Gov. JB Pritzker (D-IL) signed a first-in-the-nation bill on Monday to mandate third-party safety audits for large-scale artificial intelligence models run by top developers.

The bipartisan legislation, known as the Artificial Intelligence Safety Measures Act, requires Anthropic and OpenAI, among other frontier AI firms that earn more than $500 million in revenue, to identify, disclose, and mitigate risks while enabling independent inspections of AI systems that fall under the state’s jurisdiction. Illinois is the first state to require such oversight.