README.md

---
license: apache-2.0
tags:
- chat
library_name: transformers
language:
- en
- zh
base_model:
- Qwen/Qwen2.5-32B
---

# Baichuan-M2-32B
[![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
[![Hugging Face](https://img.shields.io/badge/🤗%20Hugging%20Face-Model-yellow)](https://huggingface.co/baichuan-inc/Baichuan-M2-32B)
[![M2 GPTQ-4bit](https://img.shields.io/badge/🤗%20M2%20GPTQ--4bit-Model-orange)](https://huggingface.co/baichuan-inc/Baichuan-M2-32B-GPTQ-Int4)
[![Huawei Ascend 8bit](https://img.shields.io/badge/✨%20Huawei%20Ascend%208bit-Model-green)](https://modelers.cn/models/Baichuan/Baichuan-M2-32B-W8A8)

## 🌟 Model Overview

Baichuan-M2-32B is Baichuan AI's medical-enhanced reasoning model, the second medical model released by Baichuan. Designed for real-world medical reasoning tasks, this model builds upon Qwen2.5-32B with an innovative Large Verifier System. Through domain-specific fine-tuning on real-world medical questions, it achieves breakthrough medical performance while maintaining strong general capabilities.

**Model Features:**

Baichuan-M2 incorporates three core technical innovations: First, through the **Large Verifier System**, it combines medical scenario characteristics to design a comprehensive medical verification framework, including patient simulators and multi-dimensional verification mechanisms; second, through **medical domain adaptation enhancement** via Mid-Training, it achieves lightweight and efficient medical domain adaptation while preserving general capabilities; finally, it employs a **multi-stage reinforcement learning** strategy, decomposing complex RL tasks into hierarchical training stages to progressively enhance the model's medical knowledge, reasoning, and patient interaction capabilities.

**Core Highlights:**
- 🏆 **World's Leading Open-Source Medical Model**: Outperforms all open-source models and many proprietary models on HealthBench, achieving medical capabilities closest to GPT-5
- 🧠 **Doctor-Thinking Alignment**: Trained on real clinical cases and patient simulators, with clinical diagnostic thinking and robust patient interaction capabilities
- ⚡ **Efficient Deployment**: Supports 4-bit quantization for single-RTX4090 deployment, with 58.5% higher token throughput in MTP version for single-user scenarios

## 📊 Performance Metrics

### HealthBench Scores

| Model Name | HealthBench | HealthBench-Hard | HealthBench-Consensus |
|------------|-------------|------------------|-----------------------|
| Baichuan-M2 | 60.1 | 34.7 | 91.5 |
| gpt-oss-120b | 57.6 | 30 | 90 |
| Qwen3-235B-A22B-Thinking-2507 | 55.2 | 25.9 | 90.6 |
| Deepseek-R1-0528 | 53.6 | 22.6 | 91.5 |
| GLM-4.5 | 47.8 | 18.7 | 85.3 |
| Kimi-K2 | 43 | 10.7 | 90.9 |
| gpt-oss-20b | 42.5 | 10.8 | 82.6 |

### General Performance

| Benchmark | Baichuan-M2-32B | Qwen3-32B (Thinking) |
|-----------|-----------------|-----------|
| AIME24 | 83.4 | 81.4 |
| AIME25 | 72.9 | 72.9 |
| Arena-Hard-v2.0 | 45.8 | 44.5 |
| CFBench | 77.6 | 75.7 |
| WritingBench | 8.56 | 7.90 |

*Note: AIME uses max_tokens=64k, others use 32k; temperature=0.6 for all tests.*

## 🔧 Technical Features

📗 **Technical Blog**: [Blog - Baichuan-M2](https://www.baichuan-ai.com/blog/baichuan-M2)

### Large Verifier System
- **Patient Simulator**: Virtual patient system based on real clinical cases
- **Multi-Dimensional Verification**: 8 dimensions including medical accuracy, response completeness, and follow-up awareness
- **Dynamic Scoring**: Real-time generation of adaptive evaluation criteria for complex clinical scenarios
### Medical Domain Adaptation
- **Mid-Training**: Medical knowledge injection while preserving general capabilities
- **Reinforcement Learning**: Multi-stage RL strategy optimization
- **General-Specialized Balance**: Carefully balanced medical, general, and mathematical composite training data

## ⚙️ Quick Start

```python
# 1. load model
from transformers import AutoTokenizer, AutoModelForCausalLM
model = AutoModelForCausalLM.from_pretrained("baichuan-inc/Baichuan-M2-32B", trust_remote_code=True)
tokenizer = AutoTokenizer.from_pretrained("baichuan-inc/Baichuan-M2-32B")
# 2. Input prompt text
prompt = "Got a big swelling after a bug bite. Need help reducing it."
# 3. Encode the input text for the model
messages = [
    {"role": "user", "content": prompt}
]
text = tokenizer.apply_chat_template(
    messages,
    tokenize=False,
    add_generation_prompt=True,
    thinking_mode='on' # on/off/auto 
)
model_inputs = tokenizer([text], return_tensors="pt").to(model.device)
# 4. Generate text
generated_ids = model.generate(
    **model_inputs,
    max_new_tokens=4096
)
output_ids = [
    output_ids[len(input_ids):] for input_ids, output_ids in zip(model_inputs.input_ids, generated_ids)
][0].tolist()
# 5. parsing thinking content
try:
    # rindex finding 151668 (</think>)
    index = len(output_ids) - output_ids[::-1].index(151668)
except ValueError:
    index = 0

thinking_content = tokenizer.decode(output_ids[:index], skip_special_tokens=True).strip("\n")
content = tokenizer.decode(output_ids[index:], skip_special_tokens=True).strip("\n")

print("thinking content:", thinking_content)
print("content:", content)

```

For deployment, you can use `sglang>=0.4.6.post1` or `vllm>=0.9.0` or to create an OpenAI-compatible API endpoint:
- SGLang:
    ```shell
    python -m sglang.launch_server --model-path baichuan-inc/Baichuan-M2-32B --reasoning-parser qwen3
    ```
- vLLM:
    ```shell
    vllm serve baichuan-inc/Baichuan-M2-32B  --reasoning-parser qwen3
    ```

## MTP inference with SGLang

1. Replace the qwen2.py file in the sglang installation directory with draft/qwen2.py.
2. Launch sglang:
```
python3 -m sglang.launch_server \
--model Baichuan-M2-32B \
--speculative-algorithm EAGLE3 \
--speculative-draft-model-path Baichuan-M2-32B/draft \
--speculative-num-steps 6 \
--speculative-eagle-topk 10 \
--speculative-num-draft-tokens 32 \
--mem-fraction 0.9 \
--cuda-graph-max-bs 2 \
--reasoning-parser qwen3 \
--dtype bfloat16
```

## ⚠️ Usage Notices
1. **Medical Disclaimer**: For research and reference only; cannot replace professional medical diagnosis or treatment
2. **Intended Use Cases**: Medical education, health consultation, clinical decision support
3. **Safe Use**: Recommended under guidance of medical professionals

## 📄 License
Licensed under the [Apache License 2.0](LICENSE). Research and commercial use permitted.

## 🤝 Acknowledgements
- Base Model: Qwen2.5-32B
- Training Framework: verl
- Inference Engines: vLLM, SGLang
- Quantization: AutoRound, GPTQ
Thank you to the open-source community. We commit to continuous contribution and advancement of healthcare AI.

## 📞 Contact Us
- Resources: [Baichuan AI Website](https://www.baichuan-ai.com)
- Technical Support: [GitHub](https://github.com/baichuan-inc)

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