Model and API retirements

Within 30 days64Firm dates ahead558

64 within 30 days · 558 firm dates ahead

claude-mythos-5 retirement date and replacement

Claude API · Model · not sooner than Jun 9, 2027

Vendor page

Dates

Checked Nov 9, 2026 on Anthropic's page
Not sooner thanJun 9, 2027 (not sooner than)The earliest date the vendor gives for a current model; the real date is announced later.
ReplacementNone named
What it isclaude-mythos-5 stops answering on Claude API no sooner than Jun 9, 2027.
Sourceplatform.claude.com/docs/en/about-claude/model-deprecations

Around the same time on Claude API

Anthropic
Claude APIModel

claude-opus-4-8

Stops answering on Claude API no sooner than May 28, 2027.

not sooner thanMay 28, 2027
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claude-fable-5

Stops answering on Claude API no sooner than Jun 9, 2027.

not sooner thanJun 9, 2027
Claude APIModel

claude-sonnet-5

Stops answering on Claude API no sooner than Jun 30, 2027.

not sooner thanJun 30, 2027