Claude Mythos Preview · deprecatedclaude-mythos-preview

validasserted

Valid from: 2026-06-09
Valid until: still holds
Published: no source on record carries a date
Recorded by AsOf: 2026-11-04
Checked: 2026-11-04 · its source page states the value and the date
Confidence: 0.95

Sources

“claude-mythos-preview Deprecated June 9, 2026 To be announced”— what the page says, read 2026-11-04

https://platform.claude.com/docs/en/about-claude/model-deprecationsprimary · platform.claude.com

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