change model

app/rag.py

@@ -65,7 +65,7 @@ def get_qa_chain(user_id: str):
     # Initialize LLM with OpenRouter
     llm = ChatOpenAI(
         openai_api_key=OPENAI_ROUTER_TOKEN,  # your OpenRouter API key
-        model="nousresearch/hermes-3-llama-3.1-405b:free",       # free OpenRouter model
+        model="meta-llama/llama-3.2-3b-instruct:free",       # free OpenRouter model
         temperature=0,
         max_tokens=512,
         openai_api_base="https://openrouter.ai/api/v1"  # OpenRouter endpoint