diff --git a/src/models/chatglm.cpp b/src/models/chatglm.cpp
index dccffa56..312b35dd 100644
--- a/src/models/chatglm.cpp
+++ b/src/models/chatglm.cpp
@@ -757,7 +757,8 @@ namespace fastllm {
             if (GetVersion() == 1) {
                 positionIds.CopyFrom(Data(DataType::FLOAT32, {2, 1}, {(float) promptLen, (float) (index + 1)}));
             } else {
-                positionIds.CopyFrom(Data(DataType::FLOAT32, {2, 1}, {(float) promptLen + index + 1, (float) (index + 1)}));
+                int gap = add_special_tokens ? 1 : -1;
+                positionIds.CopyFrom(Data(DataType::FLOAT32, {2, 1}, {(float) promptLen + index + gap, (float) (index + gap)}));
             }
         }
     }
diff --git a/tools/src/pytools.cpp b/tools/src/pytools.cpp
index e24e9f7e..ed7b79b7 100644
--- a/tools/src/pytools.cpp
+++ b/tools/src/pytools.cpp
@@ -80,7 +80,7 @@ extern "C" {
     }
 
     DLL_EXPORT fastllm::GenerationConfig make_config(int max_length, bool do_sample, float top_p, int top_k,
-                                          float temperature, float repeat_penalty, bool output_logits) {
+                                          float temperature, float repeat_penalty, bool output_logits, bool add_special_tokens) {
         fastllm::GenerationConfig config;
         config.output_token_limit = max_length;
         config.temperature = temperature;
@@ -90,6 +90,7 @@ extern "C" {
             config.top_k = top_k;
         }
         config.output_logits = output_logits;
+        config.add_special_tokens = add_special_tokens;
         return config;
     }
 
@@ -314,7 +315,7 @@ extern "C" {
                                  int max_length, bool do_sample, float top_p, int top_k,
                                  float temperature, float repeat_penalty, bool output_logits) {
         auto model = models.GetModel(modelId);
-        auto config = make_config(max_length, do_sample, top_p, top_k, temperature, repeat_penalty, output_logits);
+        auto config = make_config(max_length, do_sample, top_p, top_k, temperature, repeat_penalty, output_logits, true);
         std::string s = model->Response(content, nullptr, config);
         return string_to_chars(s);
     }
@@ -329,7 +330,7 @@ extern "C" {
         for (int i = 0; i < v.Count(0); i++) {
             tokens.push_back((int)((float*)v.cpuData)[i]);
         }
-        auto config = make_config(max_length, do_sample, top_p, top_k, temperature, repeat_penalty, output_logits);
+        auto config = make_config(max_length, do_sample, top_p, top_k, temperature, repeat_penalty, output_logits, true);
         for(int i = 0; i < stop_token_len; i++ )
         {
             config.stop_token_ids.insert(stop_token_ids[i]);
@@ -358,7 +359,7 @@ extern "C" {
         for (int i = 0; i < len; i++) {
             input.push_back(values[i]);
         }
-        auto config = make_config(max_length, do_sample, top_p, top_k, temperature, repeat_penalty, output_logits);
+        auto config = make_config(max_length, do_sample, top_p, top_k, temperature, repeat_penalty, output_logits, false);
         for(int i = 0; i < stop_token_len; i++ )
         {
             config.stop_token_ids.insert(stop_token_ids[i]);