Bill
AB 853
California mandates AI developers disclose training data sources and risk assessments for large language models, establishing first-of-its-kind state transparency requirements effective immediately upon Governor approval.
AB 853, the California AI Transparency Act, requires developers of large language models and other advanced AI systems to disclose their training data sources, content filtering practices, and potential risks before deployment in California. The law establishes transparency standards and reporting requirements for AI systems that meet specified capability thresholds, with enforcement mechanisms through the state attorney general.
As AI systems increasingly influence consequential decisions affecting Californians—from hiring to healthcare to criminal justice—this law addresses a significant information gap by requiring companies to publicly document how their systems work and what data trains them. This represents one of the first state-level mandatory AI transparency requirements and could influence similar legislation nationwide while potentially increasing compliance costs for AI developers operating in California.
Compiled from official sources — confirm details with the bill’s official record.
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