diff --git a/python/sglang/api.py b/python/sglang/api.py
index 2242b4a4c6a..887ffce76e6 100644
--- a/python/sglang/api.py
+++ b/python/sglang/api.py
@@ -62,6 +62,7 @@ def gen(
     name: Optional[str] = None,
     max_tokens: Optional[int] = None,
     stop: Optional[Union[str, List[str]]] = None,
+    stop_token_ids: Optional[List[int]] = None,
     temperature: Optional[float] = None,
     top_p: Optional[float] = None,
     top_k: Optional[int] = None,
@@ -98,6 +99,7 @@ def gen(
         name,
         max_tokens,
         stop,
+        stop_token_ids,
         temperature,
         top_p,
         top_k,
@@ -117,6 +119,7 @@ def gen_int(
     name: Optional[str] = None,
     max_tokens: Optional[int] = None,
     stop: Optional[Union[str, List[str]]] = None,
+    stop_token_ids: Optional[List[int]] = None,
     temperature: Optional[float] = None,
     top_p: Optional[float] = None,
     top_k: Optional[int] = None,
@@ -132,6 +135,7 @@ def gen_int(
         name,
         max_tokens,
         stop,
+        stop_token_ids,
         temperature,
         top_p,
         top_k,
@@ -151,6 +155,7 @@ def gen_string(
     name: Optional[str] = None,
     max_tokens: Optional[int] = None,
     stop: Optional[Union[str, List[str]]] = None,
+    stop_token_ids: Optional[List[int]] = None,
     temperature: Optional[float] = None,
     top_p: Optional[float] = None,
     top_k: Optional[int] = None,
@@ -166,6 +171,7 @@ def gen_string(
         name,
         max_tokens,
         stop,
+        stop_token_ids,
         temperature,
         top_p,
         top_k,
diff --git a/python/sglang/lang/interpreter.py b/python/sglang/lang/interpreter.py
index cf53fac3035..844c9d062b8 100644
--- a/python/sglang/lang/interpreter.py
+++ b/python/sglang/lang/interpreter.py
@@ -20,7 +20,6 @@
     SglConstantText,
     SglExpr,
     SglExprList,
-    SglFunction,
     SglGen,
     SglImage,
     SglRoleBegin,
@@ -181,8 +180,10 @@ def __init__(
         num_api_spec_tokens=None,
         use_thread=True,
     ):
+        from sglang.lang.backend.base_backend import BaseBackend
+
         self.sid = uuid.uuid4().hex
-        self.backend = backend
+        self.backend: BaseBackend = backend
         self.arguments: Dict[str, Any] = arguments
         self.default_sampling_para = default_sampling_para
         self.stream = stream
@@ -658,6 +659,7 @@ def _resolve_sampling_params(self, sampling_params):
         for item in [
             "max_new_tokens",
             "stop",
+            "stop_token_ids",
             "temperature",
             "top_p",
             "top_k",
diff --git a/python/sglang/lang/ir.py b/python/sglang/lang/ir.py
index 0166b86870f..9db5f2719ea 100644
--- a/python/sglang/lang/ir.py
+++ b/python/sglang/lang/ir.py
@@ -18,6 +18,7 @@
 class SglSamplingParams:
     max_new_tokens: int = 128
     stop: Union[str, List[str]] = ()
+    stop_token_ids: Optional[List[int]] = ()
     temperature: float = 1.0
     top_p: float = 1.0
     top_k: int = -1  # -1 means disable
@@ -37,6 +38,7 @@ def clone(self):
         return SglSamplingParams(
             self.max_new_tokens,
             self.stop,
+            self.stop_token_ids,
             self.temperature,
             self.top_p,
             self.top_k,
@@ -108,6 +110,7 @@ def to_srt_kwargs(self):
         return {
             "max_new_tokens": self.max_new_tokens,
             "stop": self.stop,
+            "stop_token_ids": self.stop_token_ids,
             "temperature": self.temperature,
             "top_p": self.top_p,
             "top_k": self.top_k,
@@ -141,7 +144,8 @@ def run(
         self,
         *args,
         max_new_tokens: int = 128,
-        stop: Union[str, List[str]] = (),
+        stop: Union[str, List[str]] = [],
+        stop_token_ids: Optional[List[int]] = [],
         temperature: float = 1.0,
         top_p: float = 1.0,
         top_k: int = -1,
@@ -161,6 +165,7 @@ def run(
         default_sampling_para = SglSamplingParams(
             max_new_tokens=max_new_tokens,
             stop=stop,
+            stop_token_ids=stop_token_ids,
             temperature=temperature,
             top_p=top_p,
             top_k=top_k,
@@ -181,6 +186,7 @@ def run_batch(
         *,
         max_new_tokens: int = 128,
         stop: Union[str, List[str]] = (),
+        stop_token_ids: Optional[List[int]] = [],
         temperature: float = 1.0,
         top_p: float = 1.0,
         top_k: int = -1,
@@ -218,6 +224,7 @@ def run_batch(
         default_sampling_para = SglSamplingParams(
             max_new_tokens=max_new_tokens,
             stop=stop,
+            stop_token_ids=stop_token_ids,
             temperature=temperature,
             top_p=top_p,
             top_k=top_k,
@@ -397,6 +404,7 @@ def __init__(
         name: Optional[str] = None,
         max_new_tokens: Optional[int] = None,
         stop: Optional[Union[str, List[str]]] = None,
+        stop_token_ids: Optional[List[int]] = None,
         temperature: Optional[float] = None,
         top_p: Optional[float] = None,
         top_k: Optional[int] = None,
@@ -416,6 +424,7 @@ def __init__(
         self.sampling_params = SglSamplingParams(
             max_new_tokens=max_new_tokens,
             stop=stop,
+            stop_token_ids=stop_token_ids,
             temperature=temperature,
             top_p=top_p,
             top_k=top_k,
diff --git a/python/sglang/srt/managers/schedule_batch.py b/python/sglang/srt/managers/schedule_batch.py
index 9037f5a6eac..9e86c9b1880 100644
--- a/python/sglang/srt/managers/schedule_batch.py
+++ b/python/sglang/srt/managers/schedule_batch.py
@@ -235,10 +235,12 @@ def check_finished(self):
             return
 
         last_token_id = self.output_ids[-1]
-        if self.tokenizer is None:
-            matched_eos = last_token_id in self.sampling_params.stop_token_ids
-        else:
-            matched_eos = last_token_id == self.tokenizer.eos_token_id
+
+        matched_eos = last_token_id in self.sampling_params.stop_token_ids
+
+        if self.tokenizer is not None:
+            matched_eos |= last_token_id == self.tokenizer.eos_token_id
+
         if matched_eos and not self.sampling_params.ignore_eos:
             self.finished_reason = FINISH_MATCHED_TOKEN(matched=last_token_id)
             return
diff --git a/python/sglang/test/test_programs.py b/python/sglang/test/test_programs.py
index 6e39f0aa995..ce402558550 100644
--- a/python/sglang/test/test_programs.py
+++ b/python/sglang/test/test_programs.py
@@ -106,13 +106,16 @@ def decode_json(s):
         from sglang.lang.ir import REGEX_FLOAT, REGEX_INT, REGEX_STR
 
         s += "Generate a JSON object to describe the basic city information of Paris.\n"
+        s += "Here are the JSON object:\n"
+
+        # NOTE: we recommend using dtype gen or whole regex string to control the output
 
         with s.var_scope("json_output"):
             s += "{\n"
-            s += '  "name": ' + sgl.gen(regex=REGEX_STR + ",") + "\n"
-            s += '  "population": ' + sgl.gen(regex=REGEX_INT + ",") + "\n"
-            s += '  "area": ' + sgl.gen(regex=REGEX_INT + ",") + "\n"
-            s += '  "latitude": ' + sgl.gen(regex=REGEX_FLOAT) + "\n"
+            s += '  "name": ' + sgl.gen(regex=REGEX_STR) + ",\n"
+            s += '  "population": ' + sgl.gen(regex=REGEX_INT, stop=[" ", "\n"]) + ",\n"
+            s += '  "area": ' + sgl.gen(regex=REGEX_INT, stop=[" ", "\n"]) + ",\n"
+            s += '  "latitude": ' + sgl.gen(regex=REGEX_FLOAT, stop=[" ", "\n"]) + "\n"
             s += "}"
 
     ret = decode_json.run(temperature=0.0)
diff --git a/test/srt/test_moe_serving_throughput.py b/test/srt/test_moe_serving_throughput.py
index 713eba7abb8..80b445f490f 100644
--- a/test/srt/test_moe_serving_throughput.py
+++ b/test/srt/test_moe_serving_throughput.py
@@ -84,7 +84,7 @@ def test_default_without_radix_cache(self):
 
         if os.getenv("SGLANG_IS_IN_CI", "false") == "true":
             # A100 (PCIE) performance
-            assert res["output_throughput"] > 940
+            assert res["output_throughput"] > 930
 
     def test_default_with_chunked_prefill(self):
         res = self.run_test(