diff --git a/python/sglang/srt/entrypoints/openai/serving_chat.py b/python/sglang/srt/entrypoints/openai/serving_chat.py
index dd73abbb42aa..d0d05e3a483e 100644
--- a/python/sglang/srt/entrypoints/openai/serving_chat.py
+++ b/python/sglang/srt/entrypoints/openai/serving_chat.py
@@ -649,6 +649,7 @@ async def _generate_chat_stream(
 
         # Usage tracking
         prompt_tokens = {}
+        reasoning_tokens = {}
         completion_tokens = {}
         cached_tokens = {}
         hidden_states = {}
@@ -670,6 +671,9 @@ async def _generate_chat_stream(
                 completion_tokens[index] = content["meta_info"].get(
                     "completion_tokens", 0
                 )
+                reasoning_tokens[index] = content["meta_info"].get(
+                    "reasoning_tokens", 0
+                )
                 cached_tokens[index] = content["meta_info"].get("cached_tokens", 0)
                 hidden_states[index] = content["meta_info"].get("hidden_states", None)
                 routed_experts[index] = content["meta_info"].get("routed_experts", None)
@@ -752,6 +756,7 @@ async def _generate_chat_stream(
                         if continuous_usage_stats:
                             chunk.usage = UsageProcessor.calculate_token_usage(
                                 prompt_tokens=prompt_tokens.get(index, 0),
+                                reasoning_tokens=reasoning_tokens.get(index, 0),
                                 completion_tokens=completion_tokens.get(index, 0),
                             )
 
@@ -805,6 +810,7 @@ async def _generate_chat_stream(
                         if continuous_usage_stats:
                             chunk.usage = UsageProcessor.calculate_token_usage(
                                 prompt_tokens=prompt_tokens.get(index, 0),
+                                reasoning_tokens=reasoning_tokens.get(index, 0),
                                 completion_tokens=completion_tokens.get(index, 0),
                             )
 
@@ -885,8 +891,9 @@ async def _generate_chat_stream(
             if include_usage:
                 usage = UsageProcessor.calculate_streaming_usage(
                     prompt_tokens,
+                    reasoning_tokens,
                     completion_tokens,
-                    cached_tokens,
+                    cached_tokens=cached_tokens,
                     n_choices=request.n,
                     enable_cache_report=self.tokenizer_manager.server_args.enable_cache_report,
                 )
@@ -1356,9 +1363,11 @@ async def _process_tool_call_stream(
             if continuous_usage_stats:
                 prompt_tokens = content["meta_info"].get("prompt_tokens", 0)
                 completion_tokens = content["meta_info"].get("completion_tokens", 0)
+                reasoning_tokens = content["meta_info"].get("reasoning_tokens", 0)
                 chunk.usage = UsageProcessor.calculate_token_usage(
                     prompt_tokens=prompt_tokens,
                     completion_tokens=completion_tokens,
+                    reasoning_tokens=reasoning_tokens,
                 )
 
             yield f"data: {chunk.model_dump_json()}\n\n"
@@ -1406,9 +1415,11 @@ async def _process_tool_call_stream(
             if continuous_usage_stats:
                 prompt_tokens = content["meta_info"].get("prompt_tokens", 0)
                 completion_tokens = content["meta_info"].get("completion_tokens", 0)
+                reasoning_tokens = content["meta_info"].get("reasoning_tokens", 0)
                 chunk.usage = UsageProcessor.calculate_token_usage(
                     prompt_tokens=prompt_tokens,
                     completion_tokens=completion_tokens,
+                    reasoning_tokens=reasoning_tokens,
                 )
 
             yield f"data: {chunk.model_dump_json()}\n\n"
diff --git a/python/sglang/srt/entrypoints/openai/serving_completions.py b/python/sglang/srt/entrypoints/openai/serving_completions.py
index d99678fa8fa3..9d089fc3219e 100644
--- a/python/sglang/srt/entrypoints/openai/serving_completions.py
+++ b/python/sglang/srt/entrypoints/openai/serving_completions.py
@@ -220,6 +220,7 @@ async def _generate_completion_stream(
         # Usage tracking
         prompt_tokens = {}
         completion_tokens = {}
+        reasoning_tokens = {}
         cached_tokens = {}
         hidden_states = {}
         routed_experts = {}
@@ -241,6 +242,9 @@ async def _generate_completion_stream(
                 completion_tokens[index] = content["meta_info"].get(
                     "completion_tokens", 0
                 )
+                reasoning_tokens[index] = content["meta_info"].get(
+                    "reasoning_tokens", 0
+                )
                 cached_tokens[index] = content["meta_info"].get("cached_tokens", 0)
                 hidden_states[index] = content["meta_info"].get("hidden_states", None)
                 routed_experts[index] = content["meta_info"].get("routed_experts", None)
@@ -328,6 +332,7 @@ async def _generate_completion_stream(
                     chunk.usage = UsageProcessor.calculate_token_usage(
                         prompt_tokens=prompt_tokens.get(index, 0),
                         completion_tokens=completion_tokens.get(index, 0),
+                        reasoning_tokens=reasoning_tokens.get(index, 0),
                     )
 
                 yield f"data: {chunk.model_dump_json()}\n\n"
@@ -377,8 +382,9 @@ async def _generate_completion_stream(
             if include_usage:
                 usage = UsageProcessor.calculate_streaming_usage(
                     prompt_tokens,
+                    reasoning_tokens,
                     completion_tokens,
-                    cached_tokens,
+                    cached_tokens=cached_tokens,
                     n_choices=request.n,
                     enable_cache_report=self.tokenizer_manager.server_args.enable_cache_report,
                 )
diff --git a/python/sglang/srt/entrypoints/openai/usage_processor.py b/python/sglang/srt/entrypoints/openai/usage_processor.py
index de88e9eb001c..8a6c9d7a29cc 100644
--- a/python/sglang/srt/entrypoints/openai/usage_processor.py
+++ b/python/sglang/srt/entrypoints/openai/usage_processor.py
@@ -23,12 +23,16 @@ def calculate_response_usage(
         completion_tokens = sum(
             r["meta_info"].get("completion_tokens", 0) for r in responses
         )
-
         prompt_tokens = sum(
             responses[i]["meta_info"].get("prompt_tokens", 0)
             for i in range(0, len(responses), n_choices)
         )
 
+        # some API don't have reasoning_tokens semantics
+        reasoning_tokens = sum(
+            r["meta_info"].get("reasoning_tokens", 0) for r in responses
+        )
+
         cached_details = None
         if enable_cache_report:
             cached_total = sum(
@@ -39,6 +43,7 @@ def calculate_response_usage(
 
         return UsageProcessor.calculate_token_usage(
             prompt_tokens=prompt_tokens,
+            reasoning_tokens=reasoning_tokens,
             completion_tokens=completion_tokens,
             cached_tokens=cached_details,
         )
@@ -46,6 +51,7 @@ def calculate_response_usage(
     @staticmethod
     def calculate_streaming_usage(
         prompt_tokens: Mapping[int, int],
+        reasoning_tokens: Mapping[int, int],
         completion_tokens: Mapping[int, int],
         cached_tokens: Mapping[int, int],
         n_choices: int,
@@ -55,6 +61,7 @@ def calculate_streaming_usage(
         total_prompt_tokens = sum(
             tok for idx, tok in prompt_tokens.items() if idx % n_choices == 0
         )
+        total_reasoning_tokens = sum(reasoning_tokens.values())
         total_completion_tokens = sum(completion_tokens.values())
 
         cached_details = (
@@ -67,6 +74,7 @@ def calculate_streaming_usage(
 
         return UsageProcessor.calculate_token_usage(
             prompt_tokens=total_prompt_tokens,
+            reasoning_tokens=total_reasoning_tokens,
             completion_tokens=total_completion_tokens,
             cached_tokens=cached_details,
         )
@@ -75,6 +83,7 @@ def calculate_streaming_usage(
     def calculate_token_usage(
         prompt_tokens: int,
         completion_tokens: int,
+        reasoning_tokens: Optional[int] = 0,
         cached_tokens: Optional[PromptTokensDetails] = None,
     ) -> UsageInfo:
         """Calculate token usage information"""
@@ -83,4 +92,5 @@ def calculate_token_usage(
             completion_tokens=completion_tokens,
             total_tokens=prompt_tokens + completion_tokens,
             prompt_tokens_details=cached_tokens,
+            reasoning_tokens=reasoning_tokens,
         )
diff --git a/python/sglang/srt/managers/detokenizer_manager.py b/python/sglang/srt/managers/detokenizer_manager.py
index ce27113845c7..568699c4ddcd 100644
--- a/python/sglang/srt/managers/detokenizer_manager.py
+++ b/python/sglang/srt/managers/detokenizer_manager.py
@@ -332,6 +332,7 @@ def handle_batch_token_id_out(self, recv_obj: BatchTokenIDOutput):
             output_strs=output_strs,
             output_ids=recv_obj.output_ids,
             prompt_tokens=recv_obj.prompt_tokens,
+            reasoning_tokens=recv_obj.reasoning_tokens,
             completion_tokens=recv_obj.completion_tokens,
             cached_tokens=recv_obj.cached_tokens,
             cached_tokens_details=recv_obj.cached_tokens_details,
diff --git a/python/sglang/srt/managers/io_struct.py b/python/sglang/srt/managers/io_struct.py
index 53a6fc90280e..bd979653458a 100644
--- a/python/sglang/srt/managers/io_struct.py
+++ b/python/sglang/srt/managers/io_struct.py
@@ -974,6 +974,7 @@ class BatchTokenIDOutput(BaseBatchReq, SpeculativeDecodingMetricsMixin):
 
     # Token counts
     prompt_tokens: List[int]
+    reasoning_tokens: List[int]
     completion_tokens: List[int]
     cached_tokens: List[int]
 
@@ -1036,6 +1037,7 @@ class BatchStrOutput(BaseBatchReq, SpeculativeDecodingMetricsMixin):
     # Token counts
     prompt_tokens: List[int]
     completion_tokens: List[int]
+    reasoning_tokens: List[int]
     cached_tokens: List[int]
 
     # Logprobs
diff --git a/python/sglang/srt/managers/multi_tokenizer_mixin.py b/python/sglang/srt/managers/multi_tokenizer_mixin.py
index 4da03863068b..e0a1669fb3e6 100644
--- a/python/sglang/srt/managers/multi_tokenizer_mixin.py
+++ b/python/sglang/srt/managers/multi_tokenizer_mixin.py
@@ -146,6 +146,7 @@ def _handle_output_by_index(output, i):
             no_stop_trim=_extract_field_by_index(output, "no_stop_trim", i),
             prompt_tokens=_extract_field_by_index(output, "prompt_tokens", i),
             completion_tokens=_extract_field_by_index(output, "completion_tokens", i),
+            reasoning_tokens=_extract_field_by_index(output, "reasoning_tokens", i),
             cached_tokens=_extract_field_by_index(output, "cached_tokens", i),
             cached_tokens_details=_extract_field_by_index(
                 output, "cached_tokens_details", i
@@ -224,6 +225,7 @@ def _handle_output_by_index(output, i):
             output_ids=_extract_field_by_index(output, "output_ids", i),
             prompt_tokens=_extract_field_by_index(output, "prompt_tokens", i),
             completion_tokens=_extract_field_by_index(output, "completion_tokens", i),
+            reasoning_tokens=_extract_field_by_index(output, "reasoning_tokens", i),
             cached_tokens=_extract_field_by_index(output, "cached_tokens", i),
             input_token_logprobs_val=_extract_field_by_index(
                 output, "input_token_logprobs_val", i, check_length=False
diff --git a/python/sglang/srt/managers/schedule_batch.py b/python/sglang/srt/managers/schedule_batch.py
index b44c75a5dbee..35858c705a2a 100644
--- a/python/sglang/srt/managers/schedule_batch.py
+++ b/python/sglang/srt/managers/schedule_batch.py
@@ -634,9 +634,13 @@ def __init__(
         # For multi-http worker
         self.http_worker_ipc = http_worker_ipc
 
-        # Require reasoning for the request (hybrid reasoning model only)
+        # Require reasoning for the request
         self.require_reasoning = require_reasoning
 
+        # State indicating whether the reasoning phase has finished (only meaningful when require_reasoning is True)
+        self._is_reasoning_over = False
+        self.reasoning_tokens = 0
+
         # Sampling info
         if isinstance(sampling_params.custom_params, dict):
             sampling_params = copy.copy(sampling_params)
@@ -1276,6 +1280,20 @@ def set_finish_with_abort(self, error_msg: str):
             error_msg, HTTPStatus.BAD_REQUEST, "BadRequestError"
         )
 
+    def update_reasoning_tokens(self, token_id, think_end_id):
+        if self._is_reasoning_over:
+            return
+
+        if not isinstance(token_id, list):
+            token_id = [token_id]
+
+        try:
+            end_pos = token_id.index(think_end_id)
+            self.reasoning_tokens += end_pos + 1
+            self._is_reasoning_over = True
+        except ValueError:
+            self.reasoning_tokens += len(token_id)
+
     def __repr__(self):
         return (
             f"Req(rid={self.rid}, "
diff --git a/python/sglang/srt/managers/scheduler.py b/python/sglang/srt/managers/scheduler.py
index fe3379c95f84..67af2d0de943 100644
--- a/python/sglang/srt/managers/scheduler.py
+++ b/python/sglang/srt/managers/scheduler.py
@@ -552,6 +552,9 @@ def init_tokenizer(self):
             self.tokenizer.think_end_id = self.tokenizer.encode(
                 reasoning_parser.detector.think_end_token, add_special_tokens=False
             )[0]
+            self._think_end_id = self.tokenizer.think_end_id
+        else:
+            self._think_end_id = None
 
     def init_mamba_backend(self) -> None:
         initialize_mamba_selective_state_update_backend(self.server_args)
diff --git a/python/sglang/srt/managers/scheduler_output_processor_mixin.py b/python/sglang/srt/managers/scheduler_output_processor_mixin.py
index e3b8dc87e26d..496cd96656e5 100644
--- a/python/sglang/srt/managers/scheduler_output_processor_mixin.py
+++ b/python/sglang/srt/managers/scheduler_output_processor_mixin.py
@@ -51,7 +51,7 @@ def _get_storage_backend_type(self) -> str:
                 storage_backend_type = type(storage_backend).__name__
         return storage_backend_type
 
-    def _get_cached_tokens_details(self, req: Req) -> Optional[dict]:
+    def _get_cached_tokens_details(self: Scheduler, req: Req) -> Optional[dict]:
         """Get detailed cache breakdown for a request, if available.
 
         Returns:
@@ -182,8 +182,10 @@ def process_batch_result_prefill(
 
                     # req output_ids are set here
                     req.output_ids.append(next_token_id)
-                    req.check_finished()
 
+                    self._maybe_update_reasoning_tokens(req, next_token_id)
+
+                    req.check_finished()
                     if req.finished():
                         self.maybe_collect_routed_experts(req)
                         release_kv_cache(req, self.tree_cache)
@@ -404,6 +406,20 @@ def process_batch_result_decode(
                         v.tolist()
                         for v in logits_output.next_token_token_ids_logprobs_val
                     ]
+        else:
+            # for normal spec decoding: unify next_token_ids format
+            next_token_ids = []
+            cum_num_tokens = 0
+            next_token_ids_list = result.next_token_ids.tolist()
+
+            for i, req in enumerate(batch.reqs):
+                accept_length = result.accept_length_per_req_cpu[i]
+                next_token_ids.append(
+                    next_token_ids_list[
+                        cum_num_tokens : cum_num_tokens + accept_length + 1
+                    ]
+                )
+                cum_num_tokens += accept_length + 1
 
         self.num_generated_tokens += len(batch.reqs)
         if not batch.spec_algorithm.is_none():
@@ -436,6 +452,8 @@ def process_batch_result_decode(
                 req.output_ids.extend(next_token_id)
                 new_accepted_len = len(next_token_id)
 
+            self._maybe_update_reasoning_tokens(req, next_token_id)
+
             # Update Mamba last track seqlen
             self._mamba_prefix_cache_update(req, batch, result, i)
 
@@ -536,8 +554,18 @@ def process_batch_result_decode(
             num_accepted_tokens=result.num_accepted_tokens,
         )
 
+    def _maybe_update_reasoning_tokens(
+        self: Scheduler, req: Req, next_token_id: Union[int, List[int]]
+    ):
+        if req.require_reasoning and self._think_end_id is not None:
+            req.update_reasoning_tokens(next_token_id, self._think_end_id)
+
     def _mamba_prefix_cache_update(
-        self, req: Req, batch: ScheduleBatch, result: GenerationBatchResult, i: int
+        self: Scheduler,
+        req: Req,
+        batch: ScheduleBatch,
+        result: GenerationBatchResult,
+        i: int,
     ) -> None:
         seq_len = len(req.origin_input_ids) + len(req.output_ids) - 1
         if req.mamba_ping_pong_track_buffer is not None:
@@ -571,7 +599,7 @@ def _mamba_prefix_cache_update(
                     )
 
     def _process_input_token_logprobs(
-        self, req: Req, input_token_logprobs: List
+        self: Scheduler, req: Req, input_token_logprobs: List
     ) -> None:
         """Process input token logprobs values and indices."""
         is_multi_item_scoring = self._is_multi_item_scoring(req)
@@ -603,7 +631,7 @@ def _process_input_token_logprobs(
             for x in input_token_logprobs_idx
         ]
 
-    def _process_input_top_logprobs(self, req: Req) -> None:
+    def _process_input_top_logprobs(self: Scheduler, req: Req) -> None:
         """Process input top logprobs."""
         if req.top_logprobs_num <= 0:
             return
@@ -632,7 +660,7 @@ def _process_input_top_logprobs(self, req: Req) -> None:
         req.temp_input_top_logprobs_idx = None
         req.temp_input_top_logprobs_val = None
 
-    def _process_input_token_ids_logprobs(self, req: Req) -> None:
+    def _process_input_token_ids_logprobs(self: Scheduler, req: Req) -> None:
         """Process input token IDs logprobs."""
         if req.token_ids_logprob is None:
             return
@@ -664,7 +692,7 @@ def _process_input_token_ids_logprobs(self, req: Req) -> None:
         req.temp_input_token_ids_logprobs_idx = None
         req.temp_input_token_ids_logprobs_val = None
 
-    def _calculate_relevant_tokens_len(self, req: Req) -> int:
+    def _calculate_relevant_tokens_len(self: Scheduler, req: Req) -> int:
         """Calculate the expected length of logprob arrays based on whether multi-item scoring is enabled.
 
         For multi-item scoring, only delimiter positions have logprobs.
@@ -685,7 +713,7 @@ def _calculate_relevant_tokens_len(self, req: Req) -> int:
             return len(relevant_tokens)
 
     def _calculate_num_input_logprobs(
-        self, req: Req, extend_input_len: int, extend_logprob_start_len: int
+        self: Scheduler, req: Req, extend_input_len: int, extend_logprob_start_len: int
     ) -> int:
         """Calculate the number of input logprobs based on whether multi-item scoring is enabled.
 
@@ -708,7 +736,7 @@ def _calculate_num_input_logprobs(
             # Regular request: all tokens in the range
             return extend_input_len - extend_logprob_start_len
 
-    def _is_multi_item_scoring(self, req: Req) -> bool:
+    def _is_multi_item_scoring(self: Scheduler, req: Req) -> bool:
         """Check if request uses multi-item scoring.
 
         Multi-item scoring applies to prefill-only requests when a delimiter
@@ -845,7 +873,7 @@ def add_logprob_return_values(
 
         return num_input_logprobs
 
-    def _initialize_empty_logprob_containers(self, req: Req) -> None:
+    def _initialize_empty_logprob_containers(self: Scheduler, req: Req) -> None:
         """
         Initialize logprob fields to empty lists if unset.
 
@@ -882,7 +910,7 @@ def stream_output(
                 envs.SGLANG_TEST_CRASH_AFTER_STREAM_OUTPUTS.get()
             )
 
-    def _trigger_crash_for_tests(self, crash_threshold: int):
+    def _trigger_crash_for_tests(self: Scheduler, crash_threshold: int):
         # Crash trigger: crash after stream_output is called N times
         # This is used for testing purposes.
         if not hasattr(self, "_test_stream_output_count"):
@@ -913,6 +941,7 @@ def stream_output_generation(
         spaces_between_special_tokens = []
         no_stop_trim = []
         prompt_tokens = []
+        reasoning_tokens = []
         completion_tokens = []
         cached_tokens = []
         cached_tokens_details = []  # Detailed breakdown by cache source
@@ -1013,6 +1042,7 @@ def stream_output_generation(
                 )
                 no_stop_trim.append(req.sampling_params.no_stop_trim)
                 prompt_tokens.append(len(req.origin_input_ids))
+                reasoning_tokens.append(req.reasoning_tokens)
                 completion_tokens.append(len(output_ids_))
                 cached_tokens.append(req.cached_tokens)
 
@@ -1142,6 +1172,7 @@ def stream_output_generation(
                     spaces_between_special_tokens=spaces_between_special_tokens,
                     no_stop_trim=no_stop_trim,
                     prompt_tokens=prompt_tokens,
+                    reasoning_tokens=reasoning_tokens,
                     completion_tokens=completion_tokens,
                     cached_tokens=cached_tokens,
                     cached_tokens_details=cached_tokens_details,
diff --git a/python/sglang/srt/managers/tokenizer_manager.py b/python/sglang/srt/managers/tokenizer_manager.py
index eca904d8c153..81424329a0c1 100644
--- a/python/sglang/srt/managers/tokenizer_manager.py
+++ b/python/sglang/srt/managers/tokenizer_manager.py
@@ -1574,6 +1574,7 @@ def _handle_batch_output(
             if not isinstance(recv_obj, BatchEmbeddingOutput):
                 meta_info.update(
                     {
+                        "reasoning_tokens": recv_obj.reasoning_tokens[i],
                         "completion_tokens": recv_obj.completion_tokens[i],
                         "cached_tokens": recv_obj.cached_tokens[i],
                     }
diff --git a/python/sglang/srt/speculative/ngram_worker.py b/python/sglang/srt/speculative/ngram_worker.py
index 8c108915c939..098338c5ee5b 100644
--- a/python/sglang/srt/speculative/ngram_worker.py
+++ b/python/sglang/srt/speculative/ngram_worker.py
@@ -215,6 +215,7 @@ def forward_batch_generation(self, batch: ScheduleBatch) -> GenerationBatchResul
         spec_info = model_worker_batch.spec_info
         num_accepted_tokens = 0
         accept_lens = None
+        accept_length_per_req_cpu = None
 
         if model_worker_batch.forward_mode.is_target_verify():
             if batch.has_grammar:
@@ -256,6 +257,7 @@ def forward_batch_generation(self, batch: ScheduleBatch) -> GenerationBatchResul
             logits_output, next_token_ids, num_accepted_tokens = verify_input.verify(
                 batch, logits_output, self.page_size, vocab_mask
             )
+            accept_length_per_req_cpu = verify_input.accept_length.cpu().tolist()
             # Store accept_lens for per-request metrics
             accept_lens = verify_input.accept_length
             if batch.return_logprob:
@@ -277,6 +279,7 @@ def forward_batch_generation(self, batch: ScheduleBatch) -> GenerationBatchResul
             logits_output=logits_output,
             next_token_ids=next_token_ids,
             num_accepted_tokens=num_accepted_tokens,
+            accept_length_per_req_cpu=accept_length_per_req_cpu,
             can_run_cuda_graph=can_run_cuda_graph,
             accept_lens=accept_lens,
         )
diff --git a/test/registered/openai_server/features/test_reasoning_usage_tokens.py b/test/registered/openai_server/features/test_reasoning_usage_tokens.py
new file mode 100644
index 000000000000..d53ef88c440e
--- /dev/null
+++ b/test/registered/openai_server/features/test_reasoning_usage_tokens.py
@@ -0,0 +1,180 @@
+"""Usage:
+python3 -m unittest openai_server.features.test_reasoning_usage_tokens.TestNormalReasoningTokenUsage
+python3 -m unittest openai_server.features.test_reasoning_usage_tokens.TestSpecReasoningTokenUsage
+python3 -m unittest openai_server.features.test_reasoning_usage_tokens.TestSpecV2ReasoningTokenUsage
+"""
+
+import json
+import os
+import unittest
+
+import requests
+from openai import OpenAI
+
+from sglang.srt.parser.reasoning_parser import ReasoningParser
+from sglang.srt.utils import kill_process_tree
+from sglang.srt.utils.hf_transformers_utils import get_tokenizer
+from sglang.test.ci.ci_register import register_cuda_ci
+from sglang.test.test_utils import (
+    DEFAULT_REASONING_MODEL_NAME_FOR_TEST,
+    DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+    DEFAULT_URL_FOR_TEST,
+    CustomTestCase,
+    popen_launch_server,
+)
+
+register_cuda_ci(est_time=90, suite="stage-b-test-1-gpu-large")
+
+
+def remove_prefix(text: str, prefix: str) -> str:
+    return text[len(prefix) :] if text.startswith(prefix) else text
+
+
+class ReasoningTokenUsageMixin:
+    model = ""
+    reasoning_parser_name = ""
+    extra_server_args = []
+    extra_env_vars = {}
+    max_new_tokens = 1024
+
+    @classmethod
+    def setUpClass(cls):
+        for k, v in cls.extra_env_vars.items():
+            os.environ[k] = v
+
+        assert cls.model
+        cls.base_url = DEFAULT_URL_FOR_TEST
+        cls.api_key = "sk-1234"
+
+        # get think_end_token_id
+        cls.tokenizer = get_tokenizer(cls.model)
+        reasoning_parser = ReasoningParser(cls.reasoning_parser_name)
+        cls.think_end_token_id = cls.tokenizer.convert_tokens_to_ids(
+            reasoning_parser.detector.think_end_token
+        )
+        assert (
+            cls.think_end_token_id
+        ), f"think_end_token_id for {cls.reasoning_parser_name} shouldn't be None"
+
+        cls.process = popen_launch_server(
+            cls.model,
+            cls.base_url,
+            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
+            api_key=cls.api_key,
+            other_args=[
+                "--reasoning-parser",
+                cls.reasoning_parser_name,
+            ]
+            + cls.extra_server_args,
+        )
+        cls.client = OpenAI(base_url=f"{cls.base_url}/v1", api_key=cls.api_key)
+        cls.messages = [{"role": "user", "content": "What is 1+3?"}]
+
+    @classmethod
+    def tearDownClass(cls):
+        if hasattr(cls, "process"):
+            kill_process_tree(cls.process.pid)
+
+    def test_generate_api_non_streaming(self):
+        response = requests.post(
+            url=f"{self.base_url}/generate",
+            headers={"Authorization": f"Bearer {self.api_key}"},
+            json={
+                "text": self.tokenizer.apply_chat_template(
+                    self.messages, add_generation_prompt=True, tokenize=False
+                ),
+                "model": self.model,
+                "require_reasoning": True,
+                "sampling_params": {"max_new_tokens": self.max_new_tokens},
+            },
+        )
+        response.raise_for_status()
+        res_json = response.json()
+        report_reasoning_tokens = res_json["meta_info"]["reasoning_tokens"]
+        actual_reasoning_tokens = (
+            res_json["output_ids"].index(self.think_end_token_id) + 1
+        )
+        assert (
+            report_reasoning_tokens == actual_reasoning_tokens
+        ), f"Expected {actual_reasoning_tokens}, got {report_reasoning_tokens}"
+
+    def test_generate_api_streaming(self):
+        response = requests.post(
+            url=f"{self.base_url}/generate",
+            headers={"Authorization": f"Bearer {self.api_key}"},
+            json={
+                "text": self.tokenizer.apply_chat_template(
+                    self.messages, add_generation_prompt=True, tokenize=False
+                ),
+                "model": self.model,
+                "require_reasoning": True,
+                "sampling_params": {"max_new_tokens": 1024},
+                "stream": True,
+            },
+            stream=True,
+        )
+        response.raise_for_status()
+        for chunk in response.iter_lines():
+            if not chunk:
+                continue
+            decoded_str = remove_prefix(chunk.decode("utf-8"), "data: ")
+            if decoded_str != "[DONE]":
+                data = json.loads(decoded_str)
+                report_reasoning_tokens = data["meta_info"]["reasoning_tokens"]
+                if self.think_end_token_id in data["output_ids"]:
+                    actual_reasoning_tokens = (
+                        data["output_ids"].index(self.think_end_token_id) + 1
+                    )
+                else:
+                    actual_reasoning_tokens = len(data["output_ids"])
+                assert report_reasoning_tokens == actual_reasoning_tokens
+
+    def test_chat_api_non_streaming(self):
+        response = self.client.chat.completions.create(
+            model=self.model, messages=self.messages, max_tokens=1024
+        )
+        assert response.usage is not None
+        assert response.usage.reasoning_tokens > 0
+
+    def test_chat_api_streaming(self):
+        response = self.client.chat.completions.create(
+            model=self.model,
+            messages=self.messages,
+            max_tokens=1024,
+            stream=True,
+            stream_options={"include_usage": True, "continuous_usage_stats": True},
+        )
+        for chunk in response:
+            if chunk.usage:
+                assert chunk.usage.reasoning_tokens > 0
+
+
+class TestNormalReasoningTokenUsage(ReasoningTokenUsageMixin, CustomTestCase):
+    model = DEFAULT_REASONING_MODEL_NAME_FOR_TEST
+    reasoning_parser_name = "deepseek-r1"
+    extra_server_args = ["--cuda-graph-max-bs", "2"]
+
+
+class TestSpecReasoningTokenUsage(ReasoningTokenUsageMixin, CustomTestCase):
+    model = "Qwen/Qwen3-30B-A3B"  # select this model due to its suitable eagle model
+    reasoning_parser_name = "qwen3"
+    extra_env_vars = {"SGLANG_ALLOW_OVERWRITE_LONGER_CONTEXT_LEN": "1"}
+    extra_server_args = [
+        "--speculative-algorithm",
+        "EAGLE3",
+        "--speculative-draft-model-path",
+        "nex-agi/SGLANG-EAGLE3-Qwen3-30B-A3B-Nex-N1",
+        "--cuda-graph-max-bs",
+        "2",
+    ]
+
+
+class TestSpecV2ReasoningTokenUsage(TestSpecReasoningTokenUsage):
+    extra_env_vars = {
+        "SGLANG_ALLOW_OVERWRITE_LONGER_CONTEXT_LEN": "1",
+        "SGLANG_ENABLE_SPEC_V2": "1",
+    }
+
+
+if __name__ == "__main__":
+    unittest.main()