# Claude Sonnet 5

> Claude Sonnet 5 on LegalForecastBench: micro Brier 0.1585 across 387 units.

Canonical: https://www.legalforecastbench.org/models/claude-sonnet-5/

- Provider: Anthropic
- Reasoning: Adaptive thinking (provider default)
- Public release: 2026-06-30
- Training cutoff: January 2026 (training-data cutoff)
- Eligibility: eligible. The reported training-data cutoff (January 2026) predates the first scored decision on June 30, 2026.
- Micro Brier: 0.1585
- Equal-case Brier: 0.1596
- Accuracy: 75.7% (293 of 387)
- High-confidence predictions: 60, of which 5 were wrong

Ranked comparison: https://www.legalforecastbench.org/#leaderboard