Update app.py

app.py

@@ -37,7 +37,7 @@ if openai_api_key:
     llm = ChatOpenAI(
         temperature=0.1,
         max_tokens=2048,
-        model_name="gpt-3.5-turbo",
+        model_name="gpt-4o",
         openai_api_key=openai_api_key
     )