diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5632433..39faea2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -240,4 +240,8 @@
 
 ## 3.0.9
 - Assistants v2
-- Deprecate API
\ No newline at end of file
+- Deprecate API
+
+## 3.1.0
+ - Add Gpt 4o mini
+ - Add Doc API version 2 (Assistants v2)
\ No newline at end of file
diff --git a/README.md b/README.md
index 6d57870..83cbb71 100644
--- a/README.md
+++ b/README.md
@@ -47,11 +47,13 @@ supervised and reinforcement learning techniques.
   - [Modify assistant](#modify-assistant)
   - [Delete assistant](#delete-assistant)
   - [Delete assistant file](#delete-assistant-file)
+  - [Using Assistants V2](#using-assistant-v2)
 - [Threads](#threads)
   - [Create thread](#Create-threads)
   - [Retrieve thread](#Retrieve-thread)
   - [Modify thread](#Modify-thread)
   - [Delete thread](#Delete-thread)
+  - [Using Thread V2](#using-thread-v2)
 - [Messages](#messages)
   - [Create message](#Create-message)
   - [List messages](#List-messages)
@@ -59,6 +61,7 @@ supervised and reinforcement learning techniques.
   - [Retrieve message](#Retrieve-message)
   - [Retrieve message file](#Retrieve-message-file)
   - [Modify message](#Modify-message)
+  - [Using Message V2](#using-message-v2)
 - [Runs](#runs)
   - [Create run](#Create-run)
   - [Create thread and run](#Create-thread-and-run)
@@ -111,7 +114,7 @@ supervised and reinforcement learning techniques.
 
 ## Install Package
 ```dart
-chat_gpt_sdk: 3.0.8
+chat_gpt_sdk: 3.1.0
 ```
 
 ## Create OpenAI Instance
@@ -414,6 +417,11 @@ void createAssistantFile() async {
 }
 ```
 
+- ## Using assistant v2
+```dart
+openAI.assistant.v2;
+```
+
 ## Threads
  - ### Create threads
 ```dart
@@ -466,6 +474,11 @@ void createThreads() async {
 }
 ```
 
+- ## Using Thread V2
+```dart
+openAI.threads.v2;
+```
+
 ## Messages
 - ### Create Message
 ```dart
@@ -530,6 +543,12 @@ void retrieveMessageFile() async {
   );
 }
 ```
+
+- ## Using Message V2
+```dart
+openAI.threads.v2.messages;
+```
+
 ## Runs
 - ### Create run
 ```dart
diff --git a/example/pubspec.lock b/example/pubspec.lock
index dbd425b..2cdfc2f 100644
--- a/example/pubspec.lock
+++ b/example/pubspec.lock
@@ -31,7 +31,7 @@ packages:
       path: ".."
       relative: true
     source: path
-    version: "3.0.9"
+    version: "3.1.0"
   clock:
     dependency: transitive
     description:
diff --git a/lib/src/model/thread/response/thread_response.dart b/lib/src/model/thread/response/thread_response.dart
index bc5e985..bc8c6b0 100644
--- a/lib/src/model/thread/response/thread_response.dart
+++ b/lib/src/model/thread/response/thread_response.dart
@@ -18,7 +18,9 @@ class ThreadResponse {
       createdAt: json["created_at"] ?? 0,
       id: json["id"] ?? '',
       object: json["object"] ?? '',
-      toolResources: json['tool_resources'] is Map<String, double> ? json['tool_resources'] : null);
+      toolResources: json['tool_resources'] is Map<String, double>
+          ? json['tool_resources']
+          : null);
 
   Map<String, dynamic> toJson() => {
         "metadata": metadata,
diff --git a/pubspec.yaml b/pubspec.yaml
index 85191fb..af4812e 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: chat_gpt_sdk
 description: create chat bot and other bot with ChatGPT SDK Support GPT-4 , 3.5 and SSE Generate Prompt (Stream)
-version: 3.0.9
+version: 3.1.0
 homepage: https://www.facebook.com/REDEVRX
 repository: https://github.com/redevRx/Flutter-ChatGPT