… 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… …
… 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. …
Anthropic’s tightly controlled rollout of Claude Mythos has taken an awkward turn. After spending weeks insisting the AI model is so capable at cybersecurity that it is too dangerous to release publicly, it appears the model fell into the wrong hands anyway. …
… Anthropic currently has no plans to release the model publicly due to concerns that it could be weaponized. “We’re investigating a report claiming unauthorized access to Claude Mythos Preview through one of our third-party vendor environments,” an Anthropic spokesperson said in a statement to Bloom… …
… Separately, XBOW released data suggesting “frontier models have taken a major step forward in vulnerability discovery.” Meanwhile, Microsoft said its multi-model agentic setup, MDASH, was used to discover 16 CVEs in this week’s Patch Tuesday updates and is the leader on the CyberGym security evalua… …
… This month, Anthropic followed a similar playbook with Claude Mythos, though with much greater fanfare, and it bungled the model’s secure release in embarrassing ways. …
… In a release about Mythos Preview, Anthropic wrote that it had already been in “ongoing discussions with US government officials about Claude Mythos Preview and its offensive and defensive cyber capabilities.” Earlier this month, when The Verge asked for details, Dianne Penn, a head of product mana… …
… Richard Lawler May 13 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. …
… A week after announcing Mythos, the company released Claude Opus 4.7, which for the first time built in safeguards meant to block malicious cybersecurity requests. Security professionals who want to use the model defensively can apply to the company’s Cyber Verification Program. …
… Anthropic recently released Claude Opus 4.7 and also announced Mythos Preview, a non-public model it says is uniquely advanced in cybersecurity. OpenAI quickly followed with GPT-5.4-Cyber, its own model trained to flag cybersecurity vulnerabilities. …