Claude Mythos Preview
No shutdown before this date. Claude Mythos Preview stays on Azure AI Foundry until at least Apr 2, 2027.
≥ 6 mo- Earliest retirement
- ≥ 170 daysApr 2, 2027 · Azure AI Foundry
Dates on every platform
2 listings · a floor is the earliest possible date
| Platform | Model ID and status | Deprecated | Shuts down | Replacement |
|---|---|---|---|---|
| Claude APIAnthropic: Model deprecations (opens in a new tab) · checked Oct 14, 2026 | claude-mythos-previewLegacy | None set | – | |
| Azure AI FoundryMicrosoft: Model retirement schedule - Microsoft Foundry (opens in a new tab) · checked Oct 14, 2026 | claude-mythos-previewPreview | – | ≥ 6 moNot sooner than | – |
Deprecated on June 9, 2026. Anthropic has not announced a retirement date.
Gated research preview. Microsoft Entra ID authentication only.
Preview dates on Azure are a floor. Preview deployments are upgraded to a newer version or retired with at least 30 days' notice.
What breaks when you move off Claude Mythos Preview
No breaking changes are recorded for Claude Mythos Preview.