Claude Opus 5
ECI#7
164Claude Opus 5 is a closed-weights model from Anthropic, released July 24, 2026. It has an ECI score of 164 and ranks 7th of 253 tracked models. At the time of its release, it ranked 1st of 226 tracked models.
Claude Opus 5 vs select alternatives
| Domain | Benchmark | Claude Opus 5 | |||
|---|---|---|---|---|---|
ECI scoreBest score 169 | 164 | 163 | 163 | 158 | |
| Ranking | #7 | #9 | #10 | #19 | |
| Games | Chess PuzzlesBest score 76% | ||||
Earthborne Rangers (EBR-bench)Best score 76% | |||||
Mystery Game PuzzlesBest score 84% | |||||
| Mathematics | FrontierMath ErdősBest score 4% | ||||
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% | ||||
| World knowledge | SimpleQA VerifiedBest score 76% |
