Humanity's Last Exam With Tools (Mythos 5.1 System Card): leaderboard
Humanity's Last Exam (HLE), a 2,500-question multimodal benchmark of expert-level questions, answered with tools; accuracy in percent, higher is better. Anthropic's runs from Table 8.1.A of the Claude Fable 5.1 & Claude Mythos 5.1 System Card (September 2026); the Fable 5.1 cell, already mirrored by Vellum, is omitted.
Metric: Accuracy (%). Source: www-cdn.anthropic.com. Saturation forecast: Around July 2027. 2 models tracked.
Top models
| # | Model | Score | Overall rank |
|---|---|---|---|
| 1 | Claude Fable 5 | 63.8 | #20 |
| 2 | Claude Opus 5 | 63.6 | #16 |
No result here: #3 Claude Opus 5.5, #6 GPT-6 Astra, #7 GPT-6.1 Sol.
Interactive version: theaggregate.ai/benchmark?slug=humanity-s-last-exam-with-tools-mythos-5-1-system-card · How It Works · Data refreshed daily, snapshot 2026-11-05.