Claude Fable 5.1
anthropic/claude-fable-5.1
Creator
AnthropicReleased
2026-09-01Weights
closedContext
1M tokens ~Price in / out per Mtok
$10.00 / $50.00vendor list price, fetched 2026-10-19
State
rankedHealth summary
6 of 11 scores sit on benchmarks that still discriminate. Every number here has been measured independently. 5 sit on benchmarks with a high risk of test-set contamination.
Epoch Capability Index
164.7 (161.9–168.5)
Epoch AI's Capability Index. A composite score with no benchmark health record behind it, so it is never this site's ranking basis and is always attributed. Published by Epoch AI under CC BY 4.0. fetched 2026-10-19
Scores
| Benchmark | Config | Score | Harness | Provenance | Measured | Health |
|---|---|---|---|---|---|---|
| Reasoning | ||||||
| ARC-AGI-2nearing saturation | max | 90.0% | not reported | ind. | 2026-09-01 | superseded |
| Knowledge | ||||||
| Humanity's Last Examactive | xhigh | 46.5% | not reported | ind. | 2026-09-01 | clear |
| On benchmarks that no longer discriminateKept visible on purpose. These are often the numbers a launch announcement leads with. | ||||||
| ARC-AGIsaturated | max | 97.5% | not reported | ind. | 2026-09-01 | saturatedcontaminatedsuperseded |