Megrez2-3x7B-A3B-Preview

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Introduction

Megrez2-3x7B-A3B-Preview is a device native large language model. Megrez2 takes advantages of both the accuracy of Mixture-of-Experts (MoE) architecture and the compact size of Dense models. This preview model was trained on 5T Tokens of data. The official release, with larger training data and better reasoning and agent capabilities, will come later this year.

Model Card

Architecture	Mixture-of-Experts (MoE)
Total Parameters	3x7B
Activated Parameters	3B
Experts Shared Frequency	3
Number of Layers (Dense layer included)	31
Number of Dense Layers	1
Attention Hidden Dimension	2048
MoE Hidden Dimension (per Expert)	1408
Number of Attention Heads	16
Number of Experts	64
Selected Experts per Token	6
Number of Shared Experts	4
Vocabulary Size	128,880
Context Length	32K
Base Frequency of RoPE	5,000,000
Attention Mechanism	GQA
Activation Function	SwiGLU

Performance

We evaluated Megrez2-3x7B-A3B-Preview using the open-source evaluation tool OpenCompass on several important benchmarks. Some of the evaluation results are shown in the table below.

Benchmark	Metric	Megrez2-3x7B -A3B-Preview	Qwen2.5-3B	Qwen2.5-7B	Qwen3-4B	Qwen3-8B	Phi-4-mini	Gemma-3-4B	GPT-4o-mini 2024-07-18
Activate Params (B)		3.0	3.1	7.6	4.0	8.2	3.8	4.3	-
Stored Params (B)		7.5	3.1	7.6	4.0	8.2	3.8	4.3	-
General Tasks
C-EVAL	EM	91.7	68.2	76.2	72.2	77.9	40.0	-	66.3
MMLU-Pro	EM	67.6	43.7	56.3	-	-	52.8	43.6	-
Instruction Tasks
IF-Eval	Prompt Strict	80.2	58.2	71.2	81.2	83.0	68.6	90.2	80.4
Math & STEM Tasks
MATH-500	EM	81.6	65.9	75.5	84.8	87.4	64.0	75.6	78.2
GSM8K	EM	83.6	86.7	91.6	-	93.2	88.6	89.2	-
Coding Tasks
HumanEval	Pass@1	74.4	74.4	84.8	-	85.9	74.4	71.3	87.2
MBPP	Pass@1	88.0	72.7	79.2	-	77.0	65.3	63.2	-

How to Run

Transformers

The latest version of transformers is recommended or transformers>=4.52.4 is required. The following contains a code snippet illustrating how to use the model generate content based on given inputs.

from transformers import AutoModelForCausalLM, AutoTokenizer
import torch

path = "Infinigence/Megrez2-3x7B-A3B-Preview"
device = "cuda"

tokenizer = AutoTokenizer.from_pretrained(path, trust_remote_code=True)
model = AutoModelForCausalLM.from_pretrained(path, torch_dtype=torch.bfloat16, device_map=device, trust_remote_code=True)

messages = [
    {"role": "user", "content": "世界上最高的山峰是哪座？"},
]
model_inputs = tokenizer.apply_chat_template(messages, return_tensors="pt", add_generation_prompt=True).to(device)

model_outputs = model.generate(
    model_inputs,
    do_sample=True,
    max_new_tokens=1024
)

output_token_ids = [
    model_outputs[i][len(model_inputs[i]):] for i in range(len(model_inputs))
]

responses = tokenizer.batch_decode(output_token_ids, skip_special_tokens=True)[0]
print(responses)

# 世界上最高的山峰是珠穆朗玛峰（Mount Everest），位于喜马拉雅山脉的中尼边境。珠穆朗玛峰的海拔高度为8,848.86米（29,031.7英尺），这一数据是由中国和尼泊尔在2020年共同宣布的最新测量结果。珠穆朗玛峰不仅是登山爱好者的圣地，也是地理和科学研究的重要对象。

ModelScope

ModelScope adopts Python API similar to (though not entirely identical to) Transformers. For basic usage, simply modify the first line of the above code as follows:

from modelscope import AutoModelForCausalLM, AutoTokenizer

llama.cpp

Coming soon...

How to Deploy

Megrez2-3x7B-A3B-Preview support using vLLM and SGLang as inference backends. For more information, please visit the gitHub repository.

Best Practice

To achieve optimal performance, we recommend the following settings:

1. Sampling Parameters: we suggest using Temperature=0.7 and TopP=0.9 .

2. Standardize Output Format: We recommend using prompts to standardize model outputs when benchmarking.

   • Math Problems: Include "Please reason step by step, and put your final answer within \boxed{}." in the prompt.
   • Multiple-Choice Questions: Add the following JSON structure to the prompt to standardize responses: "Please show your choice in the answer field with only the choice letter, e.g., "answer": "C"."

License Agreement

All our open-weight models are licensed under Apache 2.0.

Citation

If you find our work helpful, feel free to give us a cite.

@misc{li2025megrez2technicalreport,
      title={Megrez2 Technical Report}, 
      author={Boxun Li and Yadong Li and Zhiyuan Li and Congyi Liu and Weilin Liu and Guowei Niu and Zheyue Tan and Haiyang Xu and Zhuyu Yao and Tao Yuan and Dong Zhou and Yueqing Zhuang and Bo Zhao and Guohao Dai and Yu Wang},
      year={2025},
      eprint={2507.17728},
      archivePrefix={arXiv},
      primaryClass={cs.CL},
      url={https://arxiv.org/abs/2507.17728}, 
}

Contact

If you have any questions, please feel free to submit a GitHub issue or contact WeChat groups.