diff --git a/test/registered/models/test_gpt_oss_models_pcg.py b/test/registered/models/test_gpt_oss_models_pcg.py
new file mode 100644
index 000000000..9bbd621a4
--- /dev/null
+++ b/test/registered/models/test_gpt_oss_models_pcg.py
@@ -0,0 +1,72 @@
+"""
+GPT-OSS piecewise CUDA graph tests.
+"""
+
+import unittest
+from types import SimpleNamespace
+
+from sglang.srt.utils import kill_process_tree
+from sglang.test.ci.ci_register import register_cuda_ci
+from sglang.test.few_shot_gsm8k import run_eval
+from sglang.test.test_utils import (
+    DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+    DEFAULT_URL_FOR_TEST,
+    CustomTestCase,
+    popen_launch_server,
+)
+
+register_cuda_ci(
+    est_time=400,
+    suite="stage-b-test-large-2-gpu",
+)
+
+GPT_OSS_MODEL = "openai/gpt-oss-120b"
+
+ACC_THRESHOLDS = {
+    GPT_OSS_MODEL: {"gsm8k": 0.81},
+}
+
+
+class TestGptOssPiecewiseCudaGraph(CustomTestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        cls.model = GPT_OSS_MODEL
+        cls.base_url = DEFAULT_URL_FOR_TEST
+        cls.process = popen_launch_server(
+            cls.model,
+            cls.base_url,
+            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+            other_args=[
+                "--tp",
+                "2",
+                "--trust-remote-code",
+                "--reasoning-parser",
+                "gpt-oss",
+                "--enable-piecewise-cuda-graph",
+            ],
+        )
+
+    @classmethod
+    def tearDownClass(cls):
+        kill_process_tree(cls.process.pid)
+
+    def test_gsm8k(self):
+        args = SimpleNamespace(
+            num_shots=5,
+            data_path=None,
+            num_questions=200,
+            max_new_tokens=512,
+            parallel=128,
+            host="http://127.0.0.1",
+            port=int(self.base_url.split(":")[-1]),
+        )
+        metrics = run_eval(args)
+        print(f"{metrics=}")
+        self.assertGreaterEqual(
+            metrics["accuracy"], ACC_THRESHOLDS[self.model]["gsm8k"]
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()