AI Daily Digest — 2026-03-30

Kun Lu

- One minute read - 158 words

Key Highlights

  • A CMS configuration error exposed Anthropic’s unreleased “Mythos” model, described as occupying a new tier above Opus with frontier-leading cyber capabilities that “could help hackers outpace defenders”

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Anthropic’s secret ‘Mythos’ model — Rundown

A CMS misconfiguration left thousands of unpublished assets publicly accessible, including draft documentation for Anthropic’s upcoming Claude Mythos model. The leaked materials describe a system designed for a new “Capybara” tier above the current Opus class, flagged as “currently far ahead of any other AI model in cyber capabilities.” Anthropic acknowledged to Fortune that it is testing “a new general purpose model with meaningful advances in reasoning, coding, and cybersecurity” but neither confirmed nor denied the Mythos branding. The incident raises dual-use concerns — Anthropic’s own documentation warned the model’s cyber prowess “could help hackers outpace defenders” — and echoes prior strategic-leak patterns seen with OpenAI’s Q* and Strawberry rumors.

References

  1. Anthropic’s secret ‘Mythos’ model — Rundown, 2026-03-30 [blog]