Update app.py

app.py

@@ -44,7 +44,7 @@ def respond(message, chat_history):
     if len(chat_history) != 0: 
         chat_history = [(chat_history[0][0], chat_history[0][1])]
 
-    model = str(get_model()[0])    
+    model = get_model()
     # Create ChatOpenAI and ConversationalRetrievalChain
     model = ChatOpenAI(model=model)
     qa = ConversationalRetrievalChain.from_llm(model, retriever)