Update app.py

app.py

@@ -99,7 +99,7 @@ If you cannot find specific information about this exact business, please indica
 
     try:
         response = client.chat.completions.create(
-            model="gpt-4",
+            model="gpt-5",
             messages=[
                 {"role": "system", "content": "You are a comprehensive business research analyst with access to current web information. Search thoroughly and provide detailed, actionable insights about businesses."},
                 {"role": "user", "content": research_prompt}