Gov. JB Pritzker signed SB 315, the Artificial Intelligence Safety Measures Act, on July 6, making Illinois the third state to regulate frontier AI developers and the first anywhere in the country to require annual independent third-party audits. The signature completes what Illinois lawmakers are calling a tri-state regulatory bloc: Illinois, California, and New York together account for roughly 40% of the U.S. AI market, and their overlapping rules now function as a de facto national standard in the absence of one from Washington.

The mechanics are tight. Any developer above $500 million in annual revenue is classified as a “large frontier developer” and must publish a catastrophic-risk framework, submit to yearly audits by evaluators with documented technical expertise in frontier-model safety, and report incidents to the state within 72 hours, or 24 hours where death or serious injury is imminent. “Catastrophic risk” is defined concretely: more than 50 deaths or serious injuries, or over $1 million in property damage. New York, by contrast, requires only a single audit at qualification.

Attorney General Kwame Raoul framed the law as Illinois “stepping up to fill the gap” left by federal inaction. That framing carries the vote math behind it. The bill passed the Illinois House unanimously and cleared the Senate with only five Republican no votes. Both OpenAI and Anthropic backed it.

Industry pushback was audible but narrow. TechNet’s Ninia Linero warned in a May 20 committee hearing that firms would be left making “highly subjective determinations” without national standards, an objection that reads, in hindsight, less like a plea for federal preemption than a concession that the states now set the terms. The governor’s press release lists a Jan. 1, 2027 effective date; Capitol News Illinois and Governing both report Jan. 1, 2028. Either way, the auditing regime that frontier labs will actually operate under is being written in Springfield, Sacramento, and Albany, not Washington.

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