Glossary term
Project Glasswing
Project Glasswing is Anthropic's invitation-only program that provides selected organizations access to the unrestricted Mythos editions, including the Preview and Mythos 5.
Who it serves
Glasswing concentrated on cyberdefense and critical-infrastructure organizations — roughly 50 orgs for the April 2026 Preview, including US-government participation. It is not self-serve; participation is arranged directly with selected entities.
Why it matters
The unrestricted Mythos 5 edition, with safety classifiers lifted, is available only through Glasswing. The public alternative is the safeguarded Fable 5 edition.
Sources & further reading
- Anthropic — Fable & Mythos access noticeOfficialanthropic.com
Facts on this page link to their source. Quotes are kept under 15 words and attributed; figures labelled unofficial are third-party until Anthropic publishes system-card numbers.