diff --git a/tests/test_models.py b/tests/test_models.py
index cd11819a..f8aaf9cc 100644
--- a/tests/test_models.py
+++ b/tests/test_models.py
@@ -168,3 +168,12 @@ def test_routes_through_litellm_matches_the_provider(
     while isinstance(model, _NonStreamingModel | _TurnGuardModel):
         model = model._inner
     assert isinstance(model, LitellmModel) is litellm
+
+def test_api_type_override_settings() -> None:
+    from strix.config.settings import LlmSettings, Settings
+    from strix.config.models import uses_chat_completions_tool_schema
+    settings_chat = Settings(llm=LlmSettings(api_type="chat_completions", model="gpt-4"))
+    assert uses_chat_completions_tool_schema("gpt-4", settings_chat) is True
+    settings_resp = Settings(llm=LlmSettings(api_type="responses", model="openai/gpt-4"))
+    assert uses_chat_completions_tool_schema("openai/gpt-4", settings_resp) is False
+