California’s Generative Artificial Intelligence Training Data Transparency Act (AB 2013) became operative on January 1, 2026, mandating that any developer offering a generative AI system to California residents disclose detailed information about the data used for training. The required documentation must cover twelve specific categories and applies retroactively to systems launched or substantially altered since January 1, 2022.
The statute does not contain its own enforcement or penalty provisions; instead, it is expected to be enforced through the state’s Unfair Competition Law, allowing action by the attorney general and potentially private parties. A federal court recently rejected a preliminary injunction sought by xAI, confirming the law’s validity after its first constitutional test.
Source: Corporate Compliance Insights