diff --git a/packages/gpt.gblib/services/ChatServices.ts b/packages/gpt.gblib/services/ChatServices.ts
index 6b927db7..8b457230 100644
--- a/packages/gpt.gblib/services/ChatServices.ts
+++ b/packages/gpt.gblib/services/ChatServices.ts
@@ -293,6 +293,7 @@ export class ChatServices {
 
     if (azureOpenAIKey) {
       model = new AzureOpenAI({
+        modelName: 'gpt-4o',
         azureOpenAIEndpoint: azureOpenAIEndpoint,
         apiKey: azureOpenAIKey,
         azureOpenAIApiDeploymentName: azureOpenAIDeployment