Anthropic Accidentally Leaks Details About Its Most Powerful AI Model Yet

A data mishap has exposed Anthropic's closely guarded secrets. Nearly 3,000 internal assets spilled onto the public web after the company failed to mark files as private in its content management system.

The leaked materials reveal "Claude Mythos," which Anthropic calls "by far the most powerful AI model we've ever developed." The company has confirmed the leak and says the model represents a "step change" in AI performance. It's currently in trials with select early access customers.

The leak also unveiled a new unreleased model tier called "Capybara," designed to sit above Anthropic's existing Opus tier. Most striking: internal documents warn that Claude Mythos poses serious cybersecurity risks and could help hackers run cyberattacks that "farout pace the efforts of defenders."

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