UK regulators will brief major banks on Anthropic’s Claude Mythos Preview within days, after the Fed and US Treasury held emergency meetings on the AI’s cyber capabilities.

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UK financial regulators including the Bank of England, FCA, HM Treasury, and NCSC are set to brief major banks, insurers, and exchanges about Anthropic's unreleased Claude Mythos Preview model within days. The model has already triggered emergency meetings with the US Treasury, Federal Reserve, and Bank of Canada. Mythos is described as capable of autonomously identifying and exploiting zero-day vulnerabilities across all major operating systems and browsers, and was the first AI to complete a full end-to-end cyber-range attack. Anthropic's Project Glasswing gives ~40-50 organisations controlled early access, with named partners including AWS, Apple, Google, Microsoft, and JPMorgan Chase, backed by $100M in usage credits. Critics including Bruce Schneier have questioned whether the episode is partly a PR play, while others see genuine opportunity to patch long-hidden vulnerabilities. The situation is politically complicated by Anthropic's ongoing dispute with the US Department of Defense.

UK banks get their Mythos briefing within days