Cohere Rerank 5 launch: calibration error vs human graders
We show this table for reference; we do not rank on it.
Cohere launch reranking report.
Evaluation results published by Cohere.
Expected calibration error on Cohere Rerank 5 launch: calibration error vs human graders — October 21, 2026 launch; November 4 capture
We mirror the published expected calibration error view for Cohere Rerank 5 launch: calibration error vs human graders. Cohere Rerank 5 Pro leads the public snapshot at 0.058, followed by Cohere Rerank 5 Fast (0.058) and Voyage AI Rerank 3 Lite (0.226). We do not use these results to rank models overall.
Cohere Rerank 5 Pro
Cohere
Cohere provider report; evaluated snapshot and hardware undisclosed
Cohere Rerank 5 Fast
Cohere
Cohere provider report; evaluated snapshot and hardware undisclosed
Voyage AI Rerank 3 Lite
Voyage AI
Cohere provider report; evaluated snapshot and hardware undisclosed
5 configurationsCross-domainDated provider configurationsDisplay onlyUpdated October 21, 2026 launch; November 4 capture
Expected calibration error table (5 configurations)
| Rank | Model / configuration | Score | Parameters (B) | Open / closed |
|---|---|---|---|---|
| 1 | Cohere Rerank 5 ProCohereCohere provider report; evaluated snapshot and hardware undisclosed | 0.058 | Not reported | Unknown |
| 2 | Cohere Rerank 5 FastCohereCohere provider report; evaluated snapshot and hardware undisclosed | 0.058 | Not reported | Unknown |
| 3 | Voyage AI Rerank 3 LiteVoyage AICohere provider report; evaluated snapshot and hardware undisclosed | 0.226 | Not reported | Unknown |
| 4 | Voyage AI Rerank 3Voyage AICohere provider report; evaluated snapshot and hardware undisclosed | 0.234 | Not reported | Unknown |
| 5 | Cohere Rerank 4 ProCohereCohere provider report; evaluated snapshot and hardware undisclosed | 0.384 | Not reported | Unknown |
How to read this provider report
Expected calibration error of raw relevance scores against blind human graders: 2,262 documents, useful = mean grade of "Useful" or higher on a five-point scale. Lower is better; 0 is perfect. Scores used as returned, with no recalibration.
Cohere reports these results in its Rerank 5 launch. The linked full spreadsheet requires sign-in at capture, so this view includes only exact figures available in the public post. Model snapshots, evaluation dates, candidate-set sizes, and uncertainty intervals are undisclosed.
Each metric retains its own cohort. Rerankers reorder candidates from a first-stage search; these scores do not measure embedding or keyword retrieval on their own. These provider comparisons do not enter weighted model rankings.
The published Cohere Rerank 5 launch: calibration error vs human graders snapshot places Cohere Rerank 5 Pro first at 0.058. The third row is 0.168 score units higher. The broader top-10 range is 0.326 score units, so many of the published results sit in a relatively narrow band.
5 configurations are shown for Cohere Rerank 5 launch: calibration error vs human graders. The benchmark falls in the Cross-domain category. We keep external benchmark mirrors separate from the weighted global scoring system, so these results remain source-specific evidence. Cohere Rerank 5 launch: calibration error vs human graders is currently displayed for reference but excluded from the scoring formula, so it does not directly affect overall rankings.
Freshness and provenance
Version
Cohere Rerank 5 launch provider report
Refresh cadence
Reviewed dated source capture
Staleness state
Dated provider configurations
Question availability
Upstream datasets and terms; aggregate results only
BenchLM uses freshness metadata to decide whether a benchmark should still be treated as a strong differentiator, a benchmark to watch, or a display-only reference. For the full scoring policy, see the BenchLM methodology page.
Questions
What does Cohere Rerank 5 launch: calibration error vs human graders measure?
Cohere launch reranking report.
Which model leads the published Cohere Rerank 5 launch: calibration error vs human graders snapshot?
Cohere Rerank 5 Pro currently leads the published Cohere Rerank 5 launch: calibration error vs human graders snapshot with 0.058 expected calibration error. BenchLM shows this benchmark for display only and does not use it in overall rankings.
How many models are evaluated on Cohere Rerank 5 launch: calibration error vs human graders?
The October 21, 2026 launch; November 4 capture snapshot contains 5 AI models.
Know when it’s worth switching models
The model to choose, the cheaper alternative, and the release we would wait on.
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