Anthropic deleted a line from its own retirement notice that used to read " Claude Mythos Preview ( claude-mythos-preview ) is deprecated. To migrate to Claude Mythos 5 ( claude-mythos-5 ), see the migration guide ".
AnthropicDEPRECATIONREMOVEDWED SEP 23, 17:54
The line, as the page carries it
- Claude Mythos Preview ( claude-mythos-preview ) is deprecated. To migrate to Claude Mythos 5 ( claude-mythos-5 ), see : " Claude Mythos Preview ( claude-mythos-preview ) is deprecated. To migrate to Claude Mythos 5 ( claude-mythos-5 ), see the migration guide ."
The record
| DOCUMENT | https://platform.claude.com/docs/en/about-claude/model-deprecations |
|---|---|
| SOURCE | anthropic-deprecations |
| ROW | Claude Mythos Preview ( claude-mythos-preview ) is deprecated. To migrate to Claude Mythos 5 ( claude-mythos-5 ), see |
| OPERATION | removed |
| BEFORE | Claude Mythos Preview ( claude-mythos-preview ) is deprecated. To migrate to Claude Mythos 5 ( claude-mythos-5 ), see the migration guide . |
| AFTER | nothing, the row was deleted |
| READ AT | 2026-09-23T17:54:03.649Z |
| SIGNALS | modelId, lifecycle |