Terminal-Bench 2.0 (Mythos Preview System Card): leaderboard
Claude Mythos Preview system-card run of Terminal-Bench 2.0, measuring terminal-based agent task completion with the Terminus harness.
Metric: Mean Reward (%). Source: www-cdn.anthropic.com. Saturation forecast: Around January 2027. 4 models tracked.
Top models
| # | Model | Score | Overall rank |
|---|---|---|---|
| 1 | Claude Mythos Preview | 82 | #4 |
| 2 | GPT-5.4 | 75.1 | #79 |
| 3 | Gemini 3.1 Pro (Preview) | 68.5 | #58 |
| 4 | Claude Opus 4.6 | 65.4 | #63 |
No result here: #3 Claude Opus 5.5, #6 GPT-6 Astra, #7 GPT-6.1 Sol.
Interactive version: theaggregate.ai/benchmark?slug=terminal-bench-2-0-mythos-preview-system-card · How It Works · Data refreshed daily, snapshot 2026-10-20.