Claude Opus 4.1
ECI#97
145Claude Opus 4.1 is a closed-weights model from Anthropic, released August 5, 2025. It has an ECI score of 145 and ranks 97th of 240 tracked models. At the time of its release, it ranked 6th of 133 tracked models.
Claude Opus 4.1 vs select alternatives
| Domain | Benchmark | Claude Opus 4.1 | |||
|---|---|---|---|---|---|
ECI scoreBest score 173 | 145 | 143 | 145 | 146 | |
| Ranking | #97 | #108 | #96 | #91 | |
| Agent | GDPvalBest score 50% | ||||
| Games | Mystery Game PuzzlesBest score 90% | ||||
| Mathematics | FrontierMath Tiers 1-3 (v2)Best score 95% | ||||
FrontierMath Tier 4 (v2)Best score 100% | |||||
OTIS Mock AIME 2024-2025Best score 100% | |||||
| Science | Humanity's Last ExamBest score 55% | ||||
GPQA DiamondBest score 97% | |||||
| Software engineering | METR Time HorizonsBest score 17 hr 25 min | 1 hr 54 min | 1 hr 40 min | 38 min 44 sec | — |
SWE-bench VerifiedBest score 83% |
