Humanity's Last Exam No Tools (Mythos 5.1 System Card): leaderboard
Metric: Accuracy (%). Source: www-cdn.anthropic.com. 3 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | Claude Fable 5.1 (Max) | 60.9 |
| 2 | Claude Fable 5 | 57.8 |
| 3 | Claude Opus 5 | 56.6 |
Interactive version: theaggregate.ai/benchmark?slug=humanity-s-last-exam-no-tools-mythos-5-1-system-card · How It Works · Data refreshed daily, snapshot 2026-09-19.