California Generative AI Training Data Transparency Act (AB 2013)

Properties

jurisdiction: US, California
level: state
domain: transparency
status: in-effect
scope: Requires developers of generative AI systems publicly available to Californians (released on or after January 1, 2022) to disclose training data on their website.
obligations: Developers must post on their website documentation including: a high-level summary of datasets used; dataset sources and owners; how datasets serve the AI's intended purpose; number of data points; types of data points; whether data includes copyrighted, trademarked, or personal information; whether datasets were purchased or licensed; time period of data collection; and whether synthetic data generation was used.
effectiveDate: 2026-01-01
enactedDate: 2024-09-28
appliesTo: developers of generative AI systems or services publicly accessible to California consumers, released or substantially modified on or after January 1, 2022
officialUrl: https://leginfo.legislature.ca.gov/faces/billTextClient.xhtml?bill_id=202320240AB2013
notes: Signed September 28, 2024. First US law establishing comprehensive training-data disclosure requirements. Exemptions for systems designed solely for security, aircraft operation, or national defense. Litigation update (re-verified 2026-08-22): xAI filed a federal constitutional challenge (xAI v. Bonta, C.D. Cal.) on December 29, 2025, asserting compelled-speech and trade-secret claims. On March 4, 2026, Judge Jesus G. Bernal denied xAI's motion for a preliminary injunction, so the law remains in effect while the case proceeds on the merits.

California Generative AI Training Data Transparency Act (AB 2013)

Properties

jurisdiction: US, California
level: state
domain: transparency
status: in-effect
scope: Requires developers of generative AI systems publicly available to Californians (released on or after January 1, 2022) to disclose training data on their website.
obligations: Developers must post on their website documentation including: a high-level summary of datasets used; dataset sources and owners; how datasets serve the AI's intended purpose; number of data points; types of data points; whether data includes copyrighted, trademarked, or personal information; whether datasets were purchased or licensed; time period of data collection; and whether synthetic data generation was used.
effectiveDate: 2026-01-01
enactedDate: 2024-09-28
appliesTo: developers of generative AI systems or services publicly accessible to California consumers, released or substantially modified on or after January 1, 2022
officialUrl: https://leginfo.legislature.ca.gov/faces/billTextClient.xhtml?bill_id=202320240AB2013
notes: Signed September 28, 2024. First US law establishing comprehensive training-data disclosure requirements. Exemptions for systems designed solely for security, aircraft operation, or national defense. Litigation update (re-verified 2026-08-22): xAI filed a federal constitutional challenge (xAI v. Bonta, C.D. Cal.) on December 29, 2025, asserting compelled-speech and trade-secret claims. On March 4, 2026, Judge Jesus G. Bernal denied xAI's motion for a preliminary injunction, so the law remains in effect while the case proceeds on the merits.