Claude Opus 4.5
ECI#49
150Claude Opus 4.5 is a closed-weights model from Anthropic, released November 24, 2025. It has an ECI score of 150 and ranks 49th of 253 tracked models. At the time of its release, it ranked 3rd of 172 tracked models.
Claude Opus 4.5 vs select alternatives
| Domain | Benchmark | Claude Opus 4.5 | |||
|---|---|---|---|---|---|
ECI scoreBest score 167 | 150 | 147 | 153 | 150 | |
| Ranking | #49 | #66 | #39 | #47 | |
| 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% | |||||
OTIS Mock AIME 2024-2025Best score 100% | |||||
| Science | GPQA DiamondBest score 96% | ||||
| Software engineering | SWE-bench VerifiedBest score 83% | ||||
| World knowledge | SimpleQA VerifiedBest score 76% |
