diff --git a/python/sglang/srt/layers/rotary_embedding.py b/python/sglang/srt/layers/rotary_embedding.py
index ad265830f..7093bb90d 100644
--- a/python/sglang/srt/layers/rotary_embedding.py
+++ b/python/sglang/srt/layers/rotary_embedding.py
@@ -6,9 +6,15 @@ from typing import Any, Dict, List, Optional, Tuple, Union
 
 import torch
 import torch.nn as nn
+from vllm import _custom_ops as ops
 from vllm.model_executor.custom_op import CustomOp
 
 from sglang.srt.layers.custom_op_util import register_custom_op
+from sglang.srt.utils import is_cuda_available
+
+_is_cuda_available = is_cuda_available()
+if _is_cuda_available:
+    from sgl_kernel import apply_rope_with_cos_sin_cache_inplace
 
 
 def _rotate_neox(x: torch.Tensor) -> torch.Tensor:
@@ -75,7 +81,9 @@ class RotaryEmbedding(CustomOp):
         self.dtype = dtype
 
         cache = self._compute_cos_sin_cache()
-        cache = cache.to(dtype)
+        # NOTE(ByronHsu): cache needs to be in FP32 for numerical stability
+        if not _is_cuda_available:
+            cache = cache.to(dtype)
         self.cos_sin_cache: torch.Tensor
         self.register_buffer("cos_sin_cache", cache, persistent=False)
 
@@ -141,17 +149,25 @@ class RotaryEmbedding(CustomOp):
         key: torch.Tensor,
         offsets: Optional[torch.Tensor] = None,
     ) -> Tuple[torch.Tensor, torch.Tensor]:
-        from vllm import _custom_ops as ops
-
-        self.cos_sin_cache = self.cos_sin_cache.to(query.device, dtype=query.dtype)
-        ops.rotary_embedding(
-            positions,
-            query,
-            key,
-            self.head_size,
-            self.cos_sin_cache,
-            self.is_neox_style,
-        )
+        if _is_cuda_available:
+            apply_rope_with_cos_sin_cache_inplace(
+                positions=positions,
+                query=query,
+                key=key,
+                head_size=self.head_size,
+                cos_sin_cache=self.cos_sin_cache,
+                is_neox=self.is_neox_style,
+            )
+        else:
+            self.cos_sin_cache = self.cos_sin_cache.to(query.device, dtype=query.dtype)
+            ops.rotary_embedding(
+                positions,
+                query,
+                key,
+                self.head_size,
+                self.cos_sin_cache,
+                self.is_neox_style,
+            )
         return query, key
 
     def forward_xpu(
diff --git a/test/srt/test_session_control.py b/test/srt/test_session_control.py
index 5653e9b69..2915133f4 100644
--- a/test/srt/test_session_control.py
+++ b/test/srt/test_session_control.py
@@ -54,6 +54,7 @@ class TestSessionControl(unittest.TestCase):
                 chunks_ids[i] = chunks_ids[i][1:]
 
         # 1. using session control
+        requests.post(self.base_url + "/flush_cache")
         session_id = requests.post(
             self.base_url + "/open_session",
             json={"capacity_of_str_len": 1000},
@@ -215,7 +216,9 @@ class TestSessionControl(unittest.TestCase):
         print(outputs_from_session)
         print("outputs from normal queries:")
         print(outputs_normal)
-        assert outputs_from_session == outputs_normal
+        assert (
+            outputs_from_session == outputs_normal
+        ), f"outputs_from_session: {outputs_from_session}, outputs_normal: {outputs_normal}"
 
     async def async_generate(self, payload):
         url = self.base_url + "/generate"
@@ -250,6 +253,7 @@ class TestSessionControl(unittest.TestCase):
                 chunks_ids[i] = chunks_ids[i][1:]
 
         # 1. using session control
+        requests.post(self.base_url + "/flush_cache")
         session_id = requests.post(
             self.base_url + "/open_session",
             json={"capacity_of_str_len": 1000},
@@ -320,6 +324,7 @@ class TestSessionControl(unittest.TestCase):
             assert response["meta_info"]["finish_reason"]["type"] == "abort"
         else:
             # 2. not using session control
+            requests.post(self.base_url + "/flush_cache")
             output_ids = tokenizer.encode(gen_so_far)
             if output_ids[0] == tokenizer.bos_token_id:
                 output_ids = output_ids[1:]
@@ -342,7 +347,9 @@ class TestSessionControl(unittest.TestCase):
             output_no_session = response["text"]
             print("second request output without session:")
             print(output_no_session)
-            assert second_output == output_no_session
+            assert (
+                second_output == output_no_session
+            ), f"second_output: {second_output}, output_no_session: {output_no_session}"
 
     def test_session_control_backtrack_with_abort(self):
         asyncio.run(self.run_session_control_backtrack_with_abort(replace=True))
@@ -355,6 +362,7 @@ class TestSessionControl(unittest.TestCase):
             assert len(x) == len(chunks_per_step[0])
 
         # 1. using session control
+        requests.post(self.base_url + "/flush_cache")
         session_id = requests.post(
             self.base_url + "/open_session",
             json={"capacity_of_str_len": 1000},
@@ -459,7 +467,9 @@ class TestSessionControl(unittest.TestCase):
         print(outputs_from_session)
         print("====== outputs from normal queries: =======")
         print(outputs_normal)
-        assert outputs_from_session == outputs_normal
+        assert (
+            outputs_from_session == outputs_normal
+        ), f"outputs_from_session: {outputs_from_session}, outputs_normal: {outputs_normal}"
 
     def test_session_control_with_branching(self):
         root_prompt = "First, let me explain in one sentence about AI"
@@ -525,6 +535,7 @@ class TestSessionControlVision(unittest.TestCase):
         gen_len = 32
 
         # 1. using session control
+        requests.post(self.base_url + "/flush_cache")
         session_id = requests.post(
             self.base_url + "/open_session",
             json={"capacity_of_str_len": 1000},
@@ -691,7 +702,9 @@ class TestSessionControlVision(unittest.TestCase):
         print(outputs_from_session)
         print("outputs from normal queries:")
         print(outputs_normal)
-        assert outputs_from_session == outputs_normal
+        assert (
+            outputs_from_session == outputs_normal
+        ), f"outputs_from_session: {outputs_from_session}, outputs_normal: {outputs_normal}"
 
 
 if __name__ == "__main__":