AIpedia#196 Claude Fable 5.1
Released: · SourceText; Coding; Reasoning
- Use cases
- Coding, Reasoning, Text
- Accepts
- No verified data
- Produces
- No verified data
Access
Price USD
| Provider | Price USD | Conditions |
|---|---|---|
| Anthropic · API | $0.25 / 1M cache-read tokens | Standard · Direct Claude API; base input, 5m/1h cache writes, cache hits and output have separate rates. Not a Claude/Claude Code subscription price.Source · 19.09.2026 |
| Anthropic · API | $12.5 / 1M cache-write tokens | Standard · Direct Claude API; base input, 5m/1h cache writes, cache hits and output have separate rates. Not a Claude/Claude Code subscription price.Source · 19.09.2026 |
| Anthropic · API | $10 / 1M input tokens | Standard · Direct Claude API; base input, 5m/1h cache writes, cache hits and output have separate rates. Not a Claude/Claude Code subscription price.Source · 19.09.2026 |
| Anthropic · API | $50 / 1M output tokens | Standard · Direct Claude API; base input, 5m/1h cache writes, cache hits and output have separate rates. Not a Claude/Claude Code subscription price.Source · 19.09.2026 |
Evaluator & score
Composite index · published model-group index · 20.09.2026 · Higher is better
Snapshot: 2026-09-20 · 90% CI [161.36, 168.28]
Official Epoch AI index; combines own, third-party and developer-reported results. It is not a safety audit or a media-generation score.
Conditions
Epoch Capabilities Index; official model-group estimates
Official ECI model scores, Epoch AI, CC BY 4.0. Composite of own, third-party and developer-reported results. 90% bootstrap interval. Not a per-effort score; export date is the model release date, not measurement date. Methodology: https://epoch.ai/eci#documentation
Independent run · max · 20.09.2026 · Higher is better
Snapshot: 2026-09-20
Conditions
Chess Puzzles; Epoch AI own run; best score across scorers
Epoch AI own run; Chess Puzzles; version: claude-fable-5-1_max; mode: max; source id: EEGf5SDiF8jXB6NX7eR6Sa; file: chess_puzzles.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.
Measurement date: 01.09.2026
Independent run · max · 20.09.2026 · Higher is better
Snapshot: 2026-09-20
Conditions
EBR-bench; Epoch AI own run; best score across scorers
Epoch AI own run; EBR-bench; version: claude-fable-5-1_max; mode: max; source id: 8JukffGviNAYHXSdTJvswB; file: ebr_bench.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.
Measurement date: 08.09.2026
Independent run · max · 20.09.2026 · Higher is better
Snapshot: 2026-09-20
Conditions
FrontierMath Open Problems (Erdős); Epoch AI own run; best score across scorers
Epoch AI own run; FrontierMath Open Problems (Erdős); version: claude-fable-5-1_max; mode: max; source id: bloom68-fable51-8t9up8nw9358oyrl; file: frontiermath_erdos.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.
Measurement date: 01.09.2026
Independent run · max · 20.09.2026 · Higher is better
Snapshot: 2026-09-20
Conditions
FrontierMath-Tier-4-v2-Private; Epoch AI own run; best score across scorers
Epoch AI own run; FrontierMath-Tier-4-v2-Private; version: claude-fable-5-1_max; mode: max; source id: T56N3X4KLA3xz7tf5aCMGb; file: frontiermath_tier_4_v2.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.
Measurement date: 01.09.2026
Independent run · max · 20.09.2026 · Higher is better
Snapshot: 2026-09-20
Conditions
FrontierMath-Tiers-1-3-v2-Private; Epoch AI own run; best score across scorers
Epoch AI own run; FrontierMath-Tiers-1-3-v2-Private; version: claude-fable-5-1_max; mode: max; source id: g7dXwZH2tWvqLg3X5idGs2; file: frontiermath_tiers_1_3_v2.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.
Measurement date: 01.09.2026
Independent run · high · 20.09.2026 · Higher is better
Snapshot: 2026-09-20
Conditions
MirrorCode; Epoch AI own run; best score across scorers
Epoch AI own run; MirrorCode; version: claude-fable-5-1_high; mode: high; source id: mirrorcode-ml-2l-claude-fable-5-1; file: mirrorcode.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.
Measurement date: 10.09.2026
Independent run · max · 20.09.2026 · Higher is better
Snapshot: 2026-09-20
Conditions
Mock AIME 2024/2025; Epoch AI own run; best score across scorers
Epoch AI own run; source version: claude-fable-5-1_max; file: otis_mock_aime_2024_2025.csv; row: mRAASXsUuoJmc2oR5G89zR.
Measurement date: 01.09.2026
Independent run · max · 20.09.2026 · Higher is better
Snapshot: 2026-09-20
Conditions
Mystery Game Puzzles; Epoch AI own run; best score across scorers
Epoch AI own run; Mystery Game Puzzles; version: claude-fable-5-1_max; mode: max; source id: dBHxnnTzLGz3nHis5LET6t; file: mystery_game_puzzles.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.
Measurement date: 01.09.2026
Independent run · max · 20.09.2026 · Higher is better
Snapshot: 2026-09-20
Conditions
SimpleQA Verified; Epoch AI own run; best score across scorers
Epoch AI own run; SimpleQA Verified; version: claude-fable-5-1_max; mode: max; source id: ExyL3GN8s34tizrXV3VmS3; file: simpleqa_verified.csv. CC BY 4.0, Epoch AI. Snapshot 2026-09-20. Source column Best score (across scorers), not AIpedia's selection of the best effort.
Measurement date: 01.09.2026