# Claude Fable 5.1Medium

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Anthropic

Canonical URL: https://benchize.com/models/claude-fable-5-1-medium
Last updated: Thu, 22 Oct 2026 05:40:11 GMT

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Anthropic

## Benchmarks

| Benchmark | Score | Rank | Cost | Source |  |
| --- | --- | --- | --- | --- | --- |
| [FrontierCode 1.1 main](https://benchize.com/benchmarks/frontiercode%3Av1_1%3Amain.md) | 50.91% | 12 / 125 | $3.28 | [frontiercode](https://cognition.com/data/frontiercode-leaderboard/data.json) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 0.5091 \| score_fraction \| blocking_criteria_adjusted \| Higher is better \| \| `correct` \| 0.5545 \| score_fraction \| raw_rubric \| Higher is better \| \| `cost` \| 3.2845 \| USD \| per_rollout \| Lower is better \| ### Configuration harness claude-code Reasoning effort medium sourceVersion v1_1 subset main ### Reported statistics flaggedRate 0 sampleSize 100 ### Source [Original source](https://cognition.com/data/frontiercode-leaderboard/data.json) Source frontiercode Original model label Claude Fable 5.1 Observed 2026-10-22T05:40:03.220Z Evidence SHA-256 `ff0040778b7bdf69c705ad7474f771fb5e53cfaf5cf8573b3a4614153543d75f` Source locator `/v1_1/data/Claude%20Fable%205.1/medium/main` |  |  |  |  |  |
| [ARC-AGI-2](https://benchize.com/benchmarks/arc-prize%3Av2_Semi_Private.md) | 86.25% | 27 / 243 | 1.22usd per task | [arc prize · v2](https://arcprize.org/media/data/leaderboard/v2.json) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 0.8625 \| score_fraction \| v2_Semi_Private \| Higher is better \| \| `cost_per_task` \| 1.2239411666666673 \| usd_per_task \| v2_Semi_Private \| Lower is better \| ### Configuration evaluationSplit v2_Semi_Private harness Not reported modelGroup anthropic-claude-fable-5-1 modelType CoT Reasoning effort medium sourceModelVersion anthropic-claude-fable-5-1-medium thinkingEnabled true ### Source [Original source](https://arcprize.org/media/data/leaderboard/v2.json) Source arc prize Original model label Claude Fable 5.1 (Medium) Source version v2 Observed 2026-10-22T05:20:04.306Z Evidence SHA-256 `4351eb696e78113b0459e9bb5f0258318b905efef34f473dcea51ce641b0d94d` Source locator `/evaluations/223` |  |  |  |  |  |
| [FrontierCode 1.1 extended](https://benchize.com/benchmarks/frontiercode%3Av1_1%3Aextended.md) | 63.6% | 9 / 125 | $2.68 | [frontiercode](https://cognition.com/data/frontiercode-leaderboard/data.json) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 0.636 \| score_fraction \| blocking_criteria_adjusted \| Higher is better \| \| `correct` \| 0.688 \| score_fraction \| raw_rubric \| Higher is better \| \| `cost` \| 2.6825 \| USD \| per_rollout \| Lower is better \| ### Configuration harness claude-code Reasoning effort medium sourceVersion v1_1 subset extended ### Reported statistics flaggedRate 0 sampleSize 150 ### Source [Original source](https://cognition.com/data/frontiercode-leaderboard/data.json) Source frontiercode Original model label Claude Fable 5.1 Observed 2026-10-22T05:40:03.220Z Evidence SHA-256 `ff0040778b7bdf69c705ad7474f771fb5e53cfaf5cf8573b3a4614153543d75f` Source locator `/v1_1/data/Claude%20Fable%205.1/medium/extended` |  |  |  |  |  |
| [ARC-AGI-1](https://benchize.com/benchmarks/arc-prize%3Av1_Semi_Private.md) | 94.5% | 38 / 245 | 0.44usd per task | [arc prize · v1](https://arcprize.org/media/data/leaderboard/v1.json) |  |
| ### Original source values \| Metric \| Value \| Unit \| Scope \| Direction \| \| --- \| --- \| --- \| --- \| --- \| \| `score` \| 0.945 \| score_fraction \| v1_Semi_Private \| Higher is better \| \| `cost_per_task` \| 0.4425576000000001 \| usd_per_task \| v1_Semi_Private \| Lower is better \| ### Configuration evaluationSplit v1_Semi_Private harness Not reported modelGroup anthropic-claude-fable-5-1 modelType CoT Reasoning effort medium sourceModelVersion anthropic-claude-fable-5-1-medium thinkingEnabled true ### Source [Original source](https://arcprize.org/media/data/leaderboard/v1.json) Source arc prize Original model label Claude Fable 5.1 (Medium) Source version v1 Observed 2026-10-22T05:20:04.066Z Evidence SHA-256 `2bf68d22dafba37047d07ad833ebc0e8199c9aa2f9eeaed50c75c1b704462836` Source locator `/evaluations/222` |  |  |  |  |  |

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Cite as: Claude Fable 5.1Medium — Benchize, https://benchize.com/models/claude-fable-5-1-medium (retrieved 2026-10-22)