Claude Mythos Preview
Anthropic / 144 days ago
Claude Mythos Preview is a preview-stage release from Anthropic. Limited-access Anthropic frontier preview launched with Project Glasswing for defensive cybersecurity work. A model-level official source is attached, so this can enter source-first editorial review.
Draft handoff
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Draft file
editorial/release-drafts/2026-04-07-claude-mythos-preview-release-brief.md