California has passed more AI-specific laws than any other US state. It has no single AI act; instead it layers targeted statutes. As of 2026 the frontier-model transparency law and training-data transparency law are in force, the AI Transparency Act's watermarking duties arrive in August 2026, and separate rules govern companion chatbots. Most carry meaningful penalties and reach any covered provider serving California users.
Key points
- SB 53, the Transparency in Frontier Artificial Intelligence Act, took effect January 1, 2026.
- AB 2013, generative-AI training-data transparency, took effect January 1, 2026.
- SB 942, the California AI Transparency Act, was delayed to August 2, 2026 and adds detection and provenance duties in 2027.
- SB 243 regulates companion chatbots, including disclosure and protections for minors.
- California was not named in the December 2025 federal preemption order, unlike Colorado.
Laws and instruments
Transparency in Frontier Artificial Intelligence Act (TFAIA)
SB 53 (2025); Chapter 138, Cal. Stat. 2025
Requires developers of the largest frontier models (trained above roughly 10^26 FLOPs) to publish a safety framework, report safety incidents, and protect whistleblowers.
Effective: January 1, 2026
Generative AI Training Data Transparency
AB 2013 (2024)
Requires developers of generative-AI systems to publish a high-level summary of the datasets used to train them.
Effective: January 1, 2026
California AI Transparency Act
SB 942 (2024), amended by AB 853 (2025)
Requires large generative-AI providers to offer visible and latent disclosures on AI-generated content and a free detection tool. Large platforms must surface provenance data starting in 2027.
Effective: August 2, 2026
Companion Chatbot Safeguards
SB 243 (2025)
Requires companion-chatbot platforms to tell users the bot is not human and adds safeguards, including restrictions on sexually explicit content for minors.
Effective: January 1, 2026
Timeline
- Jan 1, 2026
SB 53, AB 2013, and SB 243 take effect.
- Aug 2, 2026
SB 942 watermarking and disclosure duties take effect.
- 2027
SB 942 platform provenance-detection duties phase in.
Who it applies to
Covered providers and platforms serving California users, generally keyed to size thresholds (for example, one million monthly users for the AI Transparency Act, and a compute threshold for frontier developers).
Penalties
Vary by statute. The AI Transparency Act carries per-day civil penalties for noncompliance; the frontier act is enforced by the Attorney General.
Recent developments
January 1, 2026
King & Spalding
A wave of US state AI laws takes effect: California, Texas, Illinois
California's frontier transparency and training-data laws, Texas TRAIGA, and Illinois' AI employment amendment all took effect on the same day, a month after the federal preemption order. For now every one of them remains enforceable, and most follow the affected resident rather than the company's location.
Common questions
Does United States: California have a comprehensive AI law?
United States: California has a dedicated AI regime. California has passed more AI-specific laws than any other US state. It has no single AI act; instead it layers targeted statutes. As of 2026 the frontier-model transparency law and training-data transparency law are in force, the AI Transparency Act's watermarking duties arrive in August 2026, and separate rules govern companion chatbots. Most carry meaningful penalties and reach any covered provider serving California users.
What are the penalties for AI violations in United States: California?
Vary by statute. The AI Transparency Act carries per-day civil penalties for noncompliance; the frontier act is enforced by the Attorney General.
Who does AI regulation in United States: California apply to?
Covered providers and platforms serving California users, generally keyed to size thresholds (for example, one million monthly users for the AI Transparency Act, and a compute threshold for frontier developers).
Cite this page
Artificial Intelligence Regulations, "AI Regulation in California," reviewed July 15, 2026, https://artificialintelligenceregulations.com/jurisdictions/california.html.
Entries state the position as of the review date and link to the primary text for verification.
