Anthropic says these topics are too dangerous to let its Fable 5 model talk about
Summary
Anthropic released Claude Fable 5, a Mythos-class model with safeguards that block certain topics such as cybersecurity, biology, and chemistry. The publicly accessible Fable 5 redirects sensitive queries to the older Opus 4.8 model or denies them, while Mythos 5 remains available to a limited group via Glasswing. The article discusses classifier-based safety, red-team testing, and planned access expansions and pricing.