diff --git a/Runtime/DataTypes.cs b/Runtime/DataTypes.cs
index 392188f..b94e497 100644
--- a/Runtime/DataTypes.cs
+++ b/Runtime/DataTypes.cs
@@ -97,6 +97,12 @@ public sealed class CreateChatCompletionRequest
         public Dictionary<string, string> LogitBias { get; set; }
         public string User { get; set; }
         public string SystemFingerprint { get; set; }
+        public ResponseFormat ResponseFormat { get; set; }
+    }
+
+    public class ResponseFormat
+    {
+        public string Type { get; set; } = ResponseType.Text;
     }
 
     public struct CreateChatCompletionResponse : IResponse
@@ -351,6 +357,12 @@ public static class ContentType
         public const string MultipartFormData = "multipart/form-data";
         public const string ApplicationJson = "application/json";
     }
+    
+    public static class ResponseType
+    {
+        public const string Text = "text";
+        public const string JsonObject = "json_object";
+    }
 
     public static class ImageSize
     {
diff --git a/Samples~/ChatGPT/ChatGPT.cs b/Samples~/ChatGPT/ChatGPT.cs
index 8060920..29cbf78 100644
--- a/Samples~/ChatGPT/ChatGPT.cs
+++ b/Samples~/ChatGPT/ChatGPT.cs
@@ -58,7 +58,7 @@ private async void SendReply()
             // Complete the instruction
             var completionResponse = await openai.CreateChatCompletion(new CreateChatCompletionRequest()
             {
-                Model = "gpt-3.5-turbo-0613",
+                Model = "gpt-3.5-turbo",
                 Messages = messages
             });
 
diff --git a/Samples~/Stream Response/StreamResponse.cs b/Samples~/Stream Response/StreamResponse.cs
index a3decc4..90d7bb4 100644
--- a/Samples~/Stream Response/StreamResponse.cs	
+++ b/Samples~/Stream Response/StreamResponse.cs	
@@ -1,9 +1,8 @@
-using System;
 using UnityEngine;
 using System.Linq;
 using UnityEngine.UI;
-using System.Collections.Generic;
 using System.Threading;
+using System.Collections.Generic;
 
 namespace OpenAI
 {
@@ -35,7 +34,7 @@ private void SendMessage()
             
             openai.CreateChatCompletionAsync(new CreateChatCompletionRequest()
             {
-                Model = "gpt-3.5-turbo-0301",
+                Model = "gpt-3.5-turbo",
                 Messages = message,
                 Stream = true
             }, HandleResponse, null, token);
diff --git a/Tests/ModelsApiTests.cs b/Tests/ModelsApiTests.cs
index 7153df1..549251e 100644
--- a/Tests/ModelsApiTests.cs
+++ b/Tests/ModelsApiTests.cs
@@ -17,7 +17,7 @@ public async Task List_Models()
         [Test]
         public async Task Retrieve_Models()
         {
-            var id = "text-davinci-003";
+            var id = "gpt-3.5-turbo";
             var models = await openai.RetrieveModel(id);
             Assert.AreEqual(id, models.Id);
         }
diff --git a/package.json b/package.json
index 098497a..5ffc81e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "com.srcnalt.openai-unity",
-  "version": "0.2.0",
+  "version": "0.2.1",
   "displayName": "OpenAI Unity",
   "description": "An unofficial OpenAI Unity package that aims to help you use OpenAI API directly in Unity game engine.",
   "unity": "2020.3",