Anthropic Withholds Claude Mythos Preview Over Existential Cybersecurity Risks, Triggers Emergency Government Meetings

Anthropic's Claude Mythos Preview, released only to vetted partners under Project Glasswing, has demonstrated the ability to find high-severity vulnerabilities in every major operating system and web browser, prompting the company to restrict public release. The model's capabilities triggered emergency meetings between US Treasury officials, Federal Reserve Chairman Jerome Powell, and major bank CEOs to assess cybersecurity implications. UK financial regulators are also holding urgent talks with cyber security agencies about risks posed by the model. Cybersecurity experts and IBM warn the model could compromise critical infrastructure including power grids, banking systems, and government operations.