Update app.py

app.py

@@ -43,9 +43,9 @@ messages4 = initial_messages4.copy()
 def openai_create(user_input, messages):
     messages.append({"role": "user", "content": user_input})
     response = openai.ChatCompletion.create(
-        model="gpt-3.5-turbo",
+        model="gpt-4",
         messages=messages,
-        temperature=0.0,
+        temperature=0.5,
         top_p=1,
         frequency_penalty=0,
         presence_penalty=0.6,