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In context: Anthropic's latest release is really a story about control, not just capability. The company is offering two versions of the same underlying model: Claude Mythos 5 for a small circle of trusted partners, and Claude Fable 5 for everyone else. The split reflects a core challenge Anthropic is still trying to solve – how to deploy an extremely capable system into the wild without simultaneously handing attackers a new class of offensive tools.
Mythos has already shown what it can do when it is not heavily restricted. Since April, when an earlier preview was sent to about 150 organizations under the banner of Project Glasswing, users have reported more than 10,000 critical security flaws in their own systems. Those same capabilities could also be used by attackers looking to break in, rather than to patch security holes.
For that reason, Mythos 5 is staying behind the glass for now. Anthropic is keeping it in the hands of a "small group of cyberdefenders and infrastructure providers," along with select biology researchers, and is coordinating with US government agencies as part of the rollout. Access is effectively on a need-to-know basis, with the company signaling that a broader "trusted access program" will come later.
