Update app.py

app.py

@@ -8,7 +8,7 @@ os.environ["OPENAI_API_KEY"] = 'sk-TueoHxxhKJB3aZpilkN3T3BlbkFJY5RKtoBTLu43LijFt
 def construct_index(directory_path):
     num_outputs = 256
 
-    _llm_predictor = LLMPredictor(llm=OpenAI(temperature=0.5, model_name="gpt-3.5 turbo", max_tokens=num_outputs))
+    _llm_predictor = LLMPredictor(llm=OpenAI(temperature=0.5, model_name="text-davinci-003", max_tokens=num_outputs))
 
     service_context = ServiceContext.from_defaults(llm_predictor=_llm_predictor)