California has created the first nutrition label for generative AI (Gen AI). The AI Training Data Transparency Act (CAIT‑D) requires an AI developer, which is broadly defined, to post on its website 12 details about datasets it uses for training AI. This article, with insights from attorneys at BakerHostetler, Carlton Fields, IAPP and Luminos Law, explains the new requirements, CAIT‑D’s benefits and shortcomings for downstream AI governance professionals, and how it compares to requirements in the E.U. and Colorado laws on AI. It also discusses the extent to which the law applies to workplace use of AI and the many companies adapting Gen AI models. See “How to Address the Colorado AI Act’s ‘Complex Compliance Regime’” (Jun. 5, 2024).