Anthropic is endorsing California's SB 53, a bill aimed at regulating powerful AI systems developed by frontier AI companies, highlighting its alignment with Anthropic's advocacy for thoughtful AI regulation. The bill, supported by a group of academics and industry experts, emphasizes a 'trust but verify' approach by implementing disclosure requirements instead of prescriptive technical mandates. SB 53 mandates large AI developers to publish safety frameworks, release transparency reports, and report critical safety incidents, while providing whistleblower protections and accountability measures. It exempts smaller companies to avoid unnecessary regulatory burdens and seeks to maintain a competitive yet transparent environment for AI development. Anthropic commends the leadership of Senator Wiener and Governor Newsom and views SB 53 as a solid foundation for future AI governance, emphasizing the need for adaptable regulations that keep pace with technological advancements.