xAI v. Colorado Attorney General (D. Colo.), with U.S. intervention — challenge to the Colorado AI Act (SB 24-205)

Summary

xAI sued in the U.S. District Court for the District of Colorado to block Colorado's AI Act (SB 24-205). On April 24, 2026, the Justice Department moved to intervene, alleging the Act violates the Equal Protection Clause. On April 27, 2026, a magistrate judge entered a stipulated order: xAI would defer its preliminary-injunction motion until after rulemaking under SB 24-205 or a replacement law, and Colorado's Attorney General would not enforce in the meantime. Colorado then enacted SB 26-189 (signed May 14, 2026), which repeals and reenacts the 2024 Act as a narrower automated decision-making technology law. Dismissal or mootness was not confirmed.

Key dates

1. April 24, 2026Filed
2. October 16, 2026Checked against sources
3. October 21, 2026Checked against sources

Developments are added when the record is reviewed. Next review: January 15, 2027.

Evidence

Each passage is quoted from its source. The quoted passages are re-checked against the live pages every month.

1. The Justice Department moved to intervene in a lawsuit filed by artificial intelligence company xAI, challenging a new Colorado law that prohibits so-called “algorithmic discrimination.”

   Supports: DOJ intervened in xAI's suit (it did not file its own preemption suit)

   The Justice Department alleges that the Colorado law violates the Equal Protection Clause of the Fourteenth Amendment

   Supports: Legal theory: Equal Protection, not preemption

   Justice Department Intervenes in xAI lawsuit Challenging Colorado's 'Algorithmic Discrimination' Law U.S. Department of Justice, Office of Public Affairs Primary source

2. On April 27, 2026, Magistrate Judge Cyrus Y. Chung granted a stipulated order sought by xAI and Colorado's attorney general

   Supports: Stipulated order of April 27, 2026

   On May 14, 2026, Senate Bill 26-189 ( SB 189 ) was signed into law, significantly scaling back Colorado's first-in-the-nation artificial intelligence (AI) law

   Supports: Replacement law signed May 14, 2026

   Colorado AI law in flux: Comprehensive replacement bill signed after federal court blocks predecessor's enforcement McDermott Will & Schulte (via JD Supra) Reporting or analysis

3. The act repeals and reenacts those provisions with new requirements regarding the use of automated decision-making technology in consequential decisions.

   Supports: SB 26-189 repeals and reenacts SB 24-205's provisions

   SB26-189 Automated Decision-Making Technology Colorado General Assembly Primary source