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ZeroEntropy zerank-1 Reranker

zerank-1 is the flagship reranker by ZeroEntropy, trained with a novel Elo-style pipeline that consistently outperforms every other reranker. By boosting both semantic and lexical search, it delivers more accurate answers across legal, medical, technical, financial, and code domains.

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About

ZeroEntropy delivers the fastest and most accurate agentic retrieval engine on the market. Our ZeroEntropy Rerankers (zerank-1 & zerank-1-small)

Boost the precision of any semantic or lexical search system with ZeroEntropy's state-of-the-art rerankers. Our models rescore and reorder results to surface the most relevant answers--reducing noise, improving accuracy, and cutting hallucinations in RAG and AI agents across verticals.

Trained with a novel Elo-based pipeline, zerank-1 is an open-weight model, and consistently outperforms Cohere, Salesforce, and even LLM rerankers from Google and OpenAI--delivering higher accuracy at lower latency and cost.

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