Create llm.py

llm.py

@@ -0,0 +1,14 @@
+import os
+from langchain_openai import ChatOpenAI
+
+def get_llm():
+    return ChatOpenAI(
+        model=os.getenv(
+            "OPENROUTER_MODEL",
+            "meta-llama/llama-3-8b-instruct"
+        ),
+        api_key=os.getenv("OPENROUTER_API_KEY"),
+        base_url="https://openrouter.ai/api/v1",
+        temperature=0.4,
+        max_tokens=700
+    )