diff --git a/CHANGELOG.md b/CHANGELOG.md
index a312964..1502c1a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -204,4 +204,14 @@
   - Retrieve message
   - Retrieve message file
   - Modify message
+- Run
+  - Create a run.
+  - Create a thread and run it in one request.
+  - List runs
+  - List run steps
+  - Retrieves a run.
+  - Retrieve run step
+  - Modifies a run.
+  - Submit tool outputs to run
+  - Cancel a run
   
\ No newline at end of file
diff --git a/lib/chat_gpt_sdk.dart b/lib/chat_gpt_sdk.dart
index 60cb433..27ebd43 100644
--- a/lib/chat_gpt_sdk.dart
+++ b/lib/chat_gpt_sdk.dart
@@ -56,3 +56,10 @@ export 'src/model/assistant/response/tool.dart';
 export 'src/model/thread/request/thread_request.dart';
 export 'src/model/thread/response/thread_delete_response.dart';
 export 'src/model/thread/response/thread_response.dart';
+export 'src/model/message/request/create_message.dart';
+export 'src/model/message/response/content.dart';
+export 'src/model/message/response/create_message_response.dart';
+export 'src/model/message/response/list_message_file.dart';
+export 'src/model/message/response/list_message_file_data.dart';
+export 'src/model/message/response/message_data.dart';
+export 'src/model/message/response/text.dart';
diff --git a/lib/src/messages.dart b/lib/src/messages.dart
index 31797d5..a28472c 100644
--- a/lib/src/messages.dart
+++ b/lib/src/messages.dart
@@ -1,10 +1,10 @@
-import 'package:chat_gpt_sdk/chat_gpt_sdk.dart';
 import 'package:chat_gpt_sdk/src/client/client.dart';
 import 'package:chat_gpt_sdk/src/model/message/request/create_message.dart';
 import 'package:chat_gpt_sdk/src/model/message/response/create_message_response.dart';
 import 'package:chat_gpt_sdk/src/model/message/response/list_message_file.dart';
 import 'package:chat_gpt_sdk/src/model/message/response/list_message_file_data.dart';
 import 'package:chat_gpt_sdk/src/model/message/response/message_data.dart';
+import 'package:chat_gpt_sdk/src/utils/constants.dart';
 
 class Messages {
   final OpenAIClient _client;
diff --git a/lib/src/model/run/request/create_run.dart b/lib/src/model/run/request/create_run.dart
new file mode 100644
index 0000000..f351403
--- /dev/null
+++ b/lib/src/model/run/request/create_run.dart
@@ -0,0 +1,61 @@
+class CreateRun {
+  ///The ID of the
+  ///<a href='https://platform.openai.com/docs/api-reference/assistants'>assistant</a>
+  /// to use to execute this run.
+  ///[assistantId]
+  final String assistantId;
+
+  ///The ID of the
+  ///<a href='https://platform.openai.com/docs/api-reference/models'>Model</a>
+  /// to be used to execute this run.
+  /// If a value is provided here,
+  /// it will override the model associated with the assistant.
+  /// If not, the model associated with the assistant will be used.
+  /// [model]
+  final String? model;
+
+  ///Overrides the
+  ///<a href='https://platform.openai.com/docs/api-reference/assistants/createAssistant'>instructions</a>
+  /// of the assistant.
+  /// This is useful for modifying the behavior on a per-run basis.
+  /// [instructions]
+  final String? instructions;
+
+  ///Appends additional instructions at the end of the instructions
+  /// for the run. This is useful for modifying the behavior
+  /// on a per-run basis without overriding other instructions.
+  /// [additionalInstructions]
+  final String? additionalInstructions;
+
+  ///Override the tools the assistant can use for this run.
+  /// This is useful for modifying the behavior on a per-run basis.
+  /// [tools]
+  final List<Map<String, dynamic>>? tools;
+
+  ///Set of 16 key-value pairs that can be attached to an object.
+  /// This can be useful for storing additional information
+  /// about the object in a structured format. Keys can be a
+  /// maximum of 64 characters long and values can be a
+  /// maxium of 512 characters long.
+  /// [metadata]
+  final Map<String, dynamic>? metadata;
+
+  CreateRun({
+    required this.assistantId,
+    this.model,
+    this.instructions,
+    this.additionalInstructions,
+    this.tools,
+    this.metadata,
+  });
+
+  Map<String, dynamic> toJson() => Map.of({
+        'assistant_id': assistantId,
+        'model': model,
+        'instructions': instructions,
+        'additional_instructions': additionalInstructions,
+        'tools': tools,
+        'metadata': metadata,
+      })
+        ..removeWhere((_, value) => value == null);
+}
diff --git a/lib/src/model/run/request/create_thread_and_run.dart b/lib/src/model/run/request/create_thread_and_run.dart
new file mode 100644
index 0000000..b748aa7
--- /dev/null
+++ b/lib/src/model/run/request/create_thread_and_run.dart
@@ -0,0 +1,64 @@
+class CreateThreadAndRun {
+  ///The ID of the
+  ///<a href='https://platform.openai.com/docs/api-reference/assistants'>assistant</a>
+  /// to use to execute this run.
+  /// [assistantId]
+  final String assistantId;
+
+  ///
+  /// [thread]
+  /// ## Example
+  /// ```dart
+  ///  {
+  ///    "messages": [
+  ///     {"role": "user", "content": "Explain deep learning to a 5 year old."}
+  ///     ]
+  ///   }
+  /// ```
+  final Map<String, dynamic>? thread;
+
+  ///The ID of the
+  ///<a href='https://platform.openai.com/docs/api-reference/models'>Model</a>
+  /// to be used to execute this run.
+  /// If a value is provided here, it will override the
+  /// model associated with the assistant.
+  /// If not, the model associated with the assistant will be used.
+  /// [model]
+  final String? model;
+
+  ///Override the default system message of the assistant.
+  /// This is useful for modifying the behavior on a per-run basis.
+  /// [instructions]
+  final String? instructions;
+
+  ///Override the tools the assistant can use for this run.
+  /// This is useful for modifying the behavior on a per-run basis.
+  /// [tools]
+  final List<Map<String, dynamic>>? tools;
+
+  ///Set of 16 key-value pairs that can be attached to an object.
+  /// This can be useful for storing additional information about
+  /// the object in a structured format. Keys can be a maximum of 64
+  /// characters long and values can be a maxium of 512 characters long.
+  /// [metadata]
+  final Map<String, dynamic>? metadata;
+
+  CreateThreadAndRun({
+    required this.assistantId,
+    this.thread,
+    this.model,
+    this.instructions,
+    this.tools,
+    this.metadata,
+  });
+
+  Map<String, dynamic> toJson() => Map.of({
+        'assistant_id': assistantId,
+        'thread': thread,
+        'model': model,
+        'instructions': instructions,
+        'tools': tools,
+        'metadata': metadata,
+      })
+        ..removeWhere((_, value) => value == null);
+}
diff --git a/lib/src/model/run/response/create_run_response.dart b/lib/src/model/run/response/create_run_response.dart
new file mode 100644
index 0000000..a9afcc3
--- /dev/null
+++ b/lib/src/model/run/response/create_run_response.dart
@@ -0,0 +1,102 @@
+import 'package:chat_gpt_sdk/src/model/assistant/response/tool.dart';
+import 'package:chat_gpt_sdk/src/model/run/response/step_detail.dart';
+import 'package:chat_gpt_sdk/src/model/run/response/usage.dart';
+
+class CreateRunResponse {
+  CreateRunResponse({
+    required this.metadata,
+    required this.assistantId,
+    required this.createdAt,
+    required this.tools,
+    required this.completedAt,
+    required this.threadId,
+    required this.fileIds,
+    required this.startedAt,
+    required this.model,
+    required this.id,
+    required this.object,
+    required this.status,
+    required this.usage,
+    required this.instructions,
+    required this.lastError,
+    required this.failedAt,
+    required this.cancelledAt,
+    required this.expiresAt,
+    required this.type,
+    required this.stepDetails,
+  });
+
+  Map<String, dynamic> metadata;
+  String assistantId;
+  int createdAt;
+  List<Tool> tools;
+  int completedAt;
+  String threadId;
+  List<String> fileIds;
+  int startedAt;
+  String model;
+  String id;
+  String object;
+  String status;
+  Usage? usage;
+  String instructions;
+  Map<String, dynamic> lastError;
+  int failedAt;
+  int cancelledAt;
+  int expiresAt;
+  String type;
+  StepDetail? stepDetails;
+
+  factory CreateRunResponse.fromJson(Map<String, dynamic> json) =>
+      CreateRunResponse(
+        metadata: json["metadata"] ?? {},
+        assistantId: json["assistant_id"] ?? '',
+        createdAt: json["created_at"] ?? 0,
+        tools: json["tools"] == null
+            ? []
+            : List<Tool>.from(json["tools"].map((x) => Tool.fromJson(x))),
+        completedAt: json["completed_at"] ?? '',
+        threadId: json["thread_id"] ?? '',
+        fileIds: json["file_ids"] == null
+            ? []
+            : List<String>.from(json["file_ids"].map((x) => x)),
+        startedAt: json["started_at"] ?? 0,
+        model: json["model"] ?? '',
+        id: json["id"] ?? '',
+        object: json["object"] ?? '',
+        status: json["status"] ?? '',
+        usage: json["usage"] == null ? null : Usage.fromJson(json["usage"]),
+        instructions: json['instructions'] ?? '',
+        lastError: json['last_error'] ?? {},
+        failedAt: json['failed_at'] ?? 0,
+        cancelledAt: json['cancelled_at'] ?? 0,
+        expiresAt: json['expires_at'] ?? 0,
+        type: json['type'] ?? '',
+        stepDetails: json['step_details'] == null
+            ? null
+            : StepDetail.fromJson(json['step_details']),
+      );
+
+  Map<String, dynamic> toJson() => {
+        "metadata": metadata,
+        "assistant_id": assistantId,
+        "created_at": createdAt,
+        "usage": usage?.toJson(),
+        "tools": tools.map((x) => x.toJson()),
+        "completed_at": completedAt,
+        "thread_id": threadId,
+        "file_ids": fileIds,
+        "started_at": startedAt,
+        "model": model,
+        "id": id,
+        "object": object,
+        "status": status,
+        'instructions': instructions,
+        'last_error': lastError,
+        'failed_at': failedAt,
+        'cancelled_at': cancelledAt,
+        'expires_at': expiresAt,
+        'type': type,
+        'step_details': stepDetails?.toJson(),
+      };
+}
diff --git a/lib/src/model/run/response/create_thread_and_run_data.dart b/lib/src/model/run/response/create_thread_and_run_data.dart
new file mode 100644
index 0000000..13d73a0
--- /dev/null
+++ b/lib/src/model/run/response/create_thread_and_run_data.dart
@@ -0,0 +1,64 @@
+class CreateThreadAndRunData {
+  CreateThreadAndRunData({
+    required this.instructions,
+    required this.metadata,
+    required this.assistantId,
+    required this.createdAt,
+    required this.tools,
+    required this.threadId,
+    required this.expiresAt,
+    required this.fileIds,
+    required this.model,
+    required this.id,
+    required this.object,
+    required this.status,
+  });
+
+  String instructions;
+  Map<String, dynamic> metadata;
+  String assistantId;
+  int createdAt;
+  List<Map<String, dynamic>> tools;
+  String threadId;
+  int expiresAt;
+  List<Map<String, dynamic>> fileIds;
+  String model;
+  String id;
+  String object;
+  String status;
+
+  factory CreateThreadAndRunData.fromJson(Map<String, dynamic> json) =>
+      CreateThreadAndRunData(
+        instructions: json["instructions"] ?? '',
+        metadata: json["metadata"] ?? {},
+        assistantId: json["assistant_id"] ?? '',
+        createdAt: json["created_at"] ?? '',
+        tools: json["tools"] == null
+            ? []
+            : List<Map<String, dynamic>>.from(json["tools"].map((x) => x)),
+        threadId: json["thread_id"] ?? '',
+        expiresAt: json["expires_at"] ?? '',
+        fileIds: json["file_ids"] == null
+            ? []
+            : List<Map<String, dynamic>>.from(json["file_ids"].map((x) => x)),
+        model: json["model"] ?? '',
+        id: json["id"] ?? '',
+        object: json["object"] ?? '',
+        status: json["status"] ?? '',
+      );
+
+  Map<String, dynamic> toJson() => {
+        "instructions": instructions,
+        "metadata": metadata,
+        "assistant_id": assistantId,
+        "created_at": createdAt,
+        "tools": tools,
+        "thread_id": threadId,
+        "expires_at": expiresAt,
+        "file_ids": fileIds,
+        "model": model,
+        "id": id,
+        "object": object,
+        "status": status,
+      };
+}
diff --git a/lib/src/model/run/response/list_run.dart b/lib/src/model/run/response/list_run.dart
new file mode 100644
index 0000000..0214d43
--- /dev/null
+++ b/lib/src/model/run/response/list_run.dart
@@ -0,0 +1,37 @@
+import 'package:chat_gpt_sdk/src/model/run/response/create_run_response.dart';
+
+class ListRun {
+  ListRun({
+    required this.firstId,
+    required this.data,
+    required this.lastId,
+    required this.hasMore,
+    required this.object,
+  });
+
+  String firstId;
+  List<CreateRunResponse> data;
+  String lastId;
+  bool hasMore;
+  String object;
+
+  factory ListRun.fromJson(Map<String, dynamic> json) => ListRun(
+        firstId: json["first_id"],
+        data: json["data"] == null
+            ? []
+            : List<CreateRunResponse>.from(
+                json["data"].map((x) => CreateRunResponse.fromJson(x)),
+              ),
+        lastId: json["last_id"],
+        hasMore: json["has_more"],
+        object: json["object"],
+      );
+
+  Map<String, dynamic> toJson() => {
+        "first_id": firstId,
+        "data": data.map((x) => x.toJson()).toList(),
+        "last_id": lastId,
+        "has_more": hasMore,
+        "object": object,
+      };
+}
diff --git a/lib/src/model/run/response/message_creation.dart b/lib/src/model/run/response/message_creation.dart
new file mode 100644
index 0000000..8b17ee6
--- /dev/null
+++ b/lib/src/model/run/response/message_creation.dart
@@ -0,0 +1,16 @@
+class MessageCreation {
+  MessageCreation({
+    required this.messageId,
+  });
+
+  String messageId;
+
+  factory MessageCreation.fromJson(Map<String, dynamic> json) =>
+      MessageCreation(
+        messageId: json["message_id"] ?? '',
+      );
+
+  Map<String, dynamic> toJson() => {
+    "message_id": messageId,
+  };
+}
\ No newline at end of file
diff --git a/lib/src/model/run/response/step_detail.dart b/lib/src/model/run/response/step_detail.dart
new file mode 100644
index 0000000..3c47e06
--- /dev/null
+++ b/lib/src/model/run/response/step_detail.dart
@@ -0,0 +1,21 @@
+import 'message_creation.dart';
+
+class StepDetail {
+  StepDetail({
+    required this.messageCreation,
+    required this.type,
+  });
+
+  MessageCreation messageCreation;
+  String type;
+
+  factory StepDetail.fromJson(Map<String, dynamic> json) => StepDetail(
+        messageCreation: MessageCreation.fromJson(json["message_creation"]),
+        type: json["type"] ?? '',
+      );
+
+  Map<String, dynamic> toJson() => {
+        "message_creation": messageCreation.toJson(),
+        "type": type,
+      };
+}
diff --git a/lib/src/model/run/response/tool.dart b/lib/src/model/run/response/tool.dart
new file mode 100644
index 0000000..1b5a9f5
--- /dev/null
+++ b/lib/src/model/run/response/tool.dart
@@ -0,0 +1,15 @@
+class Tool {
+  Tool({
+    required this.type,
+  });
+
+  String type;
+
+  factory Tool.fromJson(Map<dynamic, dynamic> json) => Tool(
+    type: json["type"],
+  );
+
+  Map<dynamic, dynamic> toJson() => {
+    "type": type,
+  };
+}
\ No newline at end of file
diff --git a/lib/src/model/run/response/usage.dart b/lib/src/model/run/response/usage.dart
new file mode 100644
index 0000000..925f308
--- /dev/null
+++ b/lib/src/model/run/response/usage.dart
@@ -0,0 +1,24 @@
+
+class Usage {
+  Usage({
+    required this.completionTokens,
+    required this.promptTokens,
+    required this.totalTokens,
+  });
+
+  int completionTokens;
+  int promptTokens;
+  int totalTokens;
+
+  factory Usage.fromJson(Map<String, dynamic> json) => Usage(
+    completionTokens: json["completion_tokens"] ?? 0,
+    promptTokens: json["prompt_tokens"] ?? 0,
+    totalTokens: json["total_tokens"] ?? 0,
+  );
+
+  Map<String, dynamic> toJson() => {
+    "completion_tokens": completionTokens,
+    "prompt_tokens": promptTokens,
+    "total_tokens": totalTokens,
+  };
+}
\ No newline at end of file
diff --git a/lib/src/runs.dart b/lib/src/runs.dart
new file mode 100644
index 0000000..67ad698
--- /dev/null
+++ b/lib/src/runs.dart
@@ -0,0 +1,137 @@
+import 'package:chat_gpt_sdk/chat_gpt_sdk.dart';
+import 'package:chat_gpt_sdk/src/client/client.dart';
+import 'package:chat_gpt_sdk/src/model/run/request/create_run.dart';
+import 'package:chat_gpt_sdk/src/model/run/request/create_thread_and_run.dart';
+import 'package:chat_gpt_sdk/src/model/run/response/create_run_response.dart';
+import 'package:chat_gpt_sdk/src/model/run/response/create_thread_and_run_data.dart';
+import 'package:chat_gpt_sdk/src/model/run/response/list_run.dart';
+
+class Runs {
+  final OpenAIClient _client;
+  final Map<String, String> _headers;
+
+  Runs({required OpenAIClient client, required Map<String, String> headers})
+      : _client = client,
+        _headers = headers;
+
+  ///Create a run.
+  ///[createRun]
+  Future<CreateRunResponse> createRun({
+    required String threadId,
+    required CreateRun request,
+  }) {
+    return _client.post(
+      _client.apiUrl + kThread + "/$threadId/$kRuns",
+      request.toJson(),
+      headers: _headers,
+      onSuccess: CreateRunResponse.fromJson,
+      onCancel: (cancelData) => null,
+    );
+  }
+
+  ///Create a thread and run it in one request.
+  ///[createThreadAndRun]
+  Future<CreateThreadAndRunData> createThreadAndRun({
+    required CreateThreadAndRun request,
+  }) {
+    return _client.post(
+      _client.apiUrl + kThread + "/$kRuns",
+      request.toJson(),
+      headers: _headers,
+      onSuccess: CreateThreadAndRunData.fromJson,
+      onCancel: (cancelData) => null,
+    );
+  }
+
+  Future<ListRun> listRuns({
+    required String threadId,
+    int limit = 20,
+    String order = 'desc',
+    String? after,
+    String? before,
+  }) {
+    String url = after != null || before != null
+        ? _client.apiUrl +
+            kThread +
+            "/$threadId/$kRuns?limit=$limit&order=$order&after=$after&before=$before"
+        : _client.apiUrl +
+            kThread +
+            "/$threadId/$kRuns?limit=$limit&order=$order";
+
+    return _client.get(
+      url,
+      headers: _headers,
+      onSuccess: ListRun.fromJson,
+      onCancel: (cancelData) => null,
+    );
+  }
+
+  Future<ListRun> listRunSteps({
+    required String threadId,
+    required String runId,
+    int limit = 20,
+    String order = 'desc',
+    String? after,
+    String? before,
+  }) {
+    String url = after != null || before != null
+        ? _client.apiUrl +
+            kThread +
+            "/$threadId/$kRuns/$runId/steps?limit=$limit&order=$order&after=$after&before=$before"
+        : _client.apiUrl +
+            kThread +
+            "/$threadId/$kRuns/$runId/steps?limit=$limit&order=$order";
+
+    return _client.get(
+      url,
+      headers: _headers,
+      onSuccess: ListRun.fromJson,
+      onCancel: (cancelData) => null,
+    );
+  }
+
+  Future<CreateRunResponse> retrieveRun({
+    required String threadId,
+    required String runId,
+  }) {
+    return _client.get(
+      _client.apiUrl + kThread + "/$threadId/$kRuns/$runId",
+      headers: _headers,
+      onSuccess: CreateRunResponse.fromJson,
+      onCancel: (cancelData) => null,
+    );
+  }
+
+  Future<CreateRunResponse> retrieveRunStep({
+    required String threadId,
+    required String runId,
+    required String stepId,
+  }) {
+    return _client.get(
+      _client.apiUrl + kThread + "/$threadId/$kRuns/$runId/steps/$stepId",
+      headers: _headers,
+      onSuccess: CreateRunResponse.fromJson,
+      onCancel: (cancelData) => null,
+    );
+  }
+
+  ///
+  /// [metadata]
+  /// Set of 16 key-value pairs that can be attached to an object.
+  /// This can be useful for storing additional information about
+  /// the object in a structured format. Keys can be a maximum of 64
+  /// characters long and values can be a maxium of 512 characters long.
+  Future<CreateRunResponse> modifyRun({
+    required String threadId,
+    required String runId,
+    required Map<String, dynamic> metadata,
+  }) {
+    return _client.post(
+      _client.apiUrl + "$kThread/$threadId/$kRuns/$runId",
+      metadata,
+      headers: _headers,
+      onSuccess: CreateRunResponse.fromJson,
+      onCancel: (cancelData) => null,
+    );
+  }
+}
diff --git a/lib/src/threads.dart b/lib/src/threads.dart
index fd884e8..de9847f 100644
--- a/lib/src/threads.dart
+++ b/lib/src/threads.dart
@@ -1,5 +1,6 @@
 import 'package:chat_gpt_sdk/src/client/openai_client.dart';
 import 'package:chat_gpt_sdk/src/messages.dart';
+import 'package:chat_gpt_sdk/src/runs.dart';
 import 'package:chat_gpt_sdk/src/model/thread/request/thread_request.dart';
 import 'package:chat_gpt_sdk/src/model/thread/response/thread_delete_response.dart';
 import 'package:chat_gpt_sdk/src/model/thread/response/thread_response.dart';
@@ -72,4 +73,7 @@ class Threads {
   ///messages
   Messages get messages =>
       Messages(client: _client, headers: headersAssistants);
+
+  ///runs
+  Runs get runs => Runs(client: _client, headers: headersAssistants);
 }
diff --git a/lib/src/utils/constants.dart b/lib/src/utils/constants.dart
index 04afc25..d477394 100644
--- a/lib/src/utils/constants.dart
+++ b/lib/src/utils/constants.dart
@@ -54,6 +54,9 @@ const kAssistants = 'assistants';
 ///messages
 const kMessages = 'messages';
 
+///runs
+const kRuns = 'runs';
+
 ///model name
 const kGpt3TurboInstruct = 'gpt-3.5-turbo-instruct';