Update app.py

app.py

@@ -134,12 +134,14 @@ retriever = db.as_retriever(
 
 
 llm = ChatOpenAI(
-    base_url="https://openrouter.ai/api/v1",
+    # base_url="https://openrouter.ai/api/v1",
+    base_url="https://api.cerebras.ai/v1/chat/completions",
     temperature=0,
-    api_key=OPENAPI_KEY,
-    model="google/gemini-2.0-flash-exp:free",
+    api_key=C_apikey,
+    model="llama-3.3-70b",
     max_tokens=None,
-    timeout=None
+    timeout=None,
+    stream=True
     
 )