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Specialist modelActive

Cohere Rerank 5 Fast

Cohere

Released
October 21, 2026
Data date
October 24, 2026
Access
Cohere Rerank API, with additional documented enterprise and cloud deployment options
Input price
$0.02
Per 1M input tokens

Rerank 5 Fast is the smaller, throughput-oriented text reranker. Its API orders documents and returns calibrated relevance scores; Cohere lists about 500 million parameters and a limit of 32,768 tokens for the query plus each individual document.

Specifications and access

SpecificationValue and source
Model type
ProprietarySource
API model ID
rerank-v5.0-fastSource
Release
Released on October 21, 2026Source
Access
Cohere Rerank API, with additional documented enterprise and cloud deployment optionsSource
Deployment options
Cohere API (subject to rate limits), Model Vault, and North; Microsoft Foundry and Amazon SageMaker list Pro and Fast. Private VPC or on-premises deployment is available on request.Source
Input
Text, including semi-structured data such as JSON, tables, and records passed as textSource
Output
Documents ordered by relevance with a calibrated score from 0 to 1Source
Context length
32,768 tokens per query and individual documentSource
Parameter count
Approximately 500 million parametersSource
Languages
Multilingual model; Cohere lists more than 100 languagesSource
Context Focus
Can return relevant spans from documents to pass fewer irrelevant tokens to downstream answersSource
Deployment options
Cohere API (rate limits apply), Model Vault, Microsoft Foundry and Amazon SageMaker (both list Pro and Fast), North, private VPC or on-premises deployment on requestSource
Release
2026-10-21Source
Approximate parameter count in billions
0.5Source
Architecture
proprietarySource
Input modality
textSource
Source output
ordered documents with calibrated relevance scores from 0 to 1Source
Languages
100+Source
Context Focus
optionalSource
Price per million tokens in USD
0.02 tokens (No separate token-side pricing distinction is published in the article.)Source
API model ID evaluated by Exa
Exa's evaluation appendix identifies rerank-v5.0-fast as the Cohere endpoint queried for all seven benchmarks.Source
Exa evaluation query date
Protocol says Cohere Rerank 5 Fast was queried on October 21, 2026, for all seven benchmarks.Source
Exa evaluation sample sizes
BEIR: 1,646; MIRACL: 12,514; MAIR: 9,972; coding: 317; navigation: 639; freshness: 1,000; authority: 1,000 queries.Source
Exa evaluation protocol
Same queries and candidate lists in identical order; BEIR/MIRACL/MAIR use Gemini Embedding 2 top-50 results, coding/navigation use Exa Search Instant top 50, freshness/authority use 60 candidates. (BEIR/MIRACL/MAIR title and document text: 20,000 characters; coding extracts: 720; navigational extracts: 8,000; freshness/authority: 720 plus URL, title and publication date. MAIR uses “Instruct: {instruction} Query: {query}”.)Source
Exa statistical method
nDCG@10; stratified query bootstrap B=10,000, resampling within subsets; macro averages recomputed per draw; paired model differences use the same draws and count as significant only if the paired 95% interval excludes zero.Source
Exa evaluation ownership
The article describes its own models as serving Exa production search and names Cohere among competitors.Source