UI update complete?

tests/test_config.py

@@ -71,13 +71,18 @@ class TestProviderSettings:
         with pytest.raises(ValidationError):
             _make_settings(provider="not-a-provider")
 
-    def test_optional_fields_default_to_none(self):
-        """provider_model, openrouter_http_referer, and openrouter_app_title are None when unset."""
+    def test_optional_provider_header_fields_default_to_none(self):
+        """openrouter_http_referer and openrouter_app_title are None when unset."""
         settings = _make_settings()
-        assert settings.provider_model is None
         assert settings.openrouter_http_referer is None
         assert settings.openrouter_app_title is None
 
+    def test_provider_model_accepts_env_default(self, monkeypatch):
+        """provider_model is sourced when provided through environment configuration."""
+        monkeypatch.setenv("PROVIDER_MODEL", "google/gemini-2.5-flash")
+        settings = Settings(openrouter_api_key="test-key-abc123")
+        assert settings.provider_model == "google/gemini-2.5-flash"
+
 
 class TestPathSettings:
     """Verify filesystem path field types."""