Claude Opus 4.6
ECI#37
156Claude Opus 4.6 is a closed-weights model from Anthropic, released February 5, 2026. It has an ECI score of 156 and ranks 37th of 240 tracked models. At the time of its release, it ranked 2nd of 155 tracked models.
Claude Opus 4.6 vs select alternatives
| Domain | Benchmark | Claude Opus 4.6 | |||
|---|---|---|---|---|---|
ECI scoreBest score 173 | 156 | 152 | 157 | 153 | |
| Ranking | #37 | #61 | #31 | #55 | |
| Games | 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 97% | ||||
| Software engineering | SWE-bench VerifiedBest score 83% | ||||
| World knowledge | SimpleQA VerifiedBest score 94% |
