California Generative AI Training Data Transparency Act (AB 2013)

Dates and status re-checked against primary sources on September 30, 2026. How we verify

Requires developers of generative AI systems made available to Californians to post high-level documentation of the data used to train them, including dataset sources, types of data, whether copyrighted material or personal information is included, how the data was acquired, and how it was modified. It covers systems released or substantially modified since January 1, 2022, and has no minimum dataset size.

Key requirements

• Post training data documentation on your website before a covered generative AI system is made available to Californians
• Covers systems released or substantially modified since January 1, 2022, with postings due by January 1, 2026
• Describe data sources, data types, and whether copyrighted material or personal information is included
• Describe how the data was acquired, when it was collected, and how it was cleaned or modified
• Update the documentation when the system is substantially modified

Further reading

• AI Training Data Copyright: What the Bartz Ruling Means
• AI Vendor Due Diligence in 30 Minutes (Questions + Scoring Sheet)