claude-mythos-preview

claude-mythos-preview (Anthropic) is marked legacy, with no shutdown date announced yet.

Provider

Anthropic

Shutdown

not announced

Announced

Jun 9, 2026

Replace with

no replacement named

Provider says

Deprecated (tentative retirement: 'To be announced')

• Anthropic labels it Deprecated but has not announced a retirement date; research preview (Project Glasswing), invite-only.

Source: https://platform.claude.com/docs/en/about-claude/model-deprecations · report a wrong date