California's AI Transparency Act became operative August 2, 2026. It requires covered GenAI providers with more than 1 million monthly users accessible in California to offer free provenance-verification tools and specified manifest and latent disclosures for AI-generated images, video, and audio; separate large-platform duties begin January 1, 2027. The statute allows civil penalties of $5,000 per violation, with each day treated separately.
California's AI Transparency Act became operative on August 2, 2026, under Chapter 25 of the state's Business and Professions Code. The current statute applies its first set of duties to covered providers: companies or people that produce a generative-AI system with more than 1 million monthly visitors or users and make it publicly accessible in California.
Covered providers must offer a free tool that lets a user submit image, video, or audio content, or a URL, to assess whether the provider's system created or altered it. The tool must output detected system-provenance data, support an API, and avoid outputting personal-provenance data. The law also limits collection and retention of user information and submitted content.
Two forms of disclosure
For image, video, and audio generated or altered by a covered system, providers must offer users the option to include a clear, conspicuous manifest disclosure identifying the material as AI-generated. Providers must also include a latent disclosure in AI-generated media. To the extent technically feasible and reasonable, that embedded record conveys the provider, system name and version, creation or alteration time, and a unique identifier. It must be detectable by the provider's verification tool, align with widely accepted industry standards, and be extraordinarily difficult to remove where technically feasible. These requirements concern provenance records, not a guarantee that every synthetic file can be identified from its pixels or audio alone. They also focus on image, video, and audio; the operative sections do not impose the same disclosure workflow on text-only output.
Platform and device deadlines come later
AB 853, signed in October 2025, added separate obligations with later operative dates. Starting January 1, 2027, large online platforms must detect standards-compliant provenance data where technically feasible, make it inspectable to users, and avoid knowingly stripping compliant provenance records or digital signatures. The statute defines a large platform using a threshold of more than 2 million unique monthly users during the preceding 12 months.
For capture devices first produced for sale in California on or after January 1, 2028, manufacturers must offer a latent-disclosure option and embed it by default to the extent technically feasible and standards-compliant. Violations can carry a $5,000 civil penalty, and each day of violation is treated as a separate offense. The attorney general, a city attorney, or a county counsel may bring an action. For AI vendors and platforms, the immediate implementation work is therefore concrete: preserve provenance through generation and transformation, expose reliable verification interfaces, minimize retained user data, and track which statutory duties apply at each deadline.
Key Points #
- 1The provider provisions became operative August 2, 2026; separate large-platform provenance duties begin January 1, 2027.
- 2Covered GenAI providers must offer a free verification tool and specified manifest and latent disclosures for generated image, video, and audio content.
- 3Civil penalties are $5,000 per violation, with each day treated as a separate violation under the statute.
Scoring Rationale #
The operative provider rules create immediate provenance, verification, privacy, and disclosure obligations for qualifying GenAI systems, with later platform and device deadlines and daily civil-penalty exposure.
Sources #
Primary source and supporting public references used for this report.
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