On Monday, Anthropic announced an official endorsement of SB 53, a California bill from state Senator Scott Wiener that would impose first-in-the-nation transparency requirements on the world’s largest AI model developers. Anthropic’s endorsement marks a rare and major win for SB 53, at a time when major tech groups like CTA and Chamber for Progress are lobbying against the bill. “While we believe that frontier AI safety is best addressed at the federal level instead of a patchwork of state regulations, powerful AI advancements won’t wait for consensus in Washington.” said Anthropic in a blog post. “The question isn’t whether we need AI governance—it’s whether we’ll develop it thoughtfully today or reactively tomorrow. SB 53 offers a solid path toward the former.” If passed, SB 53 would require frontier AI model developers like OpenAI, Anthropic, Google, and xAI to develop safety frameworks, as well as release public safety and security reports before deploying powerful AI models. The bill would also establish whistleblower protections to employees that come forward with safety concerns.

Full report : Anthropic becomes the first major AI company to back SB 53, a California bill that requires large AI companies to disclose safety testing protocols.