mxbai-rerank v2 overview and key facts (October 2026)

mxbai-rerank v2 is a pair of open reranker models, large and base, that sort search results by relevance to a query. Developers can self-host them or use them through Mixedbread's hosted search API.

Mixedbread AI Inc. publishes the models on Hugging Face under the Apache 2.0 license. The model card lists support for more than 100 languages with strong English and Chinese performance, code understanding and long-context support; training combined reinforcement learning with contrastive and preference learning. As of September 28, 2026 the large model had about 89,000 downloads in the last month and the base model about 29,000. Mixedbread also runs a hosted search product with rerank as a paid add-on. Its privacy policy states SOC 2 Type II certification for the Security criterion, and a data processing agreement is published on its website.

• Reranks results for RAGThe model scores each candidate passage against the query and reorders the list before it reaches the language model. Answers then rely on the most relevant text.
• Ranks code and technical contentCode understanding is listed among the model's capabilities. Developer portals and internal engineering wikis can use one reranker for prose and code.
• Adds reranking to hosted searchIn Mixedbread's search API, rerank is an optional add-on to semantic search. Teams without their own GPU servers get reranking without running the model.

• Two sizes allow a trade-off between accuracy and speed on your own hardware.
• Apache 2.0 weights plus an optional hosted API with published per-query prices.
• Enterprise customers can keep data in their own bucket or cloud (BYOB, BYOC).

The publisher is Mixedbread AI Inc., which according to its privacy policy stores data mainly in the United States.

Self-hosting needs GPU capacity for the large model. For the hosted API, the privacy policy states that data is stored mainly in the US and that free-tier data is retained indefinitely, so use a paid plan for business data and review the DPA. SSO is part of the enterprise plan.

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