Anthropic is expanding Claude Mythos Preview from about 50 Project Glasswing partners to about 200 vetted organizations.

This model is much closer to a cyber weapon detector than a normal coding assistant, since it can find weak spots in software and sometimes prove the attack path by building a working test exploit.

The select group is basically a defensive priority list. The list includes power, healthcare, water, communications, hardware, governments, nonprofits, and key software maintainers, with security checks before any group gets the model.

With this priority access Anthropic is trying to create a patching head start before similar AI-assisted exploit discovery becomes common across the industry.

Anthropic says partners have already found 10,000+ high- or critical-severity flaws.

Anthropic is still not making Mythos fully public because its own testing says the model can find subtle old bugs, chain small issues into bigger exploits, and help non-experts reach outcomes that previously required elite security skill.

The poin is that other top frontier models usually flag suspicious code, while Mythos can inspect a codebase, form a theory about a bug, test it in a sandbox, read the failure, adjust the plan, and repeat until it has proof.