Anthropic’s Fable 5 is back, and that’s no fairy tale

TL;DR Anthropic introduced its Fable 5 and Mythos 5 models last month, with advanced security research tools. Even though Anthropic took major efforts to limit abuse potential, it still pulled the models following a government directive. Fable 5 and Mythos 5 access has now been restored, and Anthropic is explaining exactly what happened.