California Governor Gavin Newsom has signed SB 53, also known as the Frontier Artificial Intelligence Act (TFAIA), establishing the first state-level law in the US requiring large artificial intelligence companies to disclose risk assessments and safety measures. The legislation mandates that AI developers with annual revenues exceeding US$500 million publish safety frameworks and report AI-related crimes or security incidents, while providing whistleblower protections. This move aims to address the current lack of comprehensive federal regulation on AI technologies.