CharXiv Reasoning (Fable/Mythos No Tools) — leaderboard
Metric: Score (%). Source: www-cdn.anthropic.com. 3 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | Claude Mythos 5 | 88.9 |
| 2 | Claude Mythos Preview | 86.2 |
| 3 | Claude Opus 4.8 | 80.5 |
Interactive version: theaggregate.ai/benchmark?slug=charxiv-reasoning-fable-mythos-no-tools · How the rankings work · Data refreshed daily, snapshot 2026-07-22.