Update app.py

app.py

@@ -58,7 +58,8 @@ def load_pdf(file_path):
     return VectorStore
 
 def load_chatbot(max_tokens=300):
-    return load_qa_chain(llm=OpenAI(temperature=0.1, max_tokens=max_tokens), chain_type="stuff") 
+    return load_qa_chain(llm=OpenAI(temperature=0.1, max_tokens=max_tokens, model="gpt-3.5-turbo"), chain_type="stuff") 
+    
 
 def display_chat_history(chat_history):
     for chat in chat_history: