diff --git a/python/sglang/test/accuracy_test_runner.py b/python/sglang/test/accuracy_test_runner.py
index 158275d4e..6ea30a03b 100644
--- a/python/sglang/test/accuracy_test_runner.py
+++ b/python/sglang/test/accuracy_test_runner.py
@@ -26,6 +26,7 @@ class AccuracyTestParams:
     # Extended parameters for special evaluations (e.g., GPQA with thinking mode)
     thinking_mode: Optional[str] = None  # e.g., "deepseek-v3"
     temperature: Optional[float] = None
+    top_p: Optional[float] = None
     repeat: Optional[int] = None
 
 
@@ -81,6 +82,7 @@ def _run_simple_eval(
     return_latency: bool = False,
     thinking_mode: Optional[str] = None,
     temperature: Optional[float] = None,
+    top_p: Optional[float] = None,
     repeat: Optional[int] = None,
 ) -> Tuple[bool, Optional[str], Optional[dict]]:
     """Run evaluation using simple_eval backend (run_eval.py).
@@ -117,6 +119,9 @@ def _run_simple_eval(
         if temperature is not None:
             args.temperature = temperature
 
+        if top_p is not None:
+            args.top_p = top_p
+
         if repeat is not None:
             args.repeat = repeat
 
@@ -212,7 +217,13 @@ def run_accuracy_test(
     print(f"{'='*60}\n")
 
     # Run evaluation based on dataset type
-    if params.dataset == "gsm8k":
+    # Use few_shot_eval for gsm8k by default for backward compatibility.
+    # Use simple_eval when any extended params are set that few_shot_eval doesn't support.
+    has_extended_params = any(
+        getattr(params, field) is not None
+        for field in ("thinking_mode", "temperature", "top_p", "repeat")
+    )
+    if params.dataset == "gsm8k" and not has_extended_params:
         success, error, metrics = _run_few_shot_eval(
             model=model,
             base_url=base_url,
@@ -230,6 +241,7 @@ def run_accuracy_test(
             return_latency=params.return_latency,
             thinking_mode=params.thinking_mode,
             temperature=params.temperature,
+            top_p=params.top_p,
             repeat=params.repeat,
         )
 
diff --git a/test/registered/8-gpu-models/test_ring_2_5_1t.py b/test/registered/8-gpu-models/test_ring_2_5_1t.py
new file mode 100644
index 000000000..b686aa51c
--- /dev/null
+++ b/test/registered/8-gpu-models/test_ring_2_5_1t.py
@@ -0,0 +1,53 @@
+import unittest
+
+from sglang.test.accuracy_test_runner import AccuracyTestParams
+from sglang.test.ci.ci_register import register_cuda_ci
+from sglang.test.run_combined_tests import run_combined_tests
+from sglang.test.test_utils import ModelLaunchSettings
+
+# register_cuda_ci(est_time=1000, suite="nightly-8-gpu-common", nightly=True)
+register_cuda_ci(est_time=1000, suite="stage-c-test-8-gpu-h200")
+
+RING_2_5_1T_MODEL_PATH = "inclusionAI/Ring-2.5-1T"
+
+
+class TestRing2_5_1T(unittest.TestCase):
+    """Accuracy test for Ring-2.5-1T.
+
+    Ring-2.5-1T is a ~1T MoE model with linear attention layers.
+    Uses TP=8 for GSM8K evaluation.
+    """
+
+    def test_ring_2_5_1t(self):
+        base_args = [
+            "--tp=8",
+            "--trust-remote-code",
+            "--model-loader-extra-config",
+            '{"enable_multithread_load": true, "num_threads": 64}',
+        ]
+
+        variants = [
+            ModelLaunchSettings(
+                RING_2_5_1T_MODEL_PATH,
+                tp_size=8,
+                extra_args=base_args,
+                variant="TP8",
+            ),
+        ]
+
+        run_combined_tests(
+            models=variants,
+            test_name="Ring-2.5-1T",
+            accuracy_params=AccuracyTestParams(
+                dataset="gsm8k",
+                num_examples=200,
+                baseline_accuracy=0.88,
+                temperature=1.2,
+                top_p=0.8,
+                max_tokens=4096,
+            ),
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()