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Anthropic's new Mythos Preview surfaced a 27-year-old vulnerability in OpenBSD — the most-audited operating system in commercial software — and generated 181 working Firefox exploits in a benchmark where Claude Opus 4.6 managed two. Eleven organizations are inside the launch cohort. The rest of us aren't, and the next Mythos won't be gated. On April 7, Anthropic announced Claude Mythos Preview, a