Anthropic has finished training Claude Mythos and is piloting it with early customers. The Capybara edition is reportedly ‘dramatically better’ than Opus 4.6 at programming and reasoning, and particularly good at finding security vulnerabilities. Meanwhile, the 1M context beta on Sonnet 4.5/4 retires April 30 — Sonnet 4.6 and Opus 4.6 get it at standard pricing. This is relevant because Dan’s entire DanOS stack runs on Claude Code.