Claude Fable 5
ECI#7
162Claude Fable 5 is a closed-weights model from Anthropic, released June 9, 2026. It has an ECI score of 162 and ranks 7th of 253 tracked models. At the time of its release, it ranked 2nd of 221 tracked models.
Claude Fable 5 vs select alternatives
| Domain | Benchmark | Claude Fable 5 | |||
|---|---|---|---|---|---|
ECI scoreBest score 167 | 162 | 158 | 162 | 155 | |
| Ranking | #7 | #12 | #6 | #31 | |
| Games | Chess PuzzlesBest score 72% | ||||
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% |
