Anthropic’s Claude Fable 5 Launch — and a Fast Lesson in AI Export Policy
On June 9, 2026, Anthropic released Claude Fable 5 and Claude Mythos 5, the first models in its new Mythos tier sitting above Claude Opus. The two share the same underlying model, with Fable 5 carrying additional safety measures around biology, cybersecurity, and AI research and development. It was a significant step up the model ladder for the company, and for a few weeks it looked like a straightforward, well-received launch.