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

BenchmarkHouseScoreEvaluatedScaffold
chess puzzlesEpoch AI0.5±0.052026-09-01max
ebr benchEpoch AI0.6±0.062026-09-08max
frontiermath erdosEpoch AI0.0±0.002026-09-01max
frontiermath tier 4 v2Epoch AI0.9±0.052026-09-01max
frontiermath tiers 1 3 v2Epoch AI0.9±0.022026-09-01max
mirrorcodeEpoch AI0.72026-09-10high
mystery game puzzlesEpoch AI0.6±0.052026-09-01max
otis mock aime 2024 2025near its ceilingEpoch AI1.0±0.002026-09-01max
simpleqa verifiedEpoch AI0.7±0.012026-09-01max
ale benchcollected by Epoch AI2143high
apex agentscollected by Epoch AI0.6unknown
apex agentscollected by Epoch AI0.6high
arc aginear its ceilingcollected by Epoch AI1.0high
arc aginear its ceilingcollected by Epoch AI1.0xhigh
arc aginear its ceilingcollected by Epoch AI1.0max
arc aginear its ceilingcollected by Epoch AI0.9medium
arc aginear its ceilingcollected by Epoch AI0.9low
arc agi 2collected by Epoch AI0.9max
arc agi 2collected by Epoch AI0.8low
arc agi 2collected by Epoch AI0.9medium
arc agi 2collected by Epoch AI0.9xhigh
arc agi 2collected by Epoch AI0.9high
blueprint bench 2collected by Epoch AI0.4unknown
critptcollected by Epoch AI0.3medium
critptcollected by Epoch AI0.3low
critptcollected by Epoch AI0.3xhigh
critptcollected by Epoch AI0.3high
critptcollected by Epoch AI0.3max
cursorbenchcollected by Epoch AI0.7max
cursorbenchcollected by Epoch AI0.7low
cursorbenchcollected by Epoch AI0.7medium
cursorbenchcollected by Epoch AI0.7high
cursorbenchcollected by Epoch AI0.7xhigh
frontiercodecollected by Epoch AI0.5claude-code
frontierswecollected by Epoch AI0.6proximus
hlecollected by Epoch AI0.5xhigh
proofbenchcollected by Epoch AI1.0max
scicodecollected by Epoch AI0.6xhigh
scicodecollected by Epoch AI0.6high
scicodecollected by Epoch AI0.6low
scicodecollected by Epoch AI0.6medium
scicodecollected by Epoch AI0.6max
vending bench 2collected by Epoch AI5422unknown
webdev arenacollected by Epoch AI1765max
weirdmlcollected by Epoch AI0.9max
weirdmlcollected by Epoch AI0.9high

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

  • deprecation2027-09-01 (Active)

Every rate we hold · Why there is no single best model ·