Anthropic put a retirement notice on claude-mythos-preview, reading "Deprecated | June 9, 2026 | To be announced".
AnthropicDEPRECATIONADDEDFRI SEP 18, 19:54
The line, as the page carries it
+claude-mythos-preview: "Deprecated | June 9, 2026 | To be announced"
The record
| DOCUMENT | https://platform.claude.com/docs/en/about-claude/model-deprecations |
|---|---|
| SOURCE | anthropic-deprecations |
| ROW | claude-mythos-preview |
| OPERATION | added |
| BEFORE | Nothing was recorded because the row did not exist. |
| AFTER | Deprecated | June 9, 2026 | To be announced |
| READ AT | 2026-09-18T19:54:52.549Z |
| SIGNALS | date, modelId, lifecycle |
What went out
- BLUESKY2026-09-18 20:05Anthropic’s model deprecation page added claude-mythos-preview with "Deprecated | June 9, 2026 | To be announced". #TechBluesky