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Claude Fable 5 gave users access to Mythos-class power, but its hidden safeguards turned a safety feature into a trust problem for Anthropic.
Mythos was introduced in April as part of Project Glasswing, a partnership among top-tier tech organizations and Anthropic formed to find and fix vulnerabilities in internet infrastructure. It was restricted to only certain organizations because a tool that can find previously unknown vulnerabilities to fix them can also be used to find previously unknown vulnerabilities to exploit them.