diff --git a/scripts/dotnet/OfflineModelConfig.cs b/scripts/dotnet/OfflineModelConfig.cs
index 58b24dbbe..2dc2347c1 100644
--- a/scripts/dotnet/OfflineModelConfig.cs
+++ b/scripts/dotnet/OfflineModelConfig.cs
@@ -23,6 +23,8 @@ public OfflineModelConfig()
             Debug = 0;
             Provider = "cpu";
             ModelType = "";
+            ModelingUnit = "cjkchar";
+            BpeVocab = "";
         }
         public OfflineTransducerModelConfig Transducer;
         public OfflineParaformerModelConfig Paraformer;
@@ -42,5 +44,11 @@ public OfflineModelConfig()
 
         [MarshalAs(UnmanagedType.LPStr)]
         public string ModelType;
+
+        [MarshalAs(UnmanagedType.LPStr)]
+        public string ModelingUnit;
+
+        [MarshalAs(UnmanagedType.LPStr)]
+        public string BpeVocab;
     }
 }
diff --git a/scripts/dotnet/OnlineModelConfig.cs b/scripts/dotnet/OnlineModelConfig.cs
index 1471959d8..dcba23cf8 100644
--- a/scripts/dotnet/OnlineModelConfig.cs
+++ b/scripts/dotnet/OnlineModelConfig.cs
@@ -23,6 +23,8 @@ public OnlineModelConfig()
             Provider = "cpu";
             Debug = 0;
             ModelType = "";
+            ModelingUnit = "cjkchar";
+            BpeVocab = "";
         }
 
         public OnlineTransducerModelConfig Transducer;
@@ -43,5 +45,11 @@ public OnlineModelConfig()
 
         [MarshalAs(UnmanagedType.LPStr)]
         public string ModelType;
+
+        [MarshalAs(UnmanagedType.LPStr)]
+        public string ModelingUnit;
+
+        [MarshalAs(UnmanagedType.LPStr)]
+        public string BpeVocab;
     }
 }
diff --git a/scripts/go/sherpa_onnx.go b/scripts/go/sherpa_onnx.go
index af60d959f..e89787da9 100644
--- a/scripts/go/sherpa_onnx.go
+++ b/scripts/go/sherpa_onnx.go
@@ -87,6 +87,8 @@ type OnlineModelConfig struct {
 	Provider      string // Optional. Valid values are: cpu, cuda, coreml
 	Debug         int    // 1 to show model meta information while loading it.
 	ModelType     string // Optional. You can specify it for faster model initialization
+	ModelingUnit  string // Optional. cjkchar, bpe, cjkchar+bpe
+	BpeVocab      string // Optional.
 }
 
 // Configuration for the feature extractor
@@ -187,6 +189,12 @@ func NewOnlineRecognizer(config *OnlineRecognizerConfig) *OnlineRecognizer {
 	c.model_config.model_type = C.CString(config.ModelConfig.ModelType)
 	defer C.free(unsafe.Pointer(c.model_config.model_type))
 
+	c.model_config.modeling_unit = C.CString(config.ModelConfig.ModelingUnit)
+	defer C.free(unsafe.Pointer(c.model_config.modeling_unit))
+
+	c.model_config.bpe_vocab = C.CString(config.ModelConfig.BpeVocab)
+	defer C.free(unsafe.Pointer(c.model_config.bpe_vocab))
+
 	c.decoding_method = C.CString(config.DecodingMethod)
 	defer C.free(unsafe.Pointer(c.decoding_method))
 
@@ -372,6 +380,9 @@ type OfflineModelConfig struct {
 
 	// Optional. Specify it for faster model initialization.
 	ModelType string
+
+	ModelingUnit string // Optional. cjkchar, bpe, cjkchar+bpe
+	BpeVocab     string // Optional.
 }
 
 // Configuration for the offline/non-streaming recognizer.
@@ -460,6 +471,12 @@ func NewOfflineRecognizer(config *OfflineRecognizerConfig) *OfflineRecognizer {
 	c.model_config.model_type = C.CString(config.ModelConfig.ModelType)
 	defer C.free(unsafe.Pointer(c.model_config.model_type))
 
+	c.model_config.modeling_unit = C.CString(config.ModelConfig.ModelingUnit)
+	defer C.free(unsafe.Pointer(c.model_config.modeling_unit))
+
+	c.model_config.bpe_vocab = C.CString(config.ModelConfig.BpeVocab)
+	defer C.free(unsafe.Pointer(c.model_config.bpe_vocab))
+
 	c.lm_config.model = C.CString(config.LmConfig.Model)
 	defer C.free(unsafe.Pointer(c.lm_config.model))
 
diff --git a/scripts/node-addon-api/src/non-streaming-asr.cc b/scripts/node-addon-api/src/non-streaming-asr.cc
index a1749a47e..d101c7eb6 100644
--- a/scripts/node-addon-api/src/non-streaming-asr.cc
+++ b/scripts/node-addon-api/src/non-streaming-asr.cc
@@ -126,6 +126,8 @@ static SherpaOnnxOfflineModelConfig GetOfflineModelConfig(Napi::Object obj) {
 
   SHERPA_ONNX_ASSIGN_ATTR_STR(provider, provider);
   SHERPA_ONNX_ASSIGN_ATTR_STR(model_type, modelType);
+  SHERPA_ONNX_ASSIGN_ATTR_STR(modeling_unit, modelingUnit);
+  SHERPA_ONNX_ASSIGN_ATTR_STR(bpe_vocab, bpeVocab);
 
   return c;
 }
@@ -232,6 +234,14 @@ CreateOfflineRecognizerWrapper(const Napi::CallbackInfo &info) {
     delete[] c.model_config.model_type;
   }
 
+  if (c.model_config.modeling_unit) {
+    delete[] c.model_config.modeling_unit;
+  }
+
+  if (c.model_config.bpe_vocab) {
+    delete[] c.model_config.bpe_vocab;
+  }
+
   if (c.lm_config.model) {
     delete[] c.lm_config.model;
   }
diff --git a/scripts/node-addon-api/src/streaming-asr.cc b/scripts/node-addon-api/src/streaming-asr.cc
index fec4a46fc..59312a230 100644
--- a/scripts/node-addon-api/src/streaming-asr.cc
+++ b/scripts/node-addon-api/src/streaming-asr.cc
@@ -118,6 +118,8 @@ SherpaOnnxOnlineModelConfig GetOnlineModelConfig(Napi::Object obj) {
   }
 
   SHERPA_ONNX_ASSIGN_ATTR_STR(model_type, modelType);
+  SHERPA_ONNX_ASSIGN_ATTR_STR(modeling_unit, modelingUnit);
+  SHERPA_ONNX_ASSIGN_ATTR_STR(bpe_vocab, bpeVocab);
 
   return c;
 }
@@ -228,6 +230,14 @@ static Napi::External<SherpaOnnxOnlineRecognizer> CreateOnlineRecognizerWrapper(
     delete[] c.model_config.model_type;
   }
 
+  if (c.model_config.modeling_unit) {
+    delete[] c.model_config.modeling_unit;
+  }
+
+  if (c.model_config.bpe_vocab) {
+    delete[] c.model_config.bpe_vocab;
+  }
+
   if (c.decoding_method) {
     delete[] c.decoding_method;
   }
diff --git a/swift-api-examples/SherpaOnnx.swift b/swift-api-examples/SherpaOnnx.swift
index f39d5ebee..0c8d22f3d 100644
--- a/swift-api-examples/SherpaOnnx.swift
+++ b/swift-api-examples/SherpaOnnx.swift
@@ -88,7 +88,9 @@ func sherpaOnnxOnlineModelConfig(
   numThreads: Int = 1,
   provider: String = "cpu",
   debug: Int = 0,
-  modelType: String = ""
+  modelType: String = "",
+  modelingUnit: String = "cjkchar",
+  bpeVocab: String = ""
 ) -> SherpaOnnxOnlineModelConfig {
   return SherpaOnnxOnlineModelConfig(
     transducer: transducer,
@@ -98,7 +100,9 @@ func sherpaOnnxOnlineModelConfig(
     num_threads: Int32(numThreads),
     provider: toCPointer(provider),
     debug: Int32(debug),
-    model_type: toCPointer(modelType)
+    model_type: toCPointer(modelType),
+    modeling_unit: toCPointer(modelingUnit),
+    bpeVocab: toCPointer(bpeVocab)
   )
 }
 
@@ -354,7 +358,9 @@ func sherpaOnnxOfflineModelConfig(
   numThreads: Int = 1,
   provider: String = "cpu",
   debug: Int = 0,
-  modelType: String = ""
+  modelType: String = "",
+  modelingUnit: String = "cjkchar",
+  bpeVocab: String = ""
 ) -> SherpaOnnxOfflineModelConfig {
   return SherpaOnnxOfflineModelConfig(
     transducer: transducer,
@@ -366,7 +372,9 @@ func sherpaOnnxOfflineModelConfig(
     num_threads: Int32(numThreads),
     debug: Int32(debug),
     provider: toCPointer(provider),
-    model_type: toCPointer(modelType)
+    model_type: toCPointer(modelType),
+    modeling_unit: toCPointer(modelingUnit),
+    bpeVocab: toCPointer(bpeVocab)
   )
 }
 
diff --git a/wasm/asr/sherpa-onnx-asr.js b/wasm/asr/sherpa-onnx-asr.js
index d68b22e20..c77794a68 100644
--- a/wasm/asr/sherpa-onnx-asr.js
+++ b/wasm/asr/sherpa-onnx-asr.js
@@ -137,7 +137,7 @@ function initSherpaOnnxOnlineModelConfig(config, Module) {
   const ctc = initSherpaOnnxOnlineZipformer2CtcModelConfig(
       config.zipformer2Ctc, Module);
 
-  const len = transducer.len + paraformer.len + ctc.len + 5 * 4;
+  const len = transducer.len + paraformer.len + ctc.len + 7 * 4;
   const ptr = Module._malloc(len);
 
   let offset = 0;
@@ -153,7 +153,11 @@ function initSherpaOnnxOnlineModelConfig(config, Module) {
   const tokensLen = Module.lengthBytesUTF8(config.tokens) + 1;
   const providerLen = Module.lengthBytesUTF8(config.provider) + 1;
   const modelTypeLen = Module.lengthBytesUTF8(config.modelType) + 1;
-  const bufferLen = tokensLen + providerLen + modelTypeLen;
+  const modelingUnitLen = Module.lengthBytesUTF8(config.modelingUnit || '') + 1;
+  const bpeVocabLen = Module.lengthBytesUTF8(config.bpeVocab || '') + 1;
+
+  const bufferLen =
+      tokensLen + providerLen + modelTypeLen + modelingUnitLen + bpeVocabLen;
   const buffer = Module._malloc(bufferLen);
 
   offset = 0;
@@ -164,6 +168,14 @@ function initSherpaOnnxOnlineModelConfig(config, Module) {
   offset += providerLen;
 
   Module.stringToUTF8(config.modelType, buffer + offset, modelTypeLen);
+  offset += modelTypeLen;
+
+  Module.stringToUTF8(
+      config.modelingUnit || '', buffer + offset, modelingUnitLen);
+  offset += modelingUnitLen;
+
+  Module.stringToUTF8(config.bpeVocab || '', buffer + offset, bpeVocabLen);
+  offset += bpeVocabLen;
 
   offset = transducer.len + paraformer.len + ctc.len;
   Module.setValue(ptr + offset, buffer, 'i8*');  // tokens
@@ -182,6 +194,17 @@ function initSherpaOnnxOnlineModelConfig(config, Module) {
       ptr + offset, buffer + tokensLen + providerLen, 'i8*');  // modelType
   offset += 4;
 
+  Module.setValue(
+      ptr + offset, buffer + tokensLen + providerLen + modelTypeLen,
+      'i8*');  // modelingUnit
+  offset += 4;
+
+  Module.setValue(
+      ptr + offset,
+      buffer + tokensLen + providerLen + modelTypeLen + modelingUnitLen,
+      'i8*');  // bpeVocab
+  offset += 4;
+
   return {
     buffer: buffer, ptr: ptr, len: len, transducer: transducer,
         paraformer: paraformer, ctc: ctc
@@ -317,6 +340,8 @@ function createOnlineRecognizer(Module, myConfig) {
     provider: 'cpu',
     debug: 1,
     modelType: '',
+    modelingUnit: 'cjkchar',
+    bpeVocab: '',
   };
 
   const featureConfig = {
@@ -504,7 +529,7 @@ function initSherpaOnnxOfflineModelConfig(config, Module) {
   const tdnn = initSherpaOnnxOfflineTdnnModelConfig(config.tdnn, Module);
 
   const len = transducer.len + paraformer.len + nemoCtc.len + whisper.len +
-      tdnn.len + 5 * 4;
+      tdnn.len + 7 * 4;
   const ptr = Module._malloc(len);
 
   let offset = 0;
@@ -526,7 +551,11 @@ function initSherpaOnnxOfflineModelConfig(config, Module) {
   const tokensLen = Module.lengthBytesUTF8(config.tokens) + 1;
   const providerLen = Module.lengthBytesUTF8(config.provider) + 1;
   const modelTypeLen = Module.lengthBytesUTF8(config.modelType) + 1;
-  const bufferLen = tokensLen + providerLen + modelTypeLen;
+  const modelingUnitLen = Module.lengthBytesUTF8(config.modelingUnit || '') + 1;
+  const bpeVocabLen = Module.lengthBytesUTF8(config.bpeVocab || '') + 1;
+
+  const bufferLen =
+      tokensLen + providerLen + modelTypeLen + modelingUnitLen + bpeVocabLen;
   const buffer = Module._malloc(bufferLen);
 
   offset = 0;
@@ -537,6 +566,14 @@ function initSherpaOnnxOfflineModelConfig(config, Module) {
   offset += providerLen;
 
   Module.stringToUTF8(config.modelType, buffer + offset, modelTypeLen);
+  offset += modelTypeLen;
+
+  Module.stringToUTF8(
+      config.modelingUnit || '', buffer + offset, modelingUnitLen);
+  offset += modelingUnitLen;
+
+  Module.stringToUTF8(config.bpeVocab || '', buffer + offset, bpeVocabLen);
+  offset += bpeVocabLen;
 
   offset =
       transducer.len + paraformer.len + nemoCtc.len + whisper.len + tdnn.len;
@@ -556,6 +593,17 @@ function initSherpaOnnxOfflineModelConfig(config, Module) {
       ptr + offset, buffer + tokensLen + providerLen, 'i8*');  // modelType
   offset += 4;
 
+  Module.setValue(
+      ptr + offset, buffer + tokensLen + providerLen + modelTypeLen,
+      'i8*');  // modelingUnit
+  offset += 4;
+
+  Module.setValue(
+      ptr + offset,
+      buffer + tokensLen + providerLen + modelTypeLen + modelingUnitLen,
+      'i8*');  // bpeVocab
+  offset += 4;
+
   return {
     buffer: buffer, ptr: ptr, len: len, transducer: transducer,
         paraformer: paraformer, nemoCtc: nemoCtc, whisper: whisper, tdnn: tdnn
diff --git a/wasm/asr/sherpa-onnx-wasm-main-asr.cc b/wasm/asr/sherpa-onnx-wasm-main-asr.cc
index 70d13f1c4..de0cf1430 100644
--- a/wasm/asr/sherpa-onnx-wasm-main-asr.cc
+++ b/wasm/asr/sherpa-onnx-wasm-main-asr.cc
@@ -19,7 +19,7 @@ static_assert(sizeof(SherpaOnnxOnlineZipformer2CtcModelConfig) == 1 * 4, "");
 static_assert(sizeof(SherpaOnnxOnlineModelConfig) ==
                   sizeof(SherpaOnnxOnlineTransducerModelConfig) +
                       sizeof(SherpaOnnxOnlineParaformerModelConfig) +
-                      sizeof(SherpaOnnxOnlineZipformer2CtcModelConfig) + 5 * 4,
+                      sizeof(SherpaOnnxOnlineZipformer2CtcModelConfig) + 7 * 4,
               "");
 static_assert(sizeof(SherpaOnnxFeatureConfig) == 2 * 4, "");
 static_assert(sizeof(SherpaOnnxOnlineCtcFstDecoderConfig) == 2 * 4, "");
@@ -52,6 +52,8 @@ void MyPrint(SherpaOnnxOnlineRecognizerConfig *config) {
   fprintf(stdout, "provider: %s\n", model_config->provider);
   fprintf(stdout, "debug: %d\n", model_config->debug);
   fprintf(stdout, "model type: %s\n", model_config->model_type);
+  fprintf(stdout, "modeling unit: %s\n", model_config->modeling_unit);
+  fprintf(stdout, "bpe vocab: %s\n", model_config->bpe_vocab);
 
   fprintf(stdout, "----------feat config----------\n");
   fprintf(stdout, "sample rate: %d\n", feat->sample_rate);
diff --git a/wasm/nodejs/sherpa-onnx-wasm-nodejs.cc b/wasm/nodejs/sherpa-onnx-wasm-nodejs.cc
index 539699cc4..ceb5a2442 100644
--- a/wasm/nodejs/sherpa-onnx-wasm-nodejs.cc
+++ b/wasm/nodejs/sherpa-onnx-wasm-nodejs.cc
@@ -23,7 +23,7 @@ static_assert(sizeof(SherpaOnnxOfflineModelConfig) ==
                       sizeof(SherpaOnnxOfflineParaformerModelConfig) +
                       sizeof(SherpaOnnxOfflineNemoEncDecCtcModelConfig) +
                       sizeof(SherpaOnnxOfflineWhisperModelConfig) +
-                      sizeof(SherpaOnnxOfflineTdnnModelConfig) + 5 * 4,
+                      sizeof(SherpaOnnxOfflineTdnnModelConfig) + 7 * 4,
               "");
 static_assert(sizeof(SherpaOnnxFeatureConfig) == 2 * 4, "");
 static_assert(sizeof(SherpaOnnxOfflineRecognizerConfig) ==
@@ -90,6 +90,8 @@ void PrintOfflineRecognizerConfig(SherpaOnnxOfflineRecognizerConfig *config) {
   fprintf(stdout, "provider: %s\n", model_config->provider);
   fprintf(stdout, "debug: %d\n", model_config->debug);
   fprintf(stdout, "model type: %s\n", model_config->model_type);
+  fprintf(stdout, "modeling unit: %s\n", model_config->modeling_unit);
+  fprintf(stdout, "bpe vocab: %s\n", model_config->bpe_vocab);
 
   fprintf(stdout, "----------feat config----------\n");
   fprintf(stdout, "sample rate: %d\n", feat->sample_rate);