# Anthropic Claude claude-mythos-5-1 — lifecycle date eolFrom is now 2027-09-01

For Anthropic Claude claude-mythos-5-1, product is claude; field changed is eolFrom; new value is 2027-09-01; detected is 2026-09-21, recorded from its source on 2026-09-21; source re-checked 2026-10-26.

- **Product:** claude _(verified: appears in the quote below)_
- **Product label:** Anthropic Claude
- **Release cycle:** claude-mythos-5-1 _(verified: appears in the quote below)_
- **Field changed:** eolFrom _(verified: appears in the quote below)_
- **New value:** 2027-09-01 _(verified: appears in the quote below)_
- **Detected:** 2026-09-21 _(our reading, not quoted from the source)_

## What the source says

> {"name":"claude-mythos-5-1","codename":null,"label":"Claude Mythos 5.1","releaseDate":"2026-09-01","isLts":false,"ltsFrom":null,"isEoas":false,"eoasFrom":null,"isEol":false,"eolFrom":"2027-09-01"

## Source

- https://endoflife.date/api/v1/products/claude

Last verified: 2026-10-26. Review by: 2026-11-09.
Part of [Software end-of-life date changes — which dates moved and what they were before](https://referencesource.org/software-eol-change-feed/).