tencent / Hunyuan-A13B-Instruct

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Welcome to the official repository of Hunyuan-A13B , an innovative and open-source large language model (LLM) built on a fine-grained Mixture-of-Experts (MoE) architecture. Designed for efficiency and scalability, Hunyuan-A13B delivers cutting-edge performance with minimal computational overhead, making it an ideal choice for advanced reasoning and general-purpose applications, especially in resource-constrained environments.

Model Introduction

With the rapid advancement of artificial intelligence technology, large language models (LLMs) have achieved remarkable progress in natural language processing, computer vision, and scientific tasks. However, as model scales continue to expand, optimizing resource consumption while maintaining high performance has become a critical challenge. To address this, we have explored Mixture of Experts (MoE) architectures. The newly introduced Hunyuan-A13B model features a total of 80 billion parameters with 13 billion active parameters. It not only delivers high-performance results but also achieves optimal resource efficiency, successfully balancing computational power and resource utilization.

Key Features and Advantages

• Compact yet Powerful : With only 13 billion active parameters (out of a total of 80 billion), the model delivers competitive performance on a wide range of benchmark tasks, rivaling much larger models.
• Hybrid Inference Support : Supports both fast and slow thinking modes, allowing users to flexibly choose according to their needs.
• Ultra-Long Context Understanding : Natively supports a 256K context window, maintaining stable performance on long-text tasks.
• Enhanced Agent Capabilities : Optimized for agent tasks, achieving leading results on benchmarks such as BFCL-v3 and τ-Bench.
• Efficient Inference : Utilizes Grouped Query Attention (GQA) and supports multiple quantization formats, enabling highly efficient inference.

Why Choose Hunyuan-A13B?

As a powerful yet computationally efficient large model, Hunyuan-A13B is an ideal choice for researchers and developers seeking high performance under resource constraints. Whether for academic research, cost-effective AI solution development, or innovative application exploration, this model provides a robust foundation for advancement.

Related News

• 2025.6.27 We have open-sourced Hunyuan-A13B-Pretrain , Hunyuan-A13B-Instruct , Hunyuan-A13B-Instruct-FP8 , Hunyuan-A13B-Instruct-GPTQ-Int4 on Hugging Face.
  

Benchmark

Note: The following benchmarks are evaluated by TRT-LLM-backend

Hunyuan-A13B-Instruct has achieved highly competitive performance across multiple benchmarks, particularly in mathematics, science, agent domains, and more. We compared it with several powerful models, and the results are shown below.

Use with transformers

Below is an example of how to use this model with the Hugging Face transformers library. This includes loading the model and tokenizer, toggling reasoning (thinking) mode, and parsing both the reasoning process and final answer from the output.

from transformers import AutoModelForCausalLM, AutoTokenizer
import os
import re

model_name_or_path = os.environ['MODEL_PATH']
# model_name_or_path = "tencent/Hunyuan-A13B-Instruct"

tokenizer = AutoTokenizer.from_pretrained(model_name_or_path, trust_remote_code=True)
model = AutoModelForCausalLM.from_pretrained(model_name_or_path,
                                            device_map="auto",trust_remote_code=True)  # You may want to use bfloat16 and/or move to GPU here

messages = [
    {"role": "user", "content": "Write a short summary of the benefits of regular exercise"},
]

tokenized_chat = tokenizer.apply_chat_template(
        messages,
        tokenize=True,
        add_generation_prompt=True,
        return_tensors="pt",
        enable_thinking=True # Toggle thinking mode (default: True)
        )
                                                
outputs = model.generate(tokenized_chat.to(model.device), max_new_tokens=4096)

output_text = tokenizer.decode(outputs[0])

think_pattern = r'<think>(.*?)</think>'
think_matches = re.findall(think_pattern, output_text, re.DOTALL)

answer_pattern = r'<answer>(.*?)</answer>'
answer_matches = re.findall(answer_pattern, output_text, re.DOTALL)

think_content = [match.strip() for match in think_matches][0]
answer_content = [match.strip() for match in answer_matches][0]
print(f"thinking_content:{think_content}\n\n")
print(f"answer_content:{answer_content}\n\n")

Fast and slow thinking switch

This model supports two modes of operation:

• Slow Thinking Mode (Default): Enables detailed internal reasoning steps before producing the final answer.
• Fast Thinking Mode: Skips the internal reasoning process for faster inference, going straight to the final answer.

Switching to Fast Thinking Mode:

To disable the reasoning process, set enable_thinking=False in the apply_chat_template call:

tokenized_chat = tokenizer.apply_chat_template(
    messages,
    tokenize=True,
    add_generation_prompt=True,
    return_tensors="pt",
    enable_thinking=False  # Use fast thinking mode
)

Quantitative Compression

We used our own AngleSlim compression tool to produce FP8 and INT4 quantization models. AngleSlim compression tool is expected to be open source in early July, which will support one-click quantization and compression of large models, please look forward to it, and you can download our quantization models directly for deployment testing now.

FP8 Quantization

We use FP8-static quantization, FP8 quantization adopts 8-bit floating point format, through a small amount of calibration data (without training) to pre-determine the quantization scale, the model weights and activation values will be converted to FP8 format, to improve the inference efficiency and reduce the deployment threshold. We you can use AngleSlim quantization, you can also directly download our quantization completed open source model to use Hunyuan-A13B-Instruct-FP8 .

FP8 Benchmark

This subsection describes the Benchmark metrics for the Hunyuan-80B-A13B-Instruct-FP8 quantitative model.

Int4 Quantization

We use the GPTQ algorithm to achieve W4A16 quantization, which processes the model weights layer by layer, uses a small amount of calibration data to minimize the reconfiguration error of the quantized weights, and adjusts the weights layer by layer by the optimization process of approximating the Hessian inverse matrix. The process eliminates the need to retrain the model and requires only a small amount of calibration data to quantize the weights, improving inference efficiency and lowering the deployment threshold. You can use AngleSlim quantization, you can also directly download our quantization completed open source model to use Hunyuan-A13B-Instruct-Int4 .

Int4 Benchmark

This subsection describes the Benchmark metrics for the Hunyuan-80B-A13B-Instruct-GPTQ-Int4 quantitative model.

Deployment

For deployment, you can use frameworks such as TensorRT-LLM , vLLM , or SGLang to serve the model and create an OpenAI-compatible API endpoint.

image: https://hub.docker.com/r/hunyuaninfer/hunyuan-a13b/tags

TensorRT-LLM

Docker Image

We provide a pre-built Docker image based on the latest version of TensorRT-LLM.

• To get started:

https://hub.docker.com/r/hunyuaninfer/hunyuan-large/tags

docker pull hunyuaninfer/hunyuan-a13b:hunyuan-moe-A13B-trtllm

• Start the API server:

docker run --name hunyuanLLM_infer --rm -it --ipc=host --ulimit memlock=-1 --ulimit stack=67108864 --gpus=all hunyuaninfer/hunyuan-a13b:hunyuan-moe-A13B-trtllm

trtllm-serve \
  /path/to/HunYuan-moe-A13B \
  --host localhost \
  --port 8000 \
  --backend pytorch \
  --max_batch_size 128 \
  --max_num_tokens 16384 \
  --tp_size 2 \
  --kv_cache_free_gpu_memory_fraction 0.95 \
  --extra_llm_api_options /path/to/extra-llm-api-config.yml

vLLM

Docker Image

We provide a pre-built Docker image containing vLLM 0.8.5 with full support for this model. The official vllm release is currently under development， note: cuda 12.8 is require for this docker .

• To get started:

docker pull docker.cnb.cool/tencent/hunyuan/hunyuan-a13b:hunyuan-moe-A13B-vllm 
or
docker pull hunyuaninfer/hunyuan-a13b:hunyuan-moe-A13B-vllm

• Download Model file:

  • Huggingface: will download automicly by vllm.
  • ModelScope: modelscope download --model Tencent-Hunyuan/Hunyuan-A13B-Instruct

• Start the API server:

model download by huggingface:

docker run  --privileged --user root  --net=host --ipc=host \
        -v ~/.cache:/root/.cache/ \
        --gpus=all -it --entrypoint python  hunyuaninfer/hunyuan-a13b:hunyuan-moe-A13B-vllm
 \
         -m vllm.entrypoints.openai.api_server --host 0.0.0.0 --port 8000 \
         --tensor-parallel-size 4 --model tencent/Hunyuan-A13B-Instruct --trust-remote-code 

model downloaded by modelscope:

docker run  --privileged --user root  --net=host --ipc=host \
        -v ~/.cache/modelscope:/root/.cache/modelscope \
        --gpus=all -it --entrypoint python   hunyuaninfer/hunyuan-a13b:hunyuan-moe-A13B-vllm \
         -m vllm.entrypoints.openai.api_server --host 0.0.0.0 --tensor-parallel-size 4 --port 8000 \ 
         --model /root/.cache/modelscope/hub/models/Tencent-Hunyuan/Hunyuan-A13B-Instruct/ --trust_remote_code  

Tool Calling with vLLM

To support agent-based workflows and function calling capabilities, this model includes specialized parsing mechanisms for handling tool calls and internal reasoning steps.

For a complete working example of how to implement and use these features in an agent setting, please refer to our full agent implementation on GitHub:
🔗 Hunyuan A13B Agent Example

When deploying the model using vLLM , the following parameters can be used to configure the tool parsing behavior:

These settings enable vLLM to correctly interpret and route tool calls generated by the model according to the expected format.

SGLang

Docker Image

We also provide a pre-built Docker image based on the latest version of SGLang.

To get started:

• Pull the Docker image

docker pull docker.cnb.cool/tencent/hunyuan/hunyuan-a13b:hunyuan-moe-A13B-sglang
or
docker pull hunyuaninfer/hunyuan-a13b:hunyuan-moe-A13B-sglang

• Start the API server:

docker run --gpus all \
    --shm-size 32g \
    -p 30000:30000 \
    --ipc=host \
    docker.cnb.cool/tencent/hunyuan/hunyuan-a13b:hunyuan-moe-A13B-sglang \
    -m sglang.launch_server --model-path hunyuan/huanyuan_A13B --tp 4 --trust-remote-code --host 0.0.0.0 --port 30000

Contact Us

If you would like to leave a message for our R&D and product teams, Welcome to contact our open-source team . You can also contact us via email ( [email protected] ).