AB 853 — California AI Transparency Act amendments (Chapter 674, Statutes of 2025)

Summary

Amends the California AI Transparency Act (SB 942). It postpones the original act's operative date to August 2, 2026. From January 1, 2027, it adds duties for large online platforms to detect and surface provenance data embedded in content they distribute, and bars GenAI system hosting platforms from knowingly offering GenAI systems that do not place the required disclosures. From January 1, 2028, capture device manufacturers must offer users the option to include a latent disclosure in content captured on new devices.

Key dates

1. October 16, 2026Checked against sources
2. October 21, 2026Checked against sources

Developments are added when the record is reviewed. Next review: October 16, 2027.

Evidence

Each passage is quoted from its source. The quoted passages are re-checked against the live pages every month.

1. Current Status: Passed (2025-10-13: Chaptered by Secretary of State – Chapter 674, Statutes of 2025.)

   Supports: Chapter number and chaptering date

   This bill would delay the operation of the California AI Transparency Act until August 2, 2026. This bill would, beginning January 1, 2027, additionally require a large online platform, as defined, to, among other things related to the provenance of content on the platform,

   Supports: Delayed operative date; platform duties from January 1, 2027

   The bill would also require, beginning January 1, 2028, a capture device manufacturer, with respect to any capture device the capture device manufacturer first produced for sale in the state on or after January 1, 2028

   Supports: Capture device duties from January 1, 2028

   AB 853: Legislative Counsel's digest (Digital Democracy) CalMatters Digital Democracy Reporting or analysis