Claude Opus 5
ECI#10
165Claude Opus 5 is a closed-weights model from Anthropic, released July 24, 2026. It has an ECI score of 165 and ranks 10th of 240 tracked models. At the time of its release, it ranked 1st of 207 tracked models.
Claude Opus 5 vs select alternatives
| Domain | Benchmark | Claude Opus 5 | |||
|---|---|---|---|---|---|
ECI scoreBest score 173 | 165 | 164 | 163 | 159 | |
| Ranking | #10 | #11 | #13 | #24 | |
| Games | Chess PuzzlesBest score 79% | ||||
Mystery Game PuzzlesBest score 90% | |||||
Earthborne Rangers (EBR-bench)Best score 90% | |||||
| Mathematics | FrontierMath ErdősBest score 4% | ||||
FrontierMath Tiers 1-3 (v2)Best score 95% | |||||
FrontierMath Tier 4 (v2)Best score 100% | |||||
| Multimodal | Furniture Assembly BenchmarkBest score 90% | ||||
| Software engineering | MirrorCodeBest score 98% | ||||
| World knowledge | SimpleQA VerifiedBest score 94% |
