# claude-mythos-5-1 — Active — shutdown Not sooner than September 1, 2027

For claude-mythos-5-1, provider is Anthropic; lifecycle status is Active; shutdown / retirement date is Not sooner than September 1, 2027; platform / deployment scope is Anthropic API / Claude Platform on AWS / Microsoft Foundry, recorded from its source on 2026-09-21; source re-checked 2026-11-11.

- **Provider:** Anthropic _(our reading, not quoted from the source)_
- **Model ID / API name:** claude-mythos-5-1 _(verified: appears in the quote below)_
- **Lifecycle status:** Active _(verified: appears in the quote below)_
- **Shutdown / retirement date:** Not sooner than September 1, 2027 _(verified: appears in the quote below)_
- **Platform / deployment scope:** Anthropic API / Claude Platform on AWS / Microsoft Foundry _(our reading, not quoted from the source)_

## What the source says

> | claude-mythos-5-1 | Active | N/A | Not sooner than September 1, 2027 |

## Where each value comes from

This source states these in separate places, so each value is shown with the passage that states it.

### Platform / deployment scope

> The dates on this page apply to Anthropic-operated platforms: the Claude API, Claude Platform on AWS, and Microsoft Foundry. Partner-operated platforms (Amazon Bedrock and Google Cloud) set their own retirement schedules, so a model's lifecycle status and dates can differ.

## Source

- https://platform.claude.com/docs/en/about-claude/model-deprecations.md
- https://platform.claude.com/docs/en/about-claude/model-deprecations

Last verified: 2026-11-11. Review by: 2026-12-11.
Part of [AI model deprecation and retirement dates by provider](https://referencesource.org/ai-model-deprecation-and-retirement/).