Update app.py

app.py

@@ -63,8 +63,8 @@ async def parse_query(nl_query):
     ]
 
     try:
-        response = await client.chat.completions.create(
-            model="gpt-3.5-turbo",
+        response =  openai.chat.completions.create(
+            model="gpt-4",
             messages=messages,
             temperature=0,
             max_tokens=150,