Cook County, Ill. (Chancery): Calendar 9 Courtroom Procedures, AI Provision (Hon. Cecilia…
Hon. Cecilia A. Horan · Circuit Court of Cook County, County Department, Chancery Division, Calendar 9
Verified May 8, 2026
- Citation
- Calendar 9 Courtroom Procedures, AI Provision (Hon. Cecilia A. Horan, Cook County)
- Order date
- April 5, 2024
Summary
Any use of large language model artificial intelligence (such as ChatGPT) in the preparation of briefs or other submissions must be indicated in the caption of the motion, brief, or other filing.
What does the order require?
- Any use of large language model artificial intelligence (such as ChatGPT) in the preparation of briefs or other submissions must be indicated in the caption of the motion, brief, or other filing.
- Failure to disclose may result in sanctions.
- Disclosure mechanism is a caption indication, not a separate certificate.
Practice areas: state civil, state commercial
What the rule requires
Judge Horan’s Calendar 9 procedures (effective April 5, 2024) impose a single operational requirement: any use of large language model AI (the rule names ChatGPT) in preparing briefs or other submissions must be indicated in the caption of the filing. The disclosure goes in the caption itself, not a separate certificate. Failure to disclose may result in sanctions.
The disclosure-in-caption mechanism is unusual; most chambers rules require a separate declaration or certificate at the end of the filing. Caption disclosure is more visible to opposing counsel and to the court at first glance, which may explain Judge Horan’s choice.
R&G data correction
R&G’s AI Court Order Tracker labels this entry simply “Horan.” Some readings of R&G’s tracker have conflated this with Judge Joan H. Lefkow, who is an N.D. Ill. (federal) judge in a different court entirely. The actual judge is Hon. Cecilia A. Horan, Cook County Circuit Court Chancery Division, Calendar 9. Different judge, different court, different jurisdiction.
Quotable language
“Any use of large language model artificial intelligence, such as ChatGPT, in the preparation of briefs or other submissions to the Court must be indicated in the caption on the motion, brief or other filing with the Court.”
“Failure to do so may result in sanctions.”
Primary source
Cook County Calendar 9 Standing Order PDF (Hon. Cecilia A. Horan), ocj-web-files