Connecticut's AI law (SB 5, the CART Act) starts taking effect: frontier-AI whistleblower protections and 'AI is no defense' rule
On Oct 1, 2026 the first provisions of Connecticut's Artificial Intelligence Responsibility and Transparency (CART) Act took effect. The law is SB 5, Public Act 26-15, signed by Gov. Lamont on May 27, 2026. Now in force: whistleblower protections for people working on large frontier models, an amendment saying an employer's use of an automated decision tool is no defense to a discrimination claim, AI-related disclosures in layoff (WARN) notices, AI subscription disclosures and standard AI definitions. Companion-chatbot rules follow on Jan 1, 2027, AI hiring notices on Oct 1, 2027 and youth social-media rules on Jan 1, 2028.
Key facts
- Bill SB 5 (39 sections), Public Act 26-15, signed May 27, 2026 by Gov. Ned Lamont
- In force Oct 1, 2026: frontier-AI whistleblower protections; 'use of an automated employment decision tool is not a defense' amendment to the Fair Employment Practices Act; WARN notices must say whether layoffs relate to AI or other tech change; AI subscription term disclosures; AI provenance-data requirements and standard definitions
- Large frontier developers must set up internal anonymous reporting processes by Jan 1, 2027 (FPF)
- Jan 1, 2027: companion chatbots must detect suicidal ideation with evidence-based methods, disclose they are not human (every hour for minors, every three hours for adults), and must not engage minors romantically
- Oct 1, 2027: employer notices and frameworks for AI used in employment decisions; Jan 1, 2028: social-media age assurance and parental consent
- Enforcement mainly by the Attorney General as unfair trade practices; no private right of action except for the social-media provisions
- Sen. James Maroney: 'This is a start. This is not a finish; this is not a ceiling. This is the floor.'
What happened
After several failed attempts led by Sen. James Maroney, Connecticut passed a broad AI law in 2026, combining employment, frontier-AI, chatbot and online-safety rules. Its first wave took effect on Oct 1.
Why it matters
Connecticut joins California (SB 53) and New York (RAISE Act) in protecting frontier-AI whistleblowers. That makes such protections a common feature of state AI law while Washington talks of voluntary accords.
Unverified: whether whistleblower protections and the provenance-data rules are fully operative on Oct 1 or partly phased (sources summarize them differently); the full Public Act text was not read.
Changelog
- 2026-10-01: created
Related events
Sources (4)
- pressCT Mirror: New CT AI, data privacy laws go into effect Oct. 1. What to know
- pressFPF: SB 5 in Five, what to know about Connecticut's new AI law
- pressSigma Law Group: Connecticut's AI law starts October 1
- pressPYMNTS: New AI and privacy rules for businesses take effect in Connecticut
id: 2026-10-01-connecticut-ai-law-takes-effect · updated 2026-10-01 · open in the interactive timeline