changed default config app.py

app.py

@@ -31,8 +31,8 @@ Think through your response step by step.
 @cl.on_chat_start  # marks a function that will be executed at the start of a user session
 async def start_chat():
     settings = {
-        "model": "gpt-3.5-turbo",
-        "temperature": 0.0,
+        "model": "gpt-4",
+        "temperature": 0.5,
         "max_tokens": 500,
         "top_p": 1,
         "frequency_penalty": 0,