updating gpt model

app.py

@@ -95,7 +95,7 @@ def create_chat_interface():
             raise Exception("OpenAI client not initialized. Please check your API key.")
         
         response = client.chat.completions.create(
-            model="gpt-3.5-turbo",
+            model="gpt-4o-mini",
             messages=messages
         )
         
@@ -103,7 +103,7 @@ def create_chat_interface():
         if langfuse and trace:
             try:
                 trace.update(
-                    metadata={"model": "gpt-3.5-turbo", "tokens": response.usage.total_tokens}
+                    metadata={"model": "gpt-4o-mini", "tokens": response.usage.total_tokens}
                 )
             except Exception as e:
                 print(f"Warning: Failed to update trace metadata: {e}")