Claude Mythos 5.1
validasserted
- Valid from
- 2026-09-01
- Valid until
- still holds
- Published
- 2026-09-01
- Recorded by AsOf
- 2026-10-31
- Checked
- 2026-10-31 · its source page states the value and the date
- Confidence
- 0.70
Sources
“September 1, 2026 We’ve launched Claude Fable 5.1 ( claude-fable-5-1 ), the successor to Claude Fable 5 for long-running agentic coding, knowledge work, and research, alongside Claude Mythos 5.1 ( claude-mythos-5-1 ) for Project Glasswing participants.”— what the page says, read 2026-10-31
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