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Cohere Rerank 4 Pro

Cohere Rerank 4 Pro is a multilingual reranking model from Cohere built for state-of-the-art relevance on complex queries over English and non-English documents and semi-structured JSON.

Rerank
index.ts
import { rerank } from 'ai';


const result = await rerank({
  model: 'cohere/rerank-v4-pro',
  query: 'What is the capital of France?',
  documents: [
    'Paris is the capital of France.',
    'Berlin is the capital of Germany.',
    'Madrid is the capital of Spain.',
  ],
})
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Frequently Asked Questions

  • How does Cohere Rerank 4 Pro differ from rerank-v4-fast?

    Cohere Rerank 4 Pro prioritizes ranking quality on complex queries, while rerank-v4-fast is tuned for lower latency and higher throughput. Both share the same multilingual coverage of 100+ languages and the same per-document context of 32K tokens.

  • When does Cohere Rerank 4 Pro outperform an embedding model alone?

    On multi-part queries, queries with conditions, and queries where relevance hinges on a single phrase inside a long document. Cross-attention between the query and the full document text picks up signal that bi-encoder embedding similarity flattens.

  • Which document types does Cohere Rerank 4 Pro support?

    Long-form text, semi-structured JSON, tables, code, and email-style records. The per-document context window is 32K tokens, shared between query and document tokens.

  • Does Cohere Rerank 4 Pro handle multilingual search?

    Yes. It covers more than 100 languages and supports cross-lingual matching, so a query in one language can rank documents written in another within the same call.

  • How is Cohere Rerank 4 Pro billed on AI Gateway?

    Reranking is priced per search query rather than per token. Cost scales with the number of rerank calls rather than document length. See the pricing section on this page for the current rate.

  • How does Cohere Rerank 4 Pro compare to rerank-v3.5?

    rerank-v3.5 is the December 2024 English-focused reranker. Cohere Rerank 4 Pro is the December 2025 multilingual quality tier with broader language coverage and stronger reasoning on complex queries.

  • Does Cohere Rerank 4 Pro support Zero Data Retention?

    Zero Data Retention is not currently available for this model. Zero Data Retention is offered on a per-provider basis. See https://vercel.com/docs/ai-gateway/capabilities/zdr for details.