California AB 2013: Generative AI Training Data Transparency
Developers of public generative AI systems must publish a summary of their training data. In force since 1 January 2026; xAI’s court challenge has so far failed.
Developers of generative AI systems made publicly available in California, released or substantially modified on or after 1 January 2022. Narrow exemptions, for example for security and national-security systems.
AB 2013 requires developers of generative AI systems offered to Californians, and released or substantially changed since 1 January 2022, to post documentation about the data used to train them, including a high-level summary of the datasets.
xAI sued to block the law in December 2025. A federal court refused a preliminary injunction on 4 March 2026; the appeal is due to be argued at the Ninth Circuit on 18 November 2026.