Published on April 22, 2026 at 11:58 Updated on April 23, 2026 at 10:52 Comment 0 𝕏 Print © Anthropic Claude Mythos, the model that Anthropic wanted to keep out of reach, has fallen into the hands of a group of mysterious internet users. Since the day of the announcement, they have been using the generative AI without Anthropic's knowledge. The startup had everything planned to protect Claude Mythos, but its precautions were not enough to prevent a new lea