Claude Fable 5.2
ECI#1 – Best
174Claude Fable 5.2 is a closed-weights model from Anthropic, released November 9, 2026. It has an ECI score of 174 and ranks 1st of 239 tracked models.
Claude Fable 5.2 vs select alternatives
| Domain | Benchmark | Claude Fable 5.2 | |||
|---|---|---|---|---|---|
ECI scoreBest score 174 | 174 | 169 | 169 | 167 | |
| Ranking | #1 – Best | #4 | #2 | #7 | |
| Games | SpireClimbBest score 34% | ||||
Chess PuzzlesBest score 79% | |||||
Mystery Game PuzzlesBest score 90% | |||||
Earthborne Rangers (EBR-bench)Best score 90% | |||||
| Mathematics | FrontierMath Tiers 1-3 (v2)Best score 95% | ||||
FrontierMath Tier 4 (v2)Best score 100% | |||||
| Multimodal | Furniture Assembly BenchmarkBest score 90% | ||||
| Science | GPQA DiamondBest score 96% | ||||
| World knowledge | SimpleQA VerifiedBest score 94% |
