Claude Fable 5 and Mythos 5
The same model as Mythos 5, released to the public with safeguards added; Anthropic's top-tier model.
19 daysof suspended service under export controls
Why it matters
Mythos-class capability reached ordinary users for the first time, with cyber risk managed by refusing or handing off to a weaker model.
Costs and controversy
Access was suspended on June 12 under US Commerce Department export controls, and restored on July 1 after they were lifted.
Built on
Led to
Source: anthropic.com ↗
Official page not opened for verification; URL taken from citations in multiple reports.