Pritzker signs Illinois SB 315, first US frontier AI audit law

For the first time in the US, a state has told frontier AI labs they must open the hood to an outside auditor. Governor JB Pritzker signed Illinois' SB 315 on Monday, CBS Chicago reported, making Illinois the first state to require third-party safety audits of the largest AI developers.

The law reaches developers with more than $500 million in revenue that also cross a frontier-scale compute threshold. Those companies must publish a transparency framework describing how they apply industry standards, measure model capabilities and the chance of catastrophic risk, and identify and respond to safety incidents. They also have to employ third-party auditors to check their own compliance with that framework. As Capitol News Illinois has covered, civil penalties run up to $1 million for a first violation and $3 million for subsequent ones, the Illinois attorney general holds exclusive enforcement authority, and the law takes effect January 1, 2028.

The politics look unusual for a tech-regulation bill. It cleared the Illinois House 110-0 and the Senate 52-5, and both OpenAI and Anthropic supported it throughout the process. TechNet, a coalition of tech executives, opposed the third-party audit provision. Senate sponsor Sen. Mary Edly-Allen (D-Libertyville) compared frontier AI to the "wild, wild West" and said lawmakers cannot repeat the hands-off approach they took with social media. Pritzker himself framed the signing as filling a "glaring, but not surprising lack of leadership" from the federal government.

The honest caveat is what the reporting does not spell out: how "industry standards" get defined in practice, what qualifies a firm as a third-party auditor for frontier models, and where the "massive computing measurement" threshold actually lands. Those definitions will do more work than the headline penalty numbers.

Absent a federal frontier-AI law, one state has now set the template other attorneys general are likely to copy well before the 2028 effective date. Any lab over the $500 million line should start budgeting for audit-ready documentation now, and the assurance firms that can credibly do the auditing may be the quiet winners.