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released 7 June 2026, per models.dev · listed on OpenRouter 9 June 2026 · anthropic/claude-fable-5
The archive holds no first-party launch post for this model yet.
Other tracked companies’ own announcements naming this model — each is that platform’s claim, not the lab’s.
on Developing Enterprise Frontier Safeguards with our customers
on Developing Enterprise Frontier Safeguards with our customers
on Developing Enterprise Frontier Safeguards with our customers
on Developing Enterprise Frontier Safeguards with our customers
on Bringing the cybersecurity capabilities of Claude Mythos 5 to more defenders
on Bringing the cybersecurity capabilities of Claude Mythos 5 to more defenders
on Bringing the cybersecurity capabilities of Claude Mythos 5 to more defenders
on Bringing the cybersecurity capabilities of Claude Mythos 5 to more defenders
on Bringing the cybersecurity capabilities of Claude Mythos 5 to more defenders
on Bringing the cybersecurity capabilities of Claude Mythos 5 to more defenders