Update app.py

app.py

@@ -79,7 +79,7 @@ def respond(message, chat_history):
     # Get model
     model = get_model()
     # Create ChatOpenAI and ConversationalRetrievalChain
-    model = ChatOpenAI(model=model)
+    model = ChatOpenAI(model_name=model)
     qa = ConversationalRetrievalChain.from_llm(model, retriever)
 
     # Generate a bot message