In brief
Anthropic launched Claude Mythos 5, a restricted-access AI model for cybersecurity and scientific research.
The company also released Claude Fable 5, a version for general users that routes some sensitive requests to a less capable model.
Mythos drew scrutiny after tests showed it could autonomously discover vulnerabilities and complete complex cyberattack simulations.
Anthropic on Tuesday announced the official launch of Claude Mythos 5, a restricted-access AI model the company says has unprecedented cybersecurity capabilities, alongside Claude Fable 5, a version designed for broader public use.In a blog post, Anthropic said Mythos 5 will initially be available only to approved cybersecurity organizations, critical infrastructure operators, government partners, and selected life sciences researchers. The company says the Mythos-class AI models “have reached a threshold where they present significant risks.”“In April, we began Project Glasswing, releasing the first Mythos-class model (Claude Mythos Preview) to only a limited group of cyber defenders and critical software infrastructure providers,” Anthropic wrote. “When we did so, we stated that we hoped to eventually release Mythos-level capabilities to all our users, so long as we had developed new safeguards that were strong enough to reliably prevent misuse.”The launch follows months of concern over Mythos' ability to identify software vulnerabilities and conduct complex cybersecurity operations after news of the AI leaked online in March. Earlier this year, the U.K.'s AI Security Institute reported that a preview version became the first AI model to complete a 32-step corporate network intrusion exercise without human assistance. In April, Mozilla reported that a preview version of Mythos discovered over 271 vulnerabilities in the Firefox browser.
