Project Glasswing is getting much larger as Anthropic widens controlled access to Claude Mythos Preview, its most sensitive cybersecurity-focused AI model. According to 9to5Mac, the expansion brings the partner list to around 200 organizations after Anthropic adds roughly 150 new groups to the initial cohort of about 50.
That number is the key detail. This is no longer a small test with a few major technology companies. Anthropic says the new organizations are based in more than 15 countries, and many operate critical infrastructure or maintain software used by governments and large institutions. The added sectors include power, water, healthcare, communications, and hardware.
Project Glasswing turns Mythos into a defensive program
Anthropic’s own Glasswing expansion announcement says early partners have already found more than 10,000 high- or critical-severity security flaws while using Claude Mythos Preview to scan codebases. The company also estimates that for most partners, a major attack on their code could affect more than 100 million people.
The cautious rollout is tied to the model’s dual-use nature. Mythos Preview can help defenders find vulnerabilities faster, but similar capabilities could also make attacks cheaper and more automated if released without strong safeguards. Anthropic says each new partner must meet security requirements before getting access.
The timing also matters. Anthropic says it expects many other AI companies to have Mythos-class models within 6 to 12 months, which raises pressure on software vendors and open-source maintainers to adapt before similar cyber capabilities become widely available. That forecast makes the expansion less like a product beta and more like an early warning for the software supply chain.
At the same time, Anthropic says it is working toward broader customer access to Mythos-level capabilities. The public release depends on stronger safeguards that can prevent misuse while still letting security teams use the model for patching, disclosure, penetration testing, and pre-release checks.
You can follow more developments in Technowatt’s Artificial Intelligence coverage.