Claude Opus 4.6
ECI#27
155Claude Opus 4.6 is a closed-weights model from Anthropic, released February 5, 2026. It has an ECI score of 155 and ranks 27th of 253 tracked models. At the time of its release, it ranked 3rd of 180 tracked models.
Claude Opus 4.6 vs select alternatives
| Domain | Benchmark | Claude Opus 4.6 | |||
|---|---|---|---|---|---|
ECI scoreBest score 167 | 155 | 150 | 157 | 153 | |
| Ranking | #27 | #49 | #18 | #39 | |
| 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% | |||||
| Multimodal | Furniture Assembly BenchmarkBest score 83% | ||||
| Science | GPQA DiamondBest score 96% | ||||
| Software engineering | SWE-bench VerifiedBest score 83% | ||||
| World knowledge | SimpleQA VerifiedBest score 76% |
