How a Yale AI-cheating dispute became a 13-count federal lawsuit

Thierry Rignol, a student in Yale University's Executive MBA program, filed a 13-count federal lawsuit against Yale after the school suspended him for a year and gave him an F in a course, alleging that an AI detection tool called GPTZero falsely flagged his exam answers as AI-generated. Rignol, who paid $208,500 in tuition and claims he was on track to graduate first in his class, also alleges the disciplinary process was a sham to censor his conservative political speech. The lawsuit, filed in February 2025, has grown to 125 docket entries and a third amended complaint, and is far from trial.

Thierry Rignol is furious at Yale. Rignol paid Yale $208,500 in tuition for its Executive MBA program. But after he was accused of cheating, the school suspended him for a year and gave him an F in the course Sourcing and Managing Funds. This happened despite the fact that Rignol was a “top student, on track to graduate first in his class,” he says. As a result, Rignol missed out on being named class valedictorian, an honor he claims to have earned “under Yale’s own stated criterion.” So Rignol sued the school. His lawsuit has been running since February 2025. It opened with a motion to “Proceed in Fictitious Name”—which was denied—and has since sprawled across 125 docket entries https://www.courtlistener.com/docket/69607031/rignol-v-yale-university/ and a highly unusual third amended complaint. It appears to be nowhere near trial. What issue was big and loud enough to produce all this sound and fury? Artificial intelligence, of course. Rignol’s final exam in Sourcing and Managing Funds was flagged as possibly composed with the aid of generative AI. Rignol’s professor used an AI detection tool called GPTZero on Rignol’s text. The tool said that whole sections were likely AI-generated. But such tools have well-known weaknesses; most are unreliable, and even Yale has noted that trying to police AI use through detection tools is infeasible. In Rignol’s telling, his long, perfectly formatted test answers were the product of his own intelligence. “It was entirely expected,” his lawsuit says, “that Rignol’s exam writing would be thorough, well-organized, and display near perfect punctuation and grammar, attributes consistent with his academic excellence.” There was also the matter of his French background. Rignol calls out “GPTZero’s known bias against non-native English speakers” like himself, and he argues that detectors can mistake the formal, structured prose of such writers for AI-generated text. But it’s not just tools like GPTZero that enrage Rignol. He believes that Yale itself is against him and that the whole “sham” disciplinary process was designed to censor his “protected conservative political speech” after he advocated in courses for “smaller government, pro-business policies, and skepticism of DEI.”