Model comparison
Compare Cohere Rerank 4 Pro and Cohere Rerank 4 Fast using the same provider-sourced reranking & retrieval rubric. No mystery score and no invented benchmark ranking.
Facts checked September 4, 2026
Quick take
Cohere's quality-first reranker for improving search and RAG results across multilingual text and semi-structured JSON.
One billing unit includes up to 100 documents, not the endpoint's full 10,000-document request limit. Long documents can become several billable chunks.
Cohere's lower-latency Rerank 4 option for high-volume search, recommendations, and RAG retrieval.
Fast is a relative product tier, not a latency guarantee. Measure it with your document lengths, region, candidate count, and traffic pattern.
Compare the published facts
Values use each provider's own published units and limits. A blank means the provider did not publish a directly comparable value in the sources reviewed.
| Reranking & retrieval | Cohere Rerank 4 Pro | Cohere Rerank 4 Fast |
|---|---|---|
| Price basisThe provider's billing unit, with the document or token assumptions needed to compare it fairly. | $2.50 / 1K searches; up to 100 docs per unit | $2 / 1K searches; up to 100 docs per unit |
| Text capacityHow much query and candidate text the model can consider in one scoring pass. | 32,768 tokens per query-document pass | 32,768 tokens per query-document pass |
| Candidates per requestThe maximum number of possible results accepted in one request, when the provider publishes it. | Up to 10,000 documents per request | Up to 10,000 documents per request |
| Language coveragePublished multilingual support; an exact count is shown only when the provider gives one. | Multilingual; exact count not published | Multilingual; exact count not published |
| Structured dataWhether the model is documented for JSON, tables, XML, or other data beyond normal prose. | Text and semi-structured JSON | Text and semi-structured JSON |
| Where it runsHosted API, cloud marketplace, private deployment, or self-hosted weights. | Cohere API; enterprise private and cloud options | Cohere API; enterprise private and cloud options |
How to choose
Start with the job you need to complete, then validate cost, access, and policy details on your exact provider route.
Cohere enterprise customers can opt out of training; SaaS prompts and generations are generally deleted after 30 days. Approved zero-data-retention accounts and private or third-party deployments offer stronger controls.
Provider and API links
Cohere enterprise customers can opt out of training; SaaS prompts and generations are generally deleted after 30 days. Approved zero-data-retention accounts and private or third-party deployments offer stronger controls.
Provider and API links
Frequently asked questions
Cohere Rerank 4 Pro: Cohere's quality-first reranker for improving search and RAG results across multilingual text and semi-structured JSON. Cohere Rerank 4 Fast: Cohere's lower-latency Rerank 4 option for high-volume search, recommendations, and RAG retrieval.
Consider Cohere Rerank 4 Pro when your priority is High-value enterprise search. Consider Cohere Rerank 4 Fast when your priority is High-throughput product search. Test both with your own data and provider route before committing.
No. This comparison aligns provider-published facts for the Reranking & retrieval category. It does not claim a universal winner or combine incompatible third-party benchmark scores.
