diff --git a/tests/run_agent/test_provider_parity.py b/tests/run_agent/test_provider_parity.py
index d3a5a1b37fa..c65c22004a9 100644
--- a/tests/run_agent/test_provider_parity.py
+++ b/tests/run_agent/test_provider_parity.py
@@ -61,6 +61,8 @@ def _make_agent(monkeypatch, provider, api_mode="chat_completions", base_url="ht
     )
     if model:
         kwargs["model"] = model
+    elif provider == "nous":
+        kwargs["model"] = "gpt-5"
     base_url="https://openrouter.ai/api/v1",
     api_key="test-key",
     base_url="https://openrouter.ai/api/v1",