Update app.py

app.py

@@ -2,13 +2,13 @@ import streamlit as st
 from hazm import Normalizer, SentenceTokenizer
 import os
 import docx
-from openai import OpenAI
+from langchain.chat_models import ChatOpenAI
 
 # LLM setup
-llm = OpenAI(
+llm = ChatOpenAI(
     base_url="https://api.together.xyz/v1",
     api_key='0291f33aee03412a47fa5d8e562e515182dcc5d9aac5a7fb5eefdd1759005979',
-    model="meta-llama/Llama-3.3-70B-Instruct-Turbo-Free"
+    model="deepseek-ai/DeepSeek-R1"
 )
 
 def rewrite_answer_with_llm(answer, user_input):