Terminal-Bench 2.1 (Fable/Mythos) — leaderboard
Metric: Mean Reward (%). Source: www-cdn.anthropic.com. 5 models tracked.
Top models
| # | Model | Score |
|---|---|---|
| 1 | Claude Mythos 5 | 88 |
| 2 | Claude Fable 5 | 84.3 |
| 3 | GPT-5.5 | 83.4 |
| 4 | Claude Opus 4.8 | 82.7 |
| 5 | Gemini 3.1 Pro (Preview) | 70.7 |
Interactive version: theaggregate.ai/benchmark?slug=terminal-bench-2-1-fable-mythos · How the rankings work · Data refreshed daily, snapshot 2026-07-22.