Update app.py

app.py

@@ -38,7 +38,7 @@ from huggingface_hub import CommitScheduler
 # deprecated
 storage_context = StorageContext.from_defaults(persist_dir='./')
 # gpt-3.5_turbo is the current default model
-llm_predictor = OpenAI(temperature=0.5, model="gpt-3.5_turbo")
+llm_predictor = OpenAI(temperature=0.5, model="gpt-4")
 #service_context = ServiceContext.from_defaults(llm=llm_predictor)
 #index = load_index_from_storage(storage_context, service_context=service_context)
 index = load_index_from_storage(storage_context)