Anthropic is giving Claude Mythos Preview to around 150 more organizations.
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Inside the fight over Claude Mythos 5
… Claude Mythos 5 and Fable 5 are built on the same foundation as Anthropic’s Mythos Preview, which Anthropic dubbed too dangerous to publicly release. …
Anthropic is making the security tools it’s used with Claude Mythos Preview just a bit more available.
… Anthropic also plans to expand Project Glassing to “additional partners” and has published a dashboard of open source vulnerabilities disclosed by Mythos Preview. …
OpenAI just released its answer to Claude Mythos
… Its launch comes just over a month after rival Anthropic announced Claude Mythos, a security-focused AI model it claimed was too dangerous to publicly release and only shared privately as a part of its own initiative, dubbed Project Glasswing. …
Mozilla is sharing more details about some of the 271 Firefox bugs identified by Claude Mythos Preview.
… Link: Behind the Scenes Hardening Firefox with Claude Mythos Preview – Mozilla Hacks - the Web developer blog | https://hacks.mozilla.org/2026/05/behind-the-scenes-hardening-firefox/ | Mozilla Hacks – the Web developer blog
Anthropic releases its first Mythos-class model Claude Fable
… Those users will be able to upgrade to Mythos 5, Anthropic said, adding that it plans to “expand access over time through a more systematic trusted-access program.” Anthropic did not respond on the record to The Verge’s request for comment explaining how either model relates to Claude Mythos Previe… …
Anthropic releases a new Opus model amid Mythos Preview buzz
… In Opus 4.7’s system card, Anthropic wrote that Opus 4.7 doesn’t even advance the company’s “capability frontier,” since Claude Mythos Preview received higher results “on every relevant evaluation.” For security reasons, Anthropic is only currently making Mythos Preview available privately to selec… …
Mythos v. Firefox.
Anthropic’s cybersecurity-focused AI model found 271 bugs in Firefox 150, Mozilla CTO Bobby Holley said, calling Claude Mythos Preview “every bit as capable” as top security researchers. …
Today’s Vergecast: The Mythos mess and your AI questions, answered.
Anthropic and the US government are once again at odds, this time over the Claude Fable 5 model that either is, or is not, or might be, far too dangerous to release to the world. …
AI cybersecurity updates for MDASH, Mythos, and GPT-5.5.
On Wednesday, the AISI, which evaluates AI models for the British government, said both Anthropic’s Claude Mythos Preview and OpenAI’s GPT-5.5 showed progress well above previous trends on cybersecurity testing. …