Update app.py

app.py

@@ -61,7 +61,7 @@ END SYSTEM INSTRUCTIONS"""
 
         # OpenAI chat completion using older package format
         chat_completion = openai.ChatCompletion.create(
-            model="gpt-4o-mini",
+            model="gpt-4o",
             messages=[
                 {"role": "system", "content": system_prompt},
                 {"role": "user", "content": query}