BrowseComp (Fable/Mythos Single-Agent): leaderboard
BrowseComp results as reported in the Claude Fable 5 / Mythos 5 system card, Single-Agent configuration — Anthropic-run evaluation comparing a small set of frontier models.
Metric: Score (%). Source: www-cdn.anthropic.com. Saturation forecast: Estimated already saturated. 4 models tracked.
Top models
| # | Model | Score | Overall rank |
|---|---|---|---|
| 1 | Claude Mythos 5 | 88 | #2 |
| 2 | Claude Opus 4.8 | 87.9 | #37 |
| 3 | Gemini 3.1 Pro (Preview) | 85.9 | #58 |
| 4 | GPT-5.5 | 84.4 | #31 |
No result here: #3 Claude Opus 5.5, #6 GPT-6 Astra, #7 GPT-6.1 Sol.
Interactive version: theaggregate.ai/benchmark?slug=browsecomp-fable-mythos-single-agent · How It Works · Data refreshed daily, snapshot 2026-10-20.