feat: Added ChatClient LatestSmartModel/LatestFastModel constants.

src/libs/OpenAI/ChatClient.AsStream.cs

@@ -165,12 +165,4 @@ public partial class ChatClient
             }
         }
     }
-
-    public sealed partial class JsonSerializerContextTypes
-    {
-        /// <summary>
-        /// 
-        /// </summary>
-        public CreateChatCompletionStreamResponse? CreateChatCompletionStreamResponse { get; set; }
-    }
 }

src/libs/OpenAI/ChatClient.LatestModelConstants.cs

@@ -0,0 +1,14 @@
+namespace OpenAI;
+
+public partial class ChatClient
+{
+    /// <summary>
+    /// Always points to the latest smart model.
+    /// </summary>
+    public const CreateChatCompletionRequestModel LatestSmartModel = CreateChatCompletionRequestModel.Gpt4o;
+
+    /// <summary>
+    /// Always points to the latest fast model.
+    /// </summary>
+    public const CreateChatCompletionRequestModel LatestFastModel = CreateChatCompletionRequestModel.Gpt4oMini;
+}

src/libs/OpenAI/SourceGenerationContext.AdditionalTypes.cs → src/libs/OpenAI/JsonSerializerContextTypes.AdditionalTypes.cs

@@ -6,4 +6,9 @@ public sealed partial class JsonSerializerContextTypes
     /// To fix issue with LogitBias.
     /// </summary>
     public Dictionary<string, double>? StringDoubleDictionary { get; set; }
+
+    /// <summary>
+    /// 
+    /// </summary>
+    public CreateChatCompletionStreamResponse? CreateChatCompletionStreamResponse { get; set; }
 }