diff --git a/src/turbomind/models/llama/CMakeLists.txt b/src/turbomind/models/llama/CMakeLists.txt
index 10b93fb9ec..3d05389a31 100644
--- a/src/turbomind/models/llama/CMakeLists.txt
+++ b/src/turbomind/models/llama/CMakeLists.txt
@@ -39,6 +39,7 @@ target_link_libraries(Llama PUBLIC CUDA::cudart
         nccl_utils
         cuda_utils
         logger
+        pycb_utils
         llama_fmha)
 
 if (NOT MSVC)
diff --git a/src/turbomind/models/llama/LlamaBatch.cc b/src/turbomind/models/llama/LlamaBatch.cc
index 83db7ad65d..0ca152c96d 100644
--- a/src/turbomind/models/llama/LlamaBatch.cc
+++ b/src/turbomind/models/llama/LlamaBatch.cc
@@ -9,6 +9,7 @@
 #include "src/turbomind/models/llama/llama_utils.h"
 #include "src/turbomind/utils/Tensor.h"
 #include "src/turbomind/utils/logger.h"
+#include "src/turbomind/utils/pycb_utils.h"
 #include <cstdint>
 #include <iomanip>
 #include <sstream>
@@ -899,8 +900,9 @@ void LlamaBatch<T>::outputContextLogits(T*                      context_decoder_
 
     if (context_logits_buf_ == nullptr) {
         NcclGuard guard(llama_->tensor_para_, stream_, true);
-        context_logits_buf_ = (float*)allocator_->malloc(sizeof(float) * llama_->vocab_size_padded_ * max_context_token_num_);
-        const auto tp       = llama_->tensor_para_.world_size_;
+        context_logits_buf_ =
+            (float*)allocator_->malloc(sizeof(float) * llama_->vocab_size_padded_ * max_context_token_num_);
+        const auto tp = llama_->tensor_para_.world_size_;
         if (tp > 1) {
             FT_CHECK(llama_->vocab_size_padded_ % tp == 0);
             const auto local_vocab_size = llama_->vocab_size_padded_ / tp;
@@ -941,6 +943,7 @@ void LlamaBatch<T>::finish()
     for (int i = 0; i < batch_size_; ++i) {
         FT_CHECK(requests_[i] != nullptr);
         if (requests_[i]->stream_cb && rank_ == 0) {
+            set_batch_info(i, batch_size_);
             requests_[i]->stream_cb(&requests_[i]->outputs[rank_].get());
         }
     }
diff --git a/src/turbomind/python/bind.cpp b/src/turbomind/python/bind.cpp
index 592b2b30e6..982d4914e8 100644
--- a/src/turbomind/python/bind.cpp
+++ b/src/turbomind/python/bind.cpp
@@ -4,6 +4,7 @@
 #include "src/turbomind/triton_backend/transformer_triton_backend.hpp"
 #include "src/turbomind/utils/cuda_utils.h"
 #include "src/turbomind/utils/nccl_utils.h"
+#include "src/turbomind/utils/pycb_utils.h"
 #include <cuda_runtime.h>
 #include <memory>
 #include <pybind11/functional.h>
@@ -329,7 +330,18 @@ PYBIND11_MODULE(_turbomind, m)
         .def(
             "register_callback",
             [](AbstractTransformerModelInstance* self, triton_stream_cb_t cb, py::object ctx) {
-                self->registerCallback(cb, ctx.ptr());
+                auto callback = [=](std::shared_ptr<std::unordered_map<std::string, triton::Tensor>> outputs,
+                                    void*                                                            ctx) {
+                    thread_local PyGILState_STATE gstate;
+                    if (ft::is_first_in_batch()) {
+                        gstate = PyGILState_Ensure();
+                    }
+                    cb(outputs, ctx);
+                    if (ft::is_last_in_batch()) {
+                        PyGILState_Release(gstate);
+                    }
+                };
+                self->registerCallback(callback, ctx.ptr());
             },
             "callback"_a,
             "context"_a = nullptr)
diff --git a/src/turbomind/utils/CMakeLists.txt b/src/turbomind/utils/CMakeLists.txt
index 113ef4f25a..00f83769e6 100644
--- a/src/turbomind/utils/CMakeLists.txt
+++ b/src/turbomind/utils/CMakeLists.txt
@@ -109,3 +109,6 @@ add_library(tensor STATIC Tensor.cc)
 set_property(TARGET tensor PROPERTY POSITION_INDEPENDENT_CODE  ON)
 set_property(TARGET tensor PROPERTY CUDA_RESOLVE_DEVICE_SYMBOLS  ON)
 target_link_libraries(tensor PUBLIC cuda_utils logger)
+
+add_library(pycb_utils STATIC pycb_utils.cc)
+set_property(TARGET pycb_utils PROPERTY POSITION_INDEPENDENT_CODE ON)
diff --git a/src/turbomind/utils/pycb_utils.cc b/src/turbomind/utils/pycb_utils.cc
new file mode 100644
index 0000000000..5fb72d4553
--- /dev/null
+++ b/src/turbomind/utils/pycb_utils.cc
@@ -0,0 +1,31 @@
+// Copyright (c) OpenMMLab. All rights reserved.
+
+#include "pycb_utils.h"
+#include <memory>
+
+namespace turbomind {
+
+thread_local std::shared_ptr<int> _current;
+thread_local std::shared_ptr<int> _total;
+
+void set_batch_info(int current, int total)
+{
+    if (!_current) {
+        _current = std::make_shared<int>();
+        _total   = std::make_shared<int>();
+    }
+    *_current = current;
+    *_total   = total;
+}
+
+int is_first_in_batch()
+{
+    return *_current == 0;
+}
+
+int is_last_in_batch()
+{
+    return *_current == (*_total - 1);
+}
+
+}  // namespace turbomind
diff --git a/src/turbomind/utils/pycb_utils.h b/src/turbomind/utils/pycb_utils.h
new file mode 100644
index 0000000000..45757379b2
--- /dev/null
+++ b/src/turbomind/utils/pycb_utils.h
@@ -0,0 +1,15 @@
+// Copyright (c) OpenMMLab. All rights reserved.
+
+#pragma once
+
+#include <cstdio>
+
+namespace turbomind {
+
+void set_batch_info(int current, int total);
+
+int is_first_in_batch();
+
+int is_last_in_batch();
+
+}  // namespace turbomind