Claude Sonnet 4.6
ECI#36
152Claude Sonnet 4.6 is a closed-weights model from Anthropic, released February 17, 2026. It has an ECI score of 152 and ranks 36th of 249 tracked models. At the time of its release, it ranked 6th of 187 tracked models.
Claude Sonnet 4.6 vs select alternatives
| Domain | Benchmark | Claude Sonnet 4.6 | |||
|---|---|---|---|---|---|
ECI scoreBest score 166 | 152 | 150 | 155 | 152 | |
| Ranking | #36 | #45 | #24 | #38 | |
| Computer use | OS WorldBest score 72% | ||||
| Conceptual reasoning | ARC-AGI-2Best score 95% | ||||
ARC-AGI-1Best score 99% | |||||
| Games | Chess PuzzlesBest score 72% | ||||
Mystery Game PuzzlesBest score 84% | |||||
| Mathematics | OTIS Mock AIME 2024-2025Best score 100% | ||||
| Science | GPQA DiamondBest score 96% | ||||
| Software engineering | SWE-bench VerifiedBest score 83% | ||||
| World knowledge | SimpleQA VerifiedBest score 76% |
