diff --git a/src/common/AutoModel/modeling_nanbeige.cpp b/src/common/AutoModel/modeling_nanbeige.cpp
index edfe7b64b..57c16349c 100644
--- a/src/common/AutoModel/modeling_nanbeige.cpp
+++ b/src/common/AutoModel/modeling_nanbeige.cpp
@@ -295,7 +295,7 @@ NonStreamResult Nanbeige::parse_nstream_content(const std::string response_text)
             size_t brace_end = json_str.rfind("}"); // Find the last closing brace
 
             if (brace_start != std::string::npos && brace_end != std::string::npos && brace_end > brace_start) {
-                arguments = json_str.substr(brace_start, brace_end - brace_start);
+                arguments = json_str.substr(brace_start, brace_end - brace_start + 1);
             }
         }
 
diff --git a/src/common/AutoModel/modeling_qwen2.cpp b/src/common/AutoModel/modeling_qwen2.cpp
index efc027743..50aab3553 100644
--- a/src/common/AutoModel/modeling_qwen2.cpp
+++ b/src/common/AutoModel/modeling_qwen2.cpp
@@ -133,7 +133,7 @@ NonStreamResult Qwen2::parse_nstream_content(const std::string response_text) {
         size_t brace_end = json_str.rfind("}"); // Find the last closing brace
 
         if (brace_start != std::string::npos && brace_end != std::string::npos && brace_end > brace_start) {
-            arguments = json_str.substr(brace_start, brace_end - brace_start);
+            arguments = json_str.substr(brace_start, brace_end - brace_start + 1);
         }
     }
 
diff --git a/src/common/AutoModel/modeling_qwen3.cpp b/src/common/AutoModel/modeling_qwen3.cpp
index 4881e291f..1104179c9 100644
--- a/src/common/AutoModel/modeling_qwen3.cpp
+++ b/src/common/AutoModel/modeling_qwen3.cpp
@@ -148,7 +148,7 @@ NonStreamResult Qwen3::parse_nstream_content(const std::string response_text) {
             size_t brace_end = json_str.rfind("}"); // Find the last closing brace
 
             if (brace_start != std::string::npos && brace_end != std::string::npos && brace_end > brace_start) {
-                arguments = json_str.substr(brace_start, brace_end - brace_start);
+                arguments = json_str.substr(brace_start, brace_end - brace_start + 1);
             }
         }
 
@@ -293,7 +293,7 @@ NonStreamResult Qwen3_IT::parse_nstream_content(const std::string response_text)
         size_t brace_end = json_str.rfind("}"); // Find the last closing brace
 
         if (brace_start != std::string::npos && brace_end != std::string::npos && brace_end > brace_start) {
-            arguments = json_str.substr(brace_start, brace_end - brace_start);
+            arguments = json_str.substr(brace_start, brace_end - brace_start + 1);
         }
     }
 
@@ -497,7 +497,7 @@ NonStreamResult Qwen3_TK::parse_nstream_content(const std::string response_text)
             size_t brace_end = json_str.rfind("}"); // Find the last closing brace
 
             if (brace_start != std::string::npos && brace_end != std::string::npos && brace_end > brace_start) {
-                arguments = json_str.substr(brace_start, brace_end - brace_start);
+                arguments = json_str.substr(brace_start, brace_end - brace_start + 1);
             }
         }
 
diff --git a/src/common/AutoModel/modeling_qwen3_5vl.cpp b/src/common/AutoModel/modeling_qwen3_5vl.cpp
index 0ce0e2a77..87e66fcac 100644
--- a/src/common/AutoModel/modeling_qwen3_5vl.cpp
+++ b/src/common/AutoModel/modeling_qwen3_5vl.cpp
@@ -255,7 +255,7 @@ NonStreamResult Qwen3_5VL::parse_nstream_content(const std::string response_text
         size_t brace_end = json_str.rfind("}"); // Find the last closing brace
 
         if (brace_start != std::string::npos && brace_end != std::string::npos && brace_end > brace_start) {
-            arguments = json_str.substr(brace_start, brace_end - brace_start);
+            arguments = json_str.substr(brace_start, brace_end - brace_start + 1);
         }
     }
 
diff --git a/src/common/AutoModel/modeling_qwen3vl.cpp b/src/common/AutoModel/modeling_qwen3vl.cpp
index 884314b74..221072159 100644
--- a/src/common/AutoModel/modeling_qwen3vl.cpp
+++ b/src/common/AutoModel/modeling_qwen3vl.cpp
@@ -245,7 +245,7 @@ NonStreamResult Qwen3VL::parse_nstream_content(const std::string response_text)
         size_t brace_end = json_str.rfind("}"); // Find the last closing brace
 
         if (brace_start != std::string::npos && brace_end != std::string::npos && brace_end > brace_start) {
-            arguments = json_str.substr(brace_start, brace_end - brace_start);
+            arguments = json_str.substr(brace_start, brace_end - brace_start + 1);
         }
     }