California, United States · Legislation

California Training Data Transparency Rules

Developers publicly offering generative AI systems or services in California must publish a high-level description of training data and update it after substantial modifications.

Current status
In force
Published or updated
28 September 2024
Effective date
1 January 2026
Last verified
19 August 2026

Prepared by Longan Bay Area AI Legal Research Center based on official public materials.

01

Scope of application & addressees

  • Developers publicly offering generative AI systems or services in California
  • Businesses making substantial modifications to covered systems
  • Teams responsible for training data, model documentation and public disclosures

02

Core regulatory mandates & key requirements

01Publish a high-level description of datasets or training-data sources.

02Disclose prescribed points such as source, type, time range and inclusion of personal or copyrighted material.

03Prepare and update documentation before public release or a substantial modification.

03

Enforcement & compliance timeline

The Governor approved AB 2013.

The documentation requirements became operative.

Primary text

Statutory & regulatory text

PROJECT ENQUIRY

Need to evaluate this regulation against your system architecture?

Consult with our regulatory team →