claude-mythos-5-1 retirement date and replacement
Claude API · Model · not sooner than Sep 1, 2027
Dates
Checked Sep 25, 2026 on Anthropic's page| Not sooner than | Sep 1, 2027 (not sooner than)The earliest date the vendor gives for a current model; the real date is announced later. |
|---|---|
| Replacement | None named |
| Notice | Tentative: not sooner than this date |
| Source | platform.claude.com/docs/en/about-claude/model-deprecations |
Around the same time on Claude API
Anthropic- claude-opus-5Claude APIModel10mo or laterJul 24, 2027
- claude-fable-5-1Claude APIModel11mo or laterSep 1, 2027
- claude-opus-5-5Claude APIModel12mo or laterSep 22, 2027