Humanity's Last Exam (Fable/Mythos Tools): leaderboard
PhD-level questions at the frontier of human expert knowledge. This slice reports Anthropic's own runs from the Claude Fable 5 / Mythos 5 system card, Tools configuration; small frontier-model pool.
Metric: Score (%). Source: www-cdn.anthropic.com. 5 models tracked.
Top models
| # | Model | Score | Overall rank |
|---|---|---|---|
| 1 | Claude Mythos Preview | 64.7 | #4 |
| 2 | Claude Mythos 5 | 64.5 | #2 |
| 3 | Claude Opus 4.8 | 57.9 | #37 |
| 4 | GPT-5.5 | 52.2 | #31 |
| 5 | Gemini 3.1 Pro | 51.4 |
Interactive version: theaggregate.ai/benchmark?slug=humanity-s-last-exam-fable-mythos-tools · How It Works · Data refreshed daily, snapshot 2026-10-20.