Update app.py

app.py

@@ -34,7 +34,9 @@ callback_manager = CallbackManager([llama_debug])
 Settings.callback_manager = callback_manager
 
 # set up LLM
-llm = Groq(model="llama3-8b-8192")#"llama3-8b-8192")
+#llm = Groq(model="llama3-8b-8192")#"llama3-8b-8192")
+OPENAI_API_KEY = os.getenv('OPENAI_API_KEY')
+llm = OpenAI(model="gpt-3.5-turbo")
 Settings.llm = llm
 
 # set up embedding model