Claude Opus 4.6
ECI#33
156Claude Opus 4.6 is a closed-weights model from Anthropic, released February 5, 2026. It has an ECI score of 156 and ranks 33rd of 253 tracked models. At the time of its release, it ranked 3rd of 171 tracked models.
Claude Opus 4.6 vs select alternatives
| Domain | Benchmark | Claude Opus 4.6 | |||
|---|---|---|---|---|---|
ECI scoreBest score 169 | 156 | 150 | 157 | 153 | |
| Ranking | #33 | #58 | #24 | #48 | |
| Games | Chess PuzzlesBest score 76% | ||||
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% | |||||
| Multimodal | Furniture Assembly BenchmarkBest score 83% | ||||
| Science | GPQA DiamondBest score 96% | ||||
| Software engineering | SWE-bench VerifiedBest score 83% | ||||
| World knowledge | SimpleQA VerifiedBest score 76% |
