Update app.py

app.py

@@ -63,7 +63,7 @@ def get_vectorstore(chunks):
 
 # generating conversation chain  
 def get_conversationchain(vectorstore):
-    llm=ChatOpenAI(temperature=0.2,model_name='gpt-3.5-turbo-0125')
+    llm=ChatOpenAI(temperature=0.4,model_name='gpt-4o-mini')
     memory = ConversationBufferMemory(memory_key='chat_history', 
                                       return_messages=True,
                                       output_key='answer') # using conversation buffer memory to hold past information