Claude Sonnet 4
ECI#99
142Claude Sonnet 4 is a closed-weights model from Anthropic, released May 22, 2025. It has an ECI score of 142 and ranks 99th of 249 tracked models. At the time of its release, it ranked 7th of 139 tracked models. At $3/Mtok for input tokens and $15/Mtok for output tokens, it is more expensive per token than similarly-capable models.
Input price$3 / 1M tokens
Output price$15 / 1M tokens
ParametersUnknown
Training computeUnknown
Claude Sonnet 4 vs select alternatives
Reasoning
| Domain | Benchmark | Claude Sonnet 4 | |||
|---|---|---|---|---|---|
ECI scoreBest score 166 | 142 | 141 | 142 | 141 | |
| Ranking | #99 | #103 | #100 | #101 | |
| Computer use | OS WorldBest score 72.1% | ||||
| Conceptual reasoning | ARC-AGI-2Best score 95.0% | ||||
ARC-AGI-1Best score 98.5% | |||||
| Mathematics | MATH Level 5Best score 98.1% | ||||
OTIS Mock AIME 2024-2025Best score 100.0% | |||||
| Science | Humanity's Last ExamBest score 46.5% | ||||
GPQA DiamondBest score 95.8% | |||||
| Software engineering | METR Time HorizonsBest score 1044.8 | 74.9 | 60.4 | — | 31.2 |
Aider PolyglotBest score 88.0% |
