California AI Transparency Act Summary: Who Must Comply, and by Which Date
People keep calling this one deadline. It is four groups of companies with three different dates, and mixing them up is why so many plans are wrong. What the law asks for If a machine made it, say so. Big AI companies must put a visible label on the images, video and sound their tools produce. They must hide a tag inside the file so software can read it. And they must give the public a free tool to check any file. The date that changed SB 942 was signed on 19 September 2024. It said the rules start 1 January 2026. AB 853 was signed on 13 October 2025 and pushed the start to 2 August 2026, adding three more types of company. Many pages online still print the old date because nobody went back to fix them. Here are the correct dates for the AI Transparency Act . Group 1: big AI companies, from 2 August 2026 You build the AI tool, it has over a million users a month, and people in California can use it. You owe all three duties. The free checker also has to return the...