Claude Sonnet 4
anthropic/claude-sonnet-4
Creator
AnthropicReleased
2025-05-22Weights
closedContext
not reportedPrice in / out per Mtok
not reported / not reportedState
rankedHealth summary
4 of 5 scores sit on benchmarks that still discriminate. Every number here has been measured independently. 1 sits on benchmarks with a high risk of test-set contamination.
Epoch Capability Index
141.7 (138.7–143.1)
Epoch AI's Capability Index. A composite score with no benchmark health record behind it, so it is never this site's ranking basis and is always attributed. Published by Epoch AI under CC BY 4.0. fetched 2026-10-19
Scores
| Benchmark | Config | Score | Harness | Provenance | Measured | Health |
|---|---|---|---|---|---|---|
| Knowledge | ||||||
| GPQAnearing saturation | base | 66.7% | not reported | ind. | 2025-05-22 | superseded |
| Humanity's Last Examactive | base | 7.8% | not reported | ind. | 2025-05-22 | disputed |
| Reasoning | ||||||
| ARC-AGI-2nearing saturation | base | 1.3% | not reported | ind. | 2025-05-22 | superseded |
| On benchmarks that no longer discriminateKept visible on purpose. These are often the numbers a launch announcement leads with. | ||||||
| ARC-AGIsaturated | base | 23.8% | not reported | ind. | 2025-05-22 | saturatedcontaminatedsuperseded |