California Signs SB 53 — Frontier AI Transparency Act

Governor Gavin Newsom signed Senate Bill 53, the Transparency in Frontier Artificial Intelligence Act, on September 29, 2025. SB 53 follows the prior frontier-AI bill SB 1047, which Newsom vetoed in 2024. The new law focuses on transparency obligations, safety framework publication, and critical safety incident reporting, with civil penalties up to $1 million per violation enforceable by the California Attorney General.

Related: Transparency in Frontier Artificial Intelligence Act (TFAIA)

Source: www.gov.ca.gov