Create a watch on this topic Receive the next developments if any, with an AI watch configured from this article. Create my free watch Anthropic launched Claude Fable 5 and Claude Mythos 5 on June 9, 2026, two products that, according to Anthropic, are based on the same underlying model and differ only in their safeguards: Fable 5 for general use with active security classifiers, and Mythos 5 reserved for a restricted circle of cyber defenders via Project