Baichuan-M2-32B-GPTQ-Int4

🌟 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

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

For deployment, you can use sglang>=0.4.6.post1 or vllm>=0.9.0 or to create an OpenAI-compatible API endpoint:

• SGLang:

  python -m sglang.launch_server --model-path baichuan-inc/Baichuan-M2-32B-GPTQ-Int4 --reasoning-parser qwen3
  

  To turn on kv cache FP8 quantization:

  python -m sglang.launch_server --model-path baichuan-inc/Baichuan-M2-32B-GPTQ-Int4 --reasoning-parser qwen3 --kv-cache-dtype fp8_e4m3 --attention-backend flashinfer
  

• vLLM:

  vllm serve baichuan-inc/Baichuan-M2-32B-GPTQ-Int4  --reasoning-parser qwen3
  

  To turn on kv cache FP8 quantization:

  vllm serve baichuan-inc/Baichuan-M2-32B-GPTQ-Int4  --reasoning-parser qwen3 --kv_cache_dtype fp8_e4m3
  

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-GPTQ-Int4 \
--speculative-algorithm EAGLE3 \
--speculative-draft-model-path Baichuan-M2-32B-GPTQ-Int4/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. 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
• Technical Support: GitHub

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