BODY: An AI model good enough at finding security holes that its maker won't let just anyone touch it is now being handed to three times as many partners. Anthropic has announced a major expansion of "Project Glasswing," the controlled early-access program for its Claude Mythos Preview system.
Claude Mythos Preview is described as having an exceptionally high capability for discovering software vulnerabilities—the kind of flaws that, in the wrong hands, become the raw material for cyberattacks. Precisely because of that power, Anthropic has kept the model out of general release, offering it only to a vetted set of partners under tight conditions.
Under the newly announced expansion, that circle of partners grows from roughly 50 to around 150. The program also reaches across more than 15 countries, signaling that Anthropic wants a geographically diverse base of testers probing the system before any broader rollout.
The logic is defensive. As AI lowers the barrier to discovering and exploiting vulnerabilities, security teams worry that attackers will weaponize similar capabilities first. By putting Claude Mythos Preview in the hands of trusted defenders—security firms, infrastructure operators, and researchers—Anthropic is betting that the same tool that could power attacks can instead harden systems ahead of an AI-driven threat landscape.
The insider take
From Tokyo, this kind of staged, invite-only rollout reads as a deliberate hedge against the dual-use problem that haunts every powerful security tool. Japan's enterprises and government bodies have been notably cautious about generative AI, citing exactly these risks, so a program that gates access and emphasizes defensive use is likely to land well with local CISOs. Whether Japanese firms appear among the expanded partner list will be telling—the country's critical-infrastructure operators have every incentive to test such a system early, but historically move slowly on anything labeled "preview." Watch for how this frames the eventual commercial release.
Originally reported by GIGAZINE (Japanese).