Claude Fable: a glimpse of Mythos for the public
Anthropic has released Claude Fable 5, its most capable public model yet. Behind the announcement lies a simple idea: Fable appears to be a lighter and more restricted version of Mythos 5, Anthropic’s frontier model previously limited to a small group of trusted partners. While both models reportedly share the same foundation, Fable includes stronger safeguards around sensitive areas such as cybersecurity and biology. For the public, it may be the closest look yet at the capabilities of a Mythos-class system without full access to the original model.