Claude Mythos Preview (Early Snapshot): benchmark results
Anthropic internal snapshot reported as 'Mythos Pre. Early' in METR's November 5, 2026 AECI assessment. This report-specific identity remains distinct from other snapshots and released products. The source establishes private access, not a public release date; plotted dates describe availability to most Anthropic employees. Provider: Anthropic. Access: Private.
Aggregate Rating 1845 ± 37, rank #40 of 10916 rated models, from 1 benchmark results.
Strongest benchmark results
| Benchmark | Score | Metric | Percentile |
|---|---|---|---|
| Anthropic ECI - October 2026 Fit (METR Assessment) | 162.3 | AECI Score | 45 |
Interactive version: theaggregate.ai/model?slug=claude-mythos-preview-early-snapshot · How It Works · Data refreshed daily, snapshot 2026-11-08.