Anthropic on Tuesday unveiled a new "Mythos-class" model for general use, as concerns around the release of advanced artificial intelligence tools with powerful hacking capabilities deepen. The new model, Fable 5, performs at a level similar to Anthropic's most advanced Claude Mythos model, though the company says it has built-in safeguards to prevent users from prompting it to carry out a cyberattack or to detail how to create a bioweapon.