Update app.py

app.py

@@ -32,7 +32,7 @@ retriever = vector_store.as_retriever(search_kwargs={"k": 2})
 from langchain.chat_models import ChatOpenAI
 from langchain.chains import RetrievalQAWithSourcesChain
 
-llm = ChatOpenAI(model_name="gpt-3.5", temperature=0)  # Modify model_name if you have access to GPT-4
+llm = ChatOpenAI(model_name="gpt-3.5-turbo", temperature=0)  # Modify model_name if you have access to GPT-4
 
 chain = RetrievalQAWithSourcesChain.from_chain_type(
     llm=llm,
@@ -66,7 +66,7 @@ from langchain.chains import RetrievalQAWithSourcesChain
 
 chain_type_kwargs = {"prompt": prompt}
 
-llm = ChatOpenAI(model_name="gpt-3.5", temperature=0)  # Modify model_name if you have access to GPT-4
+llm = ChatOpenAI(model_name="gpt-3.5-turbo", temperature=0)  # Modify model_name if you have access to GPT-4
 
 chain = RetrievalQAWithSourcesChain.from_chain_type(
     llm=llm,