mixedbread-ai_-_mxbai-rerank-large-v2-4bits

RichardErkhov/mixedbread-ai_-_mxbai-rerank-large-v2-4bits

mixedbread-ai_-_mxbai-rerank-large-v2-4bits is a text ranking model from RichardErkhov. Use it for the text ranking task on the model card, and read the license before you ship it in a product.

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From the Hugging Face model README

Quantization made by Richard Erkhov.

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mxbai-rerank-large-v2 - bnb 4bits

Model creator: https://huggingface.co/mixedbread-ai/
Original model: https://huggingface.co/mixedbread-ai/mxbai-rerank-large-v2/

Original model description:

library_name: transformers license: apache-2.0 language:

🍞 mxbai-rerank-large-v2

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 blog post.

Paper following soon.

🎓 Citation

@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
Type: qwen2
Created: Mar 22, 2025
Updated: Apr 2, 2025