diff --git a/src/graph.py b/src/graph.py
index bdbcd69..5130d1a 100644
--- a/src/graph.py
+++ b/src/graph.py
@@ -216,7 +216,7 @@ def create_agent_graph(
     client: OpenAI,
     agent_skills: list[str],
     system_prompt: str,
-    model_name: str = "deepseek-chat",
+    model_name: str = "deepseek-v4-flash",
 ) -> StateGraph:
     """
     Build and compile a LangGraph StateGraph for a single agent.