Claude Fable 5
ECI#9
163Claude Fable 5 is a closed-weights model from Anthropic, released June 9, 2026. It has an ECI score of 163 and ranks 9th of 253 tracked models. At the time of its release, it ranked 1st of 212 tracked models.
Claude Fable 5 vs select alternatives
| Domain | Benchmark | Claude Fable 5 | |||
|---|---|---|---|---|---|
ECI scoreBest score 169 | 163 | 159 | 163 | 155 | |
| Ranking | #9 | #17 | #10 | #35 | |
| Games | Chess PuzzlesBest score 76% | ||||
Earthborne Rangers (EBR-bench)Best score 76% | |||||
Mystery Game PuzzlesBest score 84% | |||||
| Mathematics | FrontierMath Tiers 1-3 (v2)Best score 94% | ||||
FrontierMath Tier 4 (v2)Best score 100% | |||||
| Multimodal | Furniture Assembly BenchmarkBest score 83% | ||||
| Science | GPQA DiamondBest score 96% | ||||
| Software engineering | MirrorCodeBest score 77% | ||||
| World knowledge | SimpleQA VerifiedBest score 76% |
