Anthropic
claude-fable-5-1
Made by Anthropic. Released 2026-09-01. Accessibility not recorded. We hold no price for this model: no seller we can read lists it any more, so what follows is what was measured, not what it cost.
What it scores, by house
| Benchmark | House | Score | Evaluated | Scaffold |
|---|---|---|---|---|
| chess puzzles | Epoch AI | 0.5±0.05 | 2026-09-01 | max |
| ebr bench | Epoch AI | 0.6±0.06 | 2026-09-08 | max |
| frontiermath erdos | Epoch AI | 0.0±0.00 | 2026-09-01 | max |
| frontiermath tier 4 v2 | Epoch AI | 0.9±0.05 | 2026-09-01 | max |
| frontiermath tiers 1 3 v2 | Epoch AI | 0.9±0.02 | 2026-09-01 | max |
| mirrorcode | Epoch AI | 0.7 | 2026-09-10 | high |
| mystery game puzzles | Epoch AI | 0.6±0.05 | 2026-09-01 | max |
| otis mock aime 2024 2025near its ceiling | Epoch AI | 1.0±0.00 | 2026-09-01 | max |
| simpleqa verified | Epoch AI | 0.7±0.01 | 2026-09-01 | max |
| ale bench | collected by Epoch AI | 2143 | — | high |
| apex agents | collected by Epoch AI | 0.6 | — | unknown |
| apex agents | collected by Epoch AI | 0.6 | — | high |
| arc aginear its ceiling | collected by Epoch AI | 1.0 | — | high |
| arc aginear its ceiling | collected by Epoch AI | 1.0 | — | xhigh |
| arc aginear its ceiling | collected by Epoch AI | 1.0 | — | max |
| arc aginear its ceiling | collected by Epoch AI | 0.9 | — | medium |
| arc aginear its ceiling | collected by Epoch AI | 0.9 | — | low |
| arc agi 2 | collected by Epoch AI | 0.9 | — | max |
| arc agi 2 | collected by Epoch AI | 0.8 | — | low |
| arc agi 2 | collected by Epoch AI | 0.9 | — | medium |
| arc agi 2 | collected by Epoch AI | 0.9 | — | xhigh |
| arc agi 2 | collected by Epoch AI | 0.9 | — | high |
| blueprint bench 2 | collected by Epoch AI | 0.4 | — | unknown |
| critpt | collected by Epoch AI | 0.3 | — | medium |
| critpt | collected by Epoch AI | 0.3 | — | low |
| critpt | collected by Epoch AI | 0.3 | — | xhigh |
| critpt | collected by Epoch AI | 0.3 | — | high |
| critpt | collected by Epoch AI | 0.3 | — | max |
| cursorbench | collected by Epoch AI | 0.7 | — | max |
| cursorbench | collected by Epoch AI | 0.7 | — | low |
| cursorbench | collected by Epoch AI | 0.7 | — | medium |
| cursorbench | collected by Epoch AI | 0.7 | — | high |
| cursorbench | collected by Epoch AI | 0.7 | — | xhigh |
| frontiercode | collected by Epoch AI | 0.5 | — | claude-code |
| frontierswe | collected by Epoch AI | 0.6 | — | proximus |
| hle | collected by Epoch AI | 0.5 | — | xhigh |
| proofbench | collected by Epoch AI | 1.0 | — | max |
| scicode | collected by Epoch AI | 0.6 | — | xhigh |
| scicode | collected by Epoch AI | 0.6 | — | high |
| scicode | collected by Epoch AI | 0.6 | — | low |
| scicode | collected by Epoch AI | 0.6 | — | medium |
| scicode | collected by Epoch AI | 0.6 | — | max |
| vending bench 2 | collected by Epoch AI | 5422 | — | unknown |
| webdev arena | collected by Epoch AI | 1765 | — | max |
| weirdml | collected by Epoch AI | 0.9 | — | max |
| weirdml | collected by Epoch AI | 0.9 | — | high |
These scores are not comparable between houses and are not added up. A score is dated by when it was evaluated, not when the model was released, and a score without its scaffold is not a measurement — which is why both are printed.
What retires, and when
- deprecation — 2027-09-01 (Active)