourceUrl) {
-            this.resourceUrl = Objects.requireNonNull(resourceUrl, "resourceUrl must not be null");
+        public StatusStage resourceUrl(String resourceUrl) {
+            this.resourceUrl = resourceUrl;
             return this;
         }
 
+        /**
+         * <p>The status of the transcript</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("status")
-        public CreatedStage status(@NotNull TranscriptStatus status) {
-            this.status = Objects.requireNonNull(status, "status must not be null");
+        public CreatedStage status(TranscriptStatus status) {
+            this.status = status;
             return this;
         }
 
+        /**
+         * <p>The date and time the transcript was created</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("created")
-        public AudioUrlStage created(@NotNull OffsetDateTime created) {
-            this.created = Objects.requireNonNull(created, "created must not be null");
+        public AudioUrlStage created(OffsetDateTime created) {
+            this.created = created;
             return this;
         }
 
+        /**
+         * <p>The URL to the audio file</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("audio_url")
-        public _FinalStage audioUrl(@NotNull String audioUrl) {
-            this.audioUrl = Objects.requireNonNull(audioUrl, "audioUrl must not be null");
+        public _FinalStage audioUrl(String audioUrl) {
+            this.audioUrl = audioUrl;
             return this;
         }
 
@@ -251,6 +288,10 @@ public _FinalStage error(Optional<String> error) {
             return this;
         }
 
+        /**
+         * <p>The date and time the transcript was completed</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         public _FinalStage completed(OffsetDateTime completed) {
             this.completed = Optional.ofNullable(completed);
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptOptionalParams.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptOptionalParams.java
index bd2f691b..fc66ec91 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptOptionalParams.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptOptionalParams.java
@@ -35,6 +35,8 @@ public final class TranscriptOptionalParams implements ITranscriptOptionalParams
 
     private final Optional<Boolean> disfluencies;
 
+    private final Optional<Boolean> multichannel;
+
     private final Optional<Boolean> dualChannel;
 
     private final Optional<String> webhookUrl;
@@ -105,6 +107,7 @@ private TranscriptOptionalParams(
             Optional<Boolean> punctuate,
             Optional<Boolean> formatText,
             Optional<Boolean> disfluencies,
+            Optional<Boolean> multichannel,
             Optional<Boolean> dualChannel,
             Optional<String> webhookUrl,
             Optional<String> webhookAuthHeaderName,
@@ -143,6 +146,7 @@ private TranscriptOptionalParams(
         this.punctuate = punctuate;
         this.formatText = formatText;
         this.disfluencies = disfluencies;
+        this.multichannel = multichannel;
         this.dualChannel = dualChannel;
         this.webhookUrl = webhookUrl;
         this.webhookAuthHeaderName = webhookAuthHeaderName;
@@ -235,6 +239,15 @@ public Optional<Boolean> getDisfluencies() {
         return disfluencies;
     }
 
+    /**
+     * @return Enable <a href="https://www.assemblyai.com/docs/models/speech-recognition#multichannel-transcription">Multichannel</a> transcription, can be true or false.
+     */
+    @JsonProperty("multichannel")
+    @java.lang.Override
+    public Optional<Boolean> getMultichannel() {
+        return multichannel;
+    }
+
     /**
      * @return Enable <a href="https://www.assemblyai.com/docs/models/speech-recognition#dual-channel-transcription">Dual Channel</a> transcription, can be true or false.
      */
@@ -524,6 +537,7 @@ private boolean equalTo(TranscriptOptionalParams other) {
                 && punctuate.equals(other.punctuate)
                 && formatText.equals(other.formatText)
                 && disfluencies.equals(other.disfluencies)
+                && multichannel.equals(other.multichannel)
                 && dualChannel.equals(other.dualChannel)
                 && webhookUrl.equals(other.webhookUrl)
                 && webhookAuthHeaderName.equals(other.webhookAuthHeaderName)
@@ -566,6 +580,7 @@ public int hashCode() {
                 this.punctuate,
                 this.formatText,
                 this.disfluencies,
+                this.multichannel,
                 this.dualChannel,
                 this.webhookUrl,
                 this.webhookAuthHeaderName,
@@ -623,6 +638,8 @@ public static final class Builder {
 
         private Optional<Boolean> disfluencies = Optional.empty();
 
+        private Optional<Boolean> multichannel = Optional.empty();
+
         private Optional<Boolean> dualChannel = Optional.empty();
 
         private Optional<String> webhookUrl = Optional.empty();
@@ -696,6 +713,7 @@ public Builder from(TranscriptOptionalParams other) {
             punctuate(other.getPunctuate());
             formatText(other.getFormatText());
             disfluencies(other.getDisfluencies());
+            multichannel(other.getMultichannel());
             dualChannel(other.getDualChannel());
             webhookUrl(other.getWebhookUrl());
             webhookAuthHeaderName(other.getWebhookAuthHeaderName());
@@ -806,6 +824,17 @@ public Builder disfluencies(Boolean disfluencies) {
             return this;
         }
 
+        @JsonSetter(value = "multichannel", nulls = Nulls.SKIP)
+        public Builder multichannel(Optional<Boolean> multichannel) {
+            this.multichannel = multichannel;
+            return this;
+        }
+
+        public Builder multichannel(Boolean multichannel) {
+            this.multichannel = Optional.ofNullable(multichannel);
+            return this;
+        }
+
         @JsonSetter(value = "dual_channel", nulls = Nulls.SKIP)
         public Builder dualChannel(Optional<Boolean> dualChannel) {
             this.dualChannel = dualChannel;
@@ -1145,6 +1174,7 @@ public TranscriptOptionalParams build() {
                     punctuate,
                     formatText,
                     disfluencies,
+                    multichannel,
                     dualChannel,
                     webhookUrl,
                     webhookAuthHeaderName,
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptParagraph.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptParagraph.java
index 4e32ce73..00d50dd8 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptParagraph.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptParagraph.java
@@ -17,8 +17,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import java.util.Optional;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = TranscriptParagraph.Builder.class)
@@ -33,8 +31,6 @@ public final class TranscriptParagraph {
 
     private final List<TranscriptWord> words;
 
-    private final Optional<String> speaker;
-
     private final Map<String, Object> additionalProperties;
 
     private TranscriptParagraph(
@@ -43,50 +39,55 @@ private TranscriptParagraph(
             int end,
             double confidence,
             List<TranscriptWord> words,
-            Optional<String> speaker,
             Map<String, Object> additionalProperties) {
         this.text = text;
         this.start = start;
         this.end = end;
         this.confidence = confidence;
         this.words = words;
-        this.speaker = speaker;
         this.additionalProperties = additionalProperties;
     }
 
+    /**
+     * @return The transcript of the paragraph
+     */
     @JsonProperty("text")
     public String getText() {
         return text;
     }
 
+    /**
+     * @return The starting time, in milliseconds, of the paragraph
+     */
     @JsonProperty("start")
     public int getStart() {
         return start;
     }
 
+    /**
+     * @return The ending time, in milliseconds, of the paragraph
+     */
     @JsonProperty("end")
     public int getEnd() {
         return end;
     }
 
+    /**
+     * @return The confidence score for the transcript of this paragraph
+     */
     @JsonProperty("confidence")
     public double getConfidence() {
         return confidence;
     }
 
+    /**
+     * @return An array of words in the paragraph
+     */
     @JsonProperty("words")
     public List<TranscriptWord> getWords() {
         return words;
     }
 
-    /**
-     * @return The speaker of the sentence if <a href="https://www.assemblyai.com/docs/models/speaker-diarization">Speaker Diarization</a> is enabled, else null
-     */
-    @JsonProperty("speaker")
-    public Optional<String> getSpeaker() {
-        return speaker;
-    }
-
     @java.lang.Override
     public boolean equals(Object other) {
         if (this == other) return true;
@@ -103,13 +104,12 @@ private boolean equalTo(TranscriptParagraph other) {
                 && start == other.start
                 && end == other.end
                 && confidence == other.confidence
-                && words.equals(other.words)
-                && speaker.equals(other.speaker);
+                && words.equals(other.words);
     }
 
     @java.lang.Override
     public int hashCode() {
-        return Objects.hash(this.text, this.start, this.end, this.confidence, this.words, this.speaker);
+        return Objects.hash(this.text, this.start, this.end, this.confidence, this.words);
     }
 
     @java.lang.Override
@@ -122,7 +122,7 @@ public static TextStage builder() {
     }
 
     public interface TextStage {
-        StartStage text(@NotNull String text);
+        StartStage text(String text);
 
         Builder from(TranscriptParagraph other);
     }
@@ -147,10 +147,6 @@ public interface _FinalStage {
         _FinalStage addWords(TranscriptWord words);
 
         _FinalStage addAllWords(List<TranscriptWord> words);
-
-        _FinalStage speaker(Optional<String> speaker);
-
-        _FinalStage speaker(String speaker);
     }
 
     @JsonIgnoreProperties(ignoreUnknown = true)
@@ -163,8 +159,6 @@ public static final class Builder implements TextStage, StartStage, EndStage, Co
 
         private double confidence;
 
-        private Optional<String> speaker = Optional.empty();
-
         private List<TranscriptWord> words = new ArrayList<>();
 
         @JsonAnySetter
@@ -179,17 +173,24 @@ public Builder from(TranscriptParagraph other) {
             end(other.getEnd());
             confidence(other.getConfidence());
             words(other.getWords());
-            speaker(other.getSpeaker());
             return this;
         }
 
+        /**
+         * <p>The transcript of the paragraph</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("text")
-        public StartStage text(@NotNull String text) {
-            this.text = Objects.requireNonNull(text, "text must not be null");
+        public StartStage text(String text) {
+            this.text = text;
             return this;
         }
 
+        /**
+         * <p>The starting time, in milliseconds, of the paragraph</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("start")
         public EndStage start(int start) {
@@ -197,6 +198,10 @@ public EndStage start(int start) {
             return this;
         }
 
+        /**
+         * <p>The ending time, in milliseconds, of the paragraph</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("end")
         public ConfidenceStage end(int end) {
@@ -204,6 +209,10 @@ public ConfidenceStage end(int end) {
             return this;
         }
 
+        /**
+         * <p>The confidence score for the transcript of this paragraph</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("confidence")
         public _FinalStage confidence(double confidence) {
@@ -212,28 +221,19 @@ public _FinalStage confidence(double confidence) {
         }
 
         /**
-         * <p>The speaker of the sentence if <a href="https://www.assemblyai.com/docs/models/speaker-diarization">Speaker Diarization</a> is enabled, else null</p>
+         * <p>An array of words in the paragraph</p>
          * @return Reference to {@code this} so that method calls can be chained together.
          */
-        @java.lang.Override
-        public _FinalStage speaker(String speaker) {
-            this.speaker = Optional.ofNullable(speaker);
-            return this;
-        }
-
-        @java.lang.Override
-        @JsonSetter(value = "speaker", nulls = Nulls.SKIP)
-        public _FinalStage speaker(Optional<String> speaker) {
-            this.speaker = speaker;
-            return this;
-        }
-
         @java.lang.Override
         public _FinalStage addAllWords(List<TranscriptWord> words) {
             this.words.addAll(words);
             return this;
         }
 
+        /**
+         * <p>An array of words in the paragraph</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         public _FinalStage addWords(TranscriptWord words) {
             this.words.add(words);
@@ -250,7 +250,7 @@ public _FinalStage words(List<TranscriptWord> words) {
 
         @java.lang.Override
         public TranscriptParagraph build() {
-            return new TranscriptParagraph(text, start, end, confidence, words, speaker, additionalProperties);
+            return new TranscriptParagraph(text, start, end, confidence, words, additionalProperties);
         }
     }
 }
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptReadyNotification.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptReadyNotification.java
index 772c8d07..dc87ec8f 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptReadyNotification.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptReadyNotification.java
@@ -14,7 +14,6 @@
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = TranscriptReadyNotification.Builder.class)
@@ -78,13 +77,13 @@ public static TranscriptIdStage builder() {
     }
 
     public interface TranscriptIdStage {
-        StatusStage transcriptId(@NotNull String transcriptId);
+        StatusStage transcriptId(String transcriptId);
 
         Builder from(TranscriptReadyNotification other);
     }
 
     public interface StatusStage {
-        _FinalStage status(@NotNull TranscriptReadyStatus status);
+        _FinalStage status(TranscriptReadyStatus status);
     }
 
     public interface _FinalStage {
@@ -115,8 +114,8 @@ public Builder from(TranscriptReadyNotification other) {
          */
         @java.lang.Override
         @JsonSetter("transcript_id")
-        public StatusStage transcriptId(@NotNull String transcriptId) {
-            this.transcriptId = Objects.requireNonNull(transcriptId, "transcriptId must not be null");
+        public StatusStage transcriptId(String transcriptId) {
+            this.transcriptId = transcriptId;
             return this;
         }
 
@@ -126,8 +125,8 @@ public StatusStage transcriptId(@NotNull String transcriptId) {
          */
         @java.lang.Override
         @JsonSetter("status")
-        public _FinalStage status(@NotNull TranscriptReadyStatus status) {
-            this.status = Objects.requireNonNull(status, "status must not be null");
+        public _FinalStage status(TranscriptReadyStatus status) {
+            this.status = status;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptSentence.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptSentence.java
index b9fca84c..1dc110de 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptSentence.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptSentence.java
@@ -18,7 +18,6 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = TranscriptSentence.Builder.class)
@@ -33,6 +32,8 @@ public final class TranscriptSentence {
 
     private final List<TranscriptWord> words;
 
+    private final Optional<String> channel;
+
     private final Optional<String> speaker;
 
     private final Map<String, Object> additionalProperties;
@@ -43,6 +44,7 @@ private TranscriptSentence(
             int end,
             double confidence,
             List<TranscriptWord> words,
+            Optional<String> channel,
             Optional<String> speaker,
             Map<String, Object> additionalProperties) {
         this.text = text;
@@ -50,35 +52,59 @@ private TranscriptSentence(
         this.end = end;
         this.confidence = confidence;
         this.words = words;
+        this.channel = channel;
         this.speaker = speaker;
         this.additionalProperties = additionalProperties;
     }
 
+    /**
+     * @return The transcript of the sentence
+     */
     @JsonProperty("text")
     public String getText() {
         return text;
     }
 
+    /**
+     * @return The starting time, in milliseconds, for the sentence
+     */
     @JsonProperty("start")
     public int getStart() {
         return start;
     }
 
+    /**
+     * @return The ending time, in milliseconds, for the sentence
+     */
     @JsonProperty("end")
     public int getEnd() {
         return end;
     }
 
+    /**
+     * @return The confidence score for the transcript of this sentence
+     */
     @JsonProperty("confidence")
     public double getConfidence() {
         return confidence;
     }
 
+    /**
+     * @return An array of words in the sentence
+     */
     @JsonProperty("words")
     public List<TranscriptWord> getWords() {
         return words;
     }
 
+    /**
+     * @return The channel of the sentence. The left and right channels are channels 1 and 2. Additional channels increment the channel number sequentially.
+     */
+    @JsonProperty("channel")
+    public Optional<String> getChannel() {
+        return channel;
+    }
+
     /**
      * @return The speaker of the sentence if <a href="https://www.assemblyai.com/docs/models/speaker-diarization">Speaker Diarization</a> is enabled, else null
      */
@@ -104,12 +130,13 @@ private boolean equalTo(TranscriptSentence other) {
                 && end == other.end
                 && confidence == other.confidence
                 && words.equals(other.words)
+                && channel.equals(other.channel)
                 && speaker.equals(other.speaker);
     }
 
     @java.lang.Override
     public int hashCode() {
-        return Objects.hash(this.text, this.start, this.end, this.confidence, this.words, this.speaker);
+        return Objects.hash(this.text, this.start, this.end, this.confidence, this.words, this.channel, this.speaker);
     }
 
     @java.lang.Override
@@ -122,7 +149,7 @@ public static TextStage builder() {
     }
 
     public interface TextStage {
-        StartStage text(@NotNull String text);
+        StartStage text(String text);
 
         Builder from(TranscriptSentence other);
     }
@@ -148,6 +175,10 @@ public interface _FinalStage {
 
         _FinalStage addAllWords(List<TranscriptWord> words);
 
+        _FinalStage channel(Optional<String> channel);
+
+        _FinalStage channel(String channel);
+
         _FinalStage speaker(Optional<String> speaker);
 
         _FinalStage speaker(String speaker);
@@ -165,6 +196,8 @@ public static final class Builder implements TextStage, StartStage, EndStage, Co
 
         private Optional<String> speaker = Optional.empty();
 
+        private Optional<String> channel = Optional.empty();
+
         private List<TranscriptWord> words = new ArrayList<>();
 
         @JsonAnySetter
@@ -179,17 +212,26 @@ public Builder from(TranscriptSentence other) {
             end(other.getEnd());
             confidence(other.getConfidence());
             words(other.getWords());
+            channel(other.getChannel());
             speaker(other.getSpeaker());
             return this;
         }
 
+        /**
+         * <p>The transcript of the sentence</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("text")
-        public StartStage text(@NotNull String text) {
-            this.text = Objects.requireNonNull(text, "text must not be null");
+        public StartStage text(String text) {
+            this.text = text;
             return this;
         }
 
+        /**
+         * <p>The starting time, in milliseconds, for the sentence</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("start")
         public EndStage start(int start) {
@@ -197,6 +239,10 @@ public EndStage start(int start) {
             return this;
         }
 
+        /**
+         * <p>The ending time, in milliseconds, for the sentence</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("end")
         public ConfidenceStage end(int end) {
@@ -204,6 +250,10 @@ public ConfidenceStage end(int end) {
             return this;
         }
 
+        /**
+         * <p>The confidence score for the transcript of this sentence</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("confidence")
         public _FinalStage confidence(double confidence) {
@@ -228,12 +278,37 @@ public _FinalStage speaker(Optional<String> speaker) {
             return this;
         }
 
+        /**
+         * <p>The channel of the sentence. The left and right channels are channels 1 and 2. Additional channels increment the channel number sequentially.</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
+        @java.lang.Override
+        public _FinalStage channel(String channel) {
+            this.channel = Optional.ofNullable(channel);
+            return this;
+        }
+
+        @java.lang.Override
+        @JsonSetter(value = "channel", nulls = Nulls.SKIP)
+        public _FinalStage channel(Optional<String> channel) {
+            this.channel = channel;
+            return this;
+        }
+
+        /**
+         * <p>An array of words in the sentence</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         public _FinalStage addAllWords(List<TranscriptWord> words) {
             this.words.addAll(words);
             return this;
         }
 
+        /**
+         * <p>An array of words in the sentence</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         public _FinalStage addWords(TranscriptWord words) {
             this.words.add(words);
@@ -250,7 +325,7 @@ public _FinalStage words(List<TranscriptWord> words) {
 
         @java.lang.Override
         public TranscriptSentence build() {
-            return new TranscriptSentence(text, start, end, confidence, words, speaker, additionalProperties);
+            return new TranscriptSentence(text, start, end, confidence, words, channel, speaker, additionalProperties);
         }
     }
 }
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptUtterance.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptUtterance.java
index fe1153a9..585de323 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptUtterance.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptUtterance.java
@@ -17,7 +17,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
+import java.util.Optional;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = TranscriptUtterance.Builder.class)
@@ -32,6 +32,8 @@ public final class TranscriptUtterance {
 
     private final List<TranscriptWord> words;
 
+    private final Optional<String> channel;
+
     private final String speaker;
 
     private final Map<String, Object> additionalProperties;
@@ -42,6 +44,7 @@ private TranscriptUtterance(
             int end,
             String text,
             List<TranscriptWord> words,
+            Optional<String> channel,
             String speaker,
             Map<String, Object> additionalProperties) {
         this.confidence = confidence;
@@ -49,6 +52,7 @@ private TranscriptUtterance(
         this.end = end;
         this.text = text;
         this.words = words;
+        this.channel = channel;
         this.speaker = speaker;
         this.additionalProperties = additionalProperties;
     }
@@ -93,6 +97,14 @@ public List<TranscriptWord> getWords() {
         return words;
     }
 
+    /**
+     * @return The channel of this utterance. The left and right channels are channels 1 and 2. Additional channels increment the channel number sequentially.
+     */
+    @JsonProperty("channel")
+    public Optional<String> getChannel() {
+        return channel;
+    }
+
     /**
      * @return The speaker of this utterance, where each speaker is assigned a sequential capital letter - e.g. &quot;A&quot; for Speaker A, &quot;B&quot; for Speaker B, etc.
      */
@@ -118,12 +130,13 @@ private boolean equalTo(TranscriptUtterance other) {
                 && end == other.end
                 && text.equals(other.text)
                 && words.equals(other.words)
+                && channel.equals(other.channel)
                 && speaker.equals(other.speaker);
     }
 
     @java.lang.Override
     public int hashCode() {
-        return Objects.hash(this.confidence, this.start, this.end, this.text, this.words, this.speaker);
+        return Objects.hash(this.confidence, this.start, this.end, this.text, this.words, this.channel, this.speaker);
     }
 
     @java.lang.Override
@@ -150,11 +163,11 @@ public interface EndStage {
     }
 
     public interface TextStage {
-        SpeakerStage text(@NotNull String text);
+        SpeakerStage text(String text);
     }
 
     public interface SpeakerStage {
-        _FinalStage speaker(@NotNull String speaker);
+        _FinalStage speaker(String speaker);
     }
 
     public interface _FinalStage {
@@ -165,6 +178,10 @@ public interface _FinalStage {
         _FinalStage addWords(TranscriptWord words);
 
         _FinalStage addAllWords(List<TranscriptWord> words);
+
+        _FinalStage channel(Optional<String> channel);
+
+        _FinalStage channel(String channel);
     }
 
     @JsonIgnoreProperties(ignoreUnknown = true)
@@ -180,6 +197,8 @@ public static final class Builder
 
         private String speaker;
 
+        private Optional<String> channel = Optional.empty();
+
         private List<TranscriptWord> words = new ArrayList<>();
 
         @JsonAnySetter
@@ -194,6 +213,7 @@ public Builder from(TranscriptUtterance other) {
             end(other.getEnd());
             text(other.getText());
             words(other.getWords());
+            channel(other.getChannel());
             speaker(other.getSpeaker());
             return this;
         }
@@ -237,8 +257,8 @@ public TextStage end(int end) {
          */
         @java.lang.Override
         @JsonSetter("text")
-        public SpeakerStage text(@NotNull String text) {
-            this.text = Objects.requireNonNull(text, "text must not be null");
+        public SpeakerStage text(String text) {
+            this.text = text;
             return this;
         }
 
@@ -248,8 +268,25 @@ public SpeakerStage text(@NotNull String text) {
          */
         @java.lang.Override
         @JsonSetter("speaker")
-        public _FinalStage speaker(@NotNull String speaker) {
-            this.speaker = Objects.requireNonNull(speaker, "speaker must not be null");
+        public _FinalStage speaker(String speaker) {
+            this.speaker = speaker;
+            return this;
+        }
+
+        /**
+         * <p>The channel of this utterance. The left and right channels are channels 1 and 2. Additional channels increment the channel number sequentially.</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
+        @java.lang.Override
+        public _FinalStage channel(String channel) {
+            this.channel = Optional.ofNullable(channel);
+            return this;
+        }
+
+        @java.lang.Override
+        @JsonSetter(value = "channel", nulls = Nulls.SKIP)
+        public _FinalStage channel(Optional<String> channel) {
+            this.channel = channel;
             return this;
         }
 
@@ -283,7 +320,7 @@ public _FinalStage words(List<TranscriptWord> words) {
 
         @java.lang.Override
         public TranscriptUtterance build() {
-            return new TranscriptUtterance(confidence, start, end, text, words, speaker, additionalProperties);
+            return new TranscriptUtterance(confidence, start, end, text, words, channel, speaker, additionalProperties);
         }
     }
 }
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptWord.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptWord.java
index 33796ddc..1a5c0eaa 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptWord.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/TranscriptWord.java
@@ -16,7 +16,6 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = TranscriptWord.Builder.class)
@@ -29,6 +28,8 @@ public final class TranscriptWord {
 
     private final String text;
 
+    private final Optional<String> channel;
+
     private final Optional<String> speaker;
 
     private final Map<String, Object> additionalProperties;
@@ -38,38 +39,60 @@ private TranscriptWord(
             int start,
             int end,
             String text,
+            Optional<String> channel,
             Optional<String> speaker,
             Map<String, Object> additionalProperties) {
         this.confidence = confidence;
         this.start = start;
         this.end = end;
         this.text = text;
+        this.channel = channel;
         this.speaker = speaker;
         this.additionalProperties = additionalProperties;
     }
 
+    /**
+     * @return The confidence score for the transcript of this word
+     */
     @JsonProperty("confidence")
     public double getConfidence() {
         return confidence;
     }
 
+    /**
+     * @return The starting time, in milliseconds, for the word
+     */
     @JsonProperty("start")
     public int getStart() {
         return start;
     }
 
+    /**
+     * @return The ending time, in milliseconds, for the word
+     */
     @JsonProperty("end")
     public int getEnd() {
         return end;
     }
 
+    /**
+     * @return The text of the word
+     */
     @JsonProperty("text")
     public String getText() {
         return text;
     }
 
     /**
-     * @return The speaker of the sentence if <a href="https://www.assemblyai.com/docs/models/speaker-diarization">Speaker Diarization</a> is enabled, else null
+     * @return The channel of the word. The left and right channels are channels 1 and 2. Additional channels increment the channel number sequentially.
+     */
+    @JsonProperty("channel")
+    public Optional<String> getChannel() {
+        return channel;
+    }
+
+    /**
+     * @return The speaker of the word if <a href="https://www.assemblyai.com/docs/models/speaker-diarization">Speaker Diarization</a> is enabled, else null
      */
     @JsonProperty("speaker")
     public Optional<String> getSpeaker() {
@@ -92,12 +115,13 @@ private boolean equalTo(TranscriptWord other) {
                 && start == other.start
                 && end == other.end
                 && text.equals(other.text)
+                && channel.equals(other.channel)
                 && speaker.equals(other.speaker);
     }
 
     @java.lang.Override
     public int hashCode() {
-        return Objects.hash(this.confidence, this.start, this.end, this.text, this.speaker);
+        return Objects.hash(this.confidence, this.start, this.end, this.text, this.channel, this.speaker);
     }
 
     @java.lang.Override
@@ -124,12 +148,16 @@ public interface EndStage {
     }
 
     public interface TextStage {
-        _FinalStage text(@NotNull String text);
+        _FinalStage text(String text);
     }
 
     public interface _FinalStage {
         TranscriptWord build();
 
+        _FinalStage channel(Optional<String> channel);
+
+        _FinalStage channel(String channel);
+
         _FinalStage speaker(Optional<String> speaker);
 
         _FinalStage speaker(String speaker);
@@ -147,6 +175,8 @@ public static final class Builder implements ConfidenceStage, StartStage, EndSta
 
         private Optional<String> speaker = Optional.empty();
 
+        private Optional<String> channel = Optional.empty();
+
         @JsonAnySetter
         private Map<String, Object> additionalProperties = new HashMap<>();
 
@@ -158,10 +188,15 @@ public Builder from(TranscriptWord other) {
             start(other.getStart());
             end(other.getEnd());
             text(other.getText());
+            channel(other.getChannel());
             speaker(other.getSpeaker());
             return this;
         }
 
+        /**
+         * <p>The confidence score for the transcript of this word</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("confidence")
         public StartStage confidence(double confidence) {
@@ -169,6 +204,10 @@ public StartStage confidence(double confidence) {
             return this;
         }
 
+        /**
+         * <p>The starting time, in milliseconds, for the word</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("start")
         public EndStage start(int start) {
@@ -176,6 +215,10 @@ public EndStage start(int start) {
             return this;
         }
 
+        /**
+         * <p>The ending time, in milliseconds, for the word</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("end")
         public TextStage end(int end) {
@@ -183,15 +226,19 @@ public TextStage end(int end) {
             return this;
         }
 
+        /**
+         * <p>The text of the word</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
         @java.lang.Override
         @JsonSetter("text")
-        public _FinalStage text(@NotNull String text) {
-            this.text = Objects.requireNonNull(text, "text must not be null");
+        public _FinalStage text(String text) {
+            this.text = text;
             return this;
         }
 
         /**
-         * <p>The speaker of the sentence if <a href="https://www.assemblyai.com/docs/models/speaker-diarization">Speaker Diarization</a> is enabled, else null</p>
+         * <p>The speaker of the word if <a href="https://www.assemblyai.com/docs/models/speaker-diarization">Speaker Diarization</a> is enabled, else null</p>
          * @return Reference to {@code this} so that method calls can be chained together.
          */
         @java.lang.Override
@@ -207,9 +254,26 @@ public _FinalStage speaker(Optional<String> speaker) {
             return this;
         }
 
+        /**
+         * <p>The channel of the word. The left and right channels are channels 1 and 2. Additional channels increment the channel number sequentially.</p>
+         * @return Reference to {@code this} so that method calls can be chained together.
+         */
+        @java.lang.Override
+        public _FinalStage channel(String channel) {
+            this.channel = Optional.ofNullable(channel);
+            return this;
+        }
+
+        @java.lang.Override
+        @JsonSetter(value = "channel", nulls = Nulls.SKIP)
+        public _FinalStage channel(Optional<String> channel) {
+            this.channel = channel;
+            return this;
+        }
+
         @java.lang.Override
         public TranscriptWord build() {
-            return new TranscriptWord(confidence, start, end, text, speaker, additionalProperties);
+            return new TranscriptWord(confidence, start, end, text, channel, speaker, additionalProperties);
         }
     }
 }
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/WordSearchMatch.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/WordSearchMatch.java
index c6146fae..d158dfce 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/WordSearchMatch.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/WordSearchMatch.java
@@ -17,7 +17,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = WordSearchMatch.Builder.class)
@@ -110,7 +109,7 @@ public static TextStage builder() {
     }
 
     public interface TextStage {
-        CountStage text(@NotNull String text);
+        CountStage text(String text);
 
         Builder from(WordSearchMatch other);
     }
@@ -165,8 +164,8 @@ public Builder from(WordSearchMatch other) {
          */
         @java.lang.Override
         @JsonSetter("text")
-        public CountStage text(@NotNull String text) {
-            this.text = Objects.requireNonNull(text, "text must not be null");
+        public CountStage text(String text) {
+            this.text = text;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/resources/transcripts/types/WordSearchResponse.java b/src/main/java/com/assemblyai/api/resources/transcripts/types/WordSearchResponse.java
index a5cbb640..208692ba 100644
--- a/src/main/java/com/assemblyai/api/resources/transcripts/types/WordSearchResponse.java
+++ b/src/main/java/com/assemblyai/api/resources/transcripts/types/WordSearchResponse.java
@@ -17,7 +17,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = WordSearchResponse.Builder.class)
@@ -92,7 +91,7 @@ public static IdStage builder() {
     }
 
     public interface IdStage {
-        TotalCountStage id(@NotNull String id);
+        TotalCountStage id(String id);
 
         Builder from(WordSearchResponse other);
     }
@@ -138,8 +137,8 @@ public Builder from(WordSearchResponse other) {
          */
         @java.lang.Override
         @JsonSetter("id")
-        public TotalCountStage id(@NotNull String id) {
-            this.id = Objects.requireNonNull(id, "id must not be null");
+        public TotalCountStage id(String id) {
+            this.id = id;
             return this;
         }
 
diff --git a/src/main/java/com/assemblyai/api/types/Error.java b/src/main/java/com/assemblyai/api/types/Error.java
index 8cab22ed..626e8a08 100644
--- a/src/main/java/com/assemblyai/api/types/Error.java
+++ b/src/main/java/com/assemblyai/api/types/Error.java
@@ -16,7 +16,6 @@
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
-import org.jetbrains.annotations.NotNull;
 
 @JsonInclude(JsonInclude.Include.NON_ABSENT)
 @JsonDeserialize(builder = Error.Builder.class)
@@ -76,7 +75,7 @@ public static ErrorStage builder() {
     }
 
     public interface ErrorStage {
-        _FinalStage error(@NotNull String error);
+        _FinalStage error(String error);
 
         Builder from(Error other);
     }
@@ -113,8 +112,8 @@ public Builder from(Error other) {
          */
         @java.lang.Override
         @JsonSetter("error")
-        public _FinalStage error(@NotNull String error) {
-            this.error = Objects.requireNonNull(error, "error must not be null");
+        public _FinalStage error(String error) {
+            this.error = error;
             return this;
         }