claude-mythos-preview to Retire June 30, Migrate to claude-mythos-5
Anthropic will retire claude-mythos-preview on June 30, 2026, according to the company’s official Model Deprecations page. The model has been marked as deprecated, with claude-mythos-5 listed as the recommended replacement. Users currently relying on claude-mythos-preview will need to migrate ahead of the retirement date. Note that claude-mythos-5 is currently invitation-only and gated behind Project Glasswing….