California enacts SB 53, the first US frontier AI transparency law
Governor Gavin Newsom signed SB 53, the Transparency in Frontier Artificial Intelligence Act, requiring large frontier AI developers to publish safety frameworks, report critical safety incidents, and protect whistleblowers.
Key facts
- Signed 29 September 2025
- Applies to large frontier developers
- Requires published frontier AI frameworks and critical safety incident reporting
- Whistleblower protections for AI lab employees
- Followed Newsom's 2024 veto of the broader SB 1047
What happened
California, home to most frontier labs, passed a transparency-focused frontier AI law.
Why it matters
The first binding US law aimed specifically at frontier model developers' catastrophic-risk practices.
Changelog
- 2026-09-29: created
Related events
Sources (2)
- officialGovernor Newsom signs SB 53 (Office of the Governor)
- discussionWikipedia: Transparency in Frontier Artificial Intelligence Act
id: 2025-09-29-california-sb-53 · updated 2026-09-29 · open in the interactive timeline