diff --git a/apps/agent/agent/server.py b/apps/agent/agent/server.py
index 347edda0..07dabe37 100644
--- a/apps/agent/agent/server.py
+++ b/apps/agent/agent/server.py
@@ -377,7 +377,7 @@ async def get_agent(config: RunnableConfig) -> Pregel:  # noqa: PLR0915
 
     logger.info("Returning agent with sandbox for thread %s", thread_id)
     return create_deep_agent(
-        model=make_model("openai:gpt-5.3-codex", temperature=0, max_tokens=20_000),
+        model=make_model("anthropic:claude-opus-4-6", temperature=0, max_tokens=20_000),
         system_prompt=construct_system_prompt(
             repo_dir,
             linear_project_id=linear_project_id,