Anthropic (Claude API) · model
claude-mythos-preview deprecation: shutdown date & replacement
Deprecated — shutdown date not announced
- Provider
- Anthropic (Claude API)
- Name
- Claude Mythos Preview
- Type
- model
- Announced
- Shutdown
- Not announced
- Replacement
- —
- Source
- Official Anthropic (Claude API) notice
Deprecated; tentative retirement date listed as 'To be announced'.
How to migrate off claude-mythos-preview
- Find every place that references it:
grep -rn --exclude-dir={node_modules,.git,dist} "claude-mythos-preview" . - Follow the provider’s migration notes in the official notice.
- Re-run your evals or a sample of real prompts — output style, token usage and pricing can change between models.
- Check config outside code too: environment variables, feature flags, prompt-management tools, and fine-tuned model references.
- Deploy before the shutdown date, and add the CI scanner so it cannot come back.
Questions
Is claude-mythos-preview deprecated?
Yes. Anthropic (Claude API) has deprecated claude-mythos-preview. It is deprecated; the shutdown date has not been announced.
When does claude-mythos-preview shut down?
Anthropic (Claude API) has not announced a shutdown date yet.
What should I use instead of claude-mythos-preview?
Anthropic (Claude API) has not named a specific replacement. Check the official source for current models.
What happens to requests to claude-mythos-preview after the shutdown?
Requests using the retired model ID fail with an error, so any code still calling it breaks. Update and deploy before the shutdown date.