mxbai-rerank-base-v2-seq-cls

wissamantoun/mxbai-rerank-base-v2-seq-cls

mxbai-rerank-base-v2-seq-cls is a text ranking model from wissamantoun. Use it for the text ranking task on the model card, and read the license before you ship it in a product. It is set up for transformers. The card lists the license as apache-2.0.

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At a glance

Task: Text Ranking
Library: transformers
License: apache-2.0
Model type: qwen2
Access: Public
Created: Mar 15, 2026
Updated: Mar 15, 2026
SHA: c19d0af1

Base models

mixedbread-ai/mxbai-rerank-large-v2

Model card

From the Hugging Face model README

🍞 mxbai-rerank-large-v2-seq-cls

This model was converted from the original checkpoint to make it work with VLLM serve via the following code: convert_model_to_seq_cls.py

This is the large model in our family of powerful reranker models. You can learn more about the models in our blog post.

We have two models:

mxbai-rerank-base-v2
mxbai-rerank-large-v2 (🍞)

The technical report is coming soon!

🌟 Features

state-of-the-art performance and strong efficiency
multilingual support (100+ languages, outstanding English and Chinese performance)
code support
long-context support

⚙️ Usage

Install mxbai-rerank

pip install mxbai-rerank

Inference

from mxbai_rerank import MxbaiRerankV2

model = MxbaiRerankV2("mixedbread-ai/mxbai-rerank-large-v2")

query = "Who wrote 'To Kill a Mockingbird'?"
documents = [
    "'To Kill a Mockingbird' is a novel by Harper Lee published in 1960. It was immediately successful, winning the Pulitzer Prize, and has become a classic of modern American literature.",
    "The novel 'Moby-Dick' was written by Herman Melville and first published in 1851. It is considered a masterpiece of American literature and deals with complex themes of obsession, revenge, and the conflict between good and evil.",
    "Harper Lee, an American novelist widely known for her novel 'To Kill a Mockingbird', was born in 1926 in Monroeville, Alabama. She received the Pulitzer Prize for Fiction in 1961.",
    "Jane Austen was an English novelist known primarily for her six major novels, which interpret, critique and comment upon the British landed gentry at the end of the 18th century.",
    "The 'Harry Potter' series, which consists of seven fantasy novels written by British author J.K. Rowling, is among the most popular and critically acclaimed books of the modern era.",
    "'The Great Gatsby', a novel written by American author F. Scott Fitzgerald, was published in 1925. The story is set in the Jazz Age and follows the life of millionaire Jay Gatsby and his pursuit of Daisy Buchanan."
]

# Lets get the scores
results = model.rank(query, documents, return_documents=True, top_k=3)

print(results)

Performance

Benchmark Results

Model	BEIR Avg	Multilingual	Chinese	Code Search	Latency (s)
mxbai-rerank-large-v2	57.49	29.79	84.16	32.05	0.89
mxbai-rerank-base-v2	55.57	28.56	83.70	31.73	0.67
mxbai-rerank-large-v1	49.32	21.88	72.53	30.72	2.24

*Latency measured on A100 GPU

Training Details

The models were trained using a three-step process:

GRPO (Guided Reinforcement Prompt Optimization)
Contrastive Learning
Preference Learning

For more details, check our technical report and technical blog post.

🎓 Citation

If you find our models useful, please consider giving a star and citation

arXiv:

@article{li2025prorank,
  title={ProRank: Prompt Warmup via Reinforcement Learning for Small Language Models Reranking},
  author={Li, Xianming and Shakir, Aamir and Huang, Rui and Lipp, Julius and Li, Jing},
  journal={arXiv preprint arXiv:2506.03487},
  year={2025}
}

blog post:

@online{v2rerank2025mxbai,
  title={Baked-in Brilliance: Reranking Meets RL with mxbai-rerank-v2},
  author={Sean Lee and Rui Huang and Aamir Shakir and Julius Lipp},
  year={2025},
  url={https://www.mixedbread.com/blog/mxbai-rerank-v2},
}

Task: Text Ranking
Library: transformers
Type: qwen2
License: apache-2.0
Languages: af, am, ar, as, az, be
Created: Mar 15, 2026
Updated: Mar 15, 2026