Update app.py

app.py

@@ -31,7 +31,7 @@ class RamsayGPT:
         self.chat_log.append({"role": "user", "content": user_message})
         try:
             response = openai.chat.completions.create(
-                model="gpt-4",
+                model="gpt-3.5",
                 messages=self.chat_log
             )
             assistant_response = response.choices[0].message.content