diff --git a/simpleaudit/targets/decision.py b/simpleaudit/targets/decision.py
index 96999d6..9aa426c 100644
--- a/simpleaudit/targets/decision.py
+++ b/simpleaudit/targets/decision.py
@@ -45,8 +45,8 @@
 #: Ollama's request-body cap for System One requests without images.
 OLLAMA_MAX_BODY_BYTES = 64 * 1024
 
-#: OpenRouter's Decisions API (alpha).
-OPENROUTER_DECISIONS_URL = "https://openrouter.ai/api/alpha/decisions"
+#: OpenRouter's System One endpoint (``POST /api/v1/systemone``).
+OPENROUTER_SYSTEMONE_URL = "https://openrouter.ai/api/v1/systemone"
 
 
 class DecisionTarget:
@@ -97,7 +97,7 @@ def openrouter(cls, model: str, api_key: str | None = None, **kwargs: Any) -> De
         ``{"provider": {"zdr": True}}``) can be passed as ``extra_body``.
         """
         return cls(
-            OPENROUTER_DECISIONS_URL,
+            OPENROUTER_SYSTEMONE_URL,
             model,
             api_key=api_key or os.environ.get("OPENROUTER_API_KEY"),
             **kwargs,
diff --git a/tests/test_decision_target.py b/tests/test_decision_target.py
index f26f6cb..79edcc0 100644
--- a/tests/test_decision_target.py
+++ b/tests/test_decision_target.py
@@ -280,7 +280,7 @@ def test_ollama_constructor():
 def test_openrouter_constructor_reads_the_key_from_the_environment(monkeypatch):
     monkeypatch.setenv("OPENROUTER_API_KEY", "sk-env")
     target = DecisionTarget.openrouter("typesafe/jev-1.13", extra_body={"provider": {"zdr": True}})
-    assert target.url == "https://openrouter.ai/api/alpha/decisions"
+    assert target.url == "https://openrouter.ai/api/v1/systemone"
     assert target.headers["Authorization"] == "Bearer sk-env"
     assert target.max_body_bytes is None
     assert target.extra_body == {"provider": {"zdr": True}}