California Adopts Landmark AI Law: New Transparency, Safety, and Reporting Requirements for Frontier Model Developers

On September 29, 2025, California enacted into law Senate Bill 53, the Transparency in Frontier Artificial Intelligence Act (TFAIA), a sweeping legislative framework aimed at enhancing transparency, safety, and accountability in the development and deployment of advanced artificial intelligence (AI) models by developers. The law introduces new obligations for AI developers, establishes incident reporting mechanisms, creates research initiatives, and provides robust whistleblower protections….
By: A&O Shearman