Anthropic’s restricted Claude Mythos model may be coming to Claude Code By Mayank Parmar May 25, 2026 01:07 PM Anthropic appears to be preparing for the public rollout of "Mythos," which was announced in April as a restricted model that poses major security risks to private and public software. …
… On Tuesday, Axios reported that the Cybersecurity and Infrastructure Security Agency CISA didn’t have access to Mythos Preview, which Anthropic has touted as a powerful tool for finding and patching security vulnerabilities. …
… Mythos was announced in April as a restricted model and was made available only to select companies, including security researchers. At that time, Anthropic cited major "security" risks with the Mythos model and decided against a public rollout. …
Anthropic’s tightly controlled rollout of Claude Mythos has taken an awkward turn. …
BT is the first UK firm to join Anthropic's Project Glasswing High-risk Claude Mythos Preview model is limited to select partners only UK infrastructure set for major security boost – BT already blocks 4m attacks daily BT has become the first UK company to publicly confirm membership of Anthropic’s… …
… The consortium, dubbed Project Glasswing, will explore Mythos Preview’s advanced hacking and other cybersecurity capabilities and assess the best ways to improve software and hardware defenses before capabilities like the ones in Mythos Preview proliferate more broadly across other models and inevi… …
… Mythos itself is still restricted to a small subset of approved users. …
… One factor in this shift may be Anthropic’s limited April rollout of its powerful Mythos model, which the company said had flagged “thousands of high-severity vulnerabilities, including some in every major operating system and web browser.” Mythos also seemed to create an opening to thaw tensions b… …
… But while Anthropic has spent much of the extended Mythos rollout warning about cybersecurity, it is biology where Fable’s guardrails are the most obvious — and most limiting. …
… While Anthropic claims its Claude Opus 4.6 can barely find zero-days, Mythos Preview can pop up working exploits 72.4 percent of the time. It's a good thing Anthropic has limited its use for now; if it lives up to its hype, Mythos would crash the internet in a day. …
