Tag: Mythos

Claude Mythos is Anthropic’s most powerful AI model ever built. Here’s everything we know about the leaked model, its capabilities, the Capybara codename, and when you can use it.

On June 9, 2026, Anthropic released Claude Fable 5, the first model in a brand new top tier the company calls the Mythos class. Seven weeks later it still sits at number one on Arena’s text leaderboard, the largest human-preference board in AI, with 16,056 votes behind a 1507.6 rating. What changed since launch is […]