Earlier this year, Anthropic executives said that their new AI model, Claude Mythos, had such powerful capabilities for harm that they would not release it publicly. On Tuesday, the company said it was making an altered version of Mythos available to the public, promising “new guardrails” that thwart the model’s best-in-class performance in hacking and bioweapons research. Anthropic said Claude Fable 5 was the “same underlying model” as Mythos, but its responses for certain topics like cybersecu...