Yale AI cheating lawsuit turns exam dispute into 13-count federal case
Thierry Rignol says Yale wrongly punished him over alleged AI use; Yale says he failed to provide the exam file for months.
By Dominic Okoye · Staff Writer
· 4 min read
Thierry Rignol has turned a Yale AI cheating lawsuit into a 13-count federal case after the university suspended him for a year and gave him an F in an Executive MBA course. Rignol says he paid Yale $208,500 in tuition and was on track to finish first in his class before the dispute cost him valedictorian status and damaged his career prospects.
The case, filed in February 2025, has grown to 125 docket entries and a third amended complaint. Rignol’s claims against Yale include breach of contract, civil rights violations, emotional distress, unfair trade practices, defamation and invasion of privacy. He is seeking damages “without limitation,” expungement of disciplinary records, reversal of the F and reinstatement, although Yale says he has already returned from suspension and graduated.
What is the Yale AI cheating lawsuit about?
The fight began with the spring 2024 final exam for MGT423E, Sourcing and Managing Funds. The four-hour exam was open book but closed Internet, and the use of AI tools was prohibited. Students wrote answers on their computers, converted them to PDFs and submitted those files to instructors.
According to court filings, a teaching assistant flagged Rignol’s exam as potentially involving AI use, partly because of its length. Professor K. Geert Rouwenhorst later told a dean that GPTZero found several answers likely to be AI-generated, that one answer overlapped substantially with ChatGPT output for the same question, that Rignol did worse on a question where AI would have been less useful and that the teaching team questioned whether such a long, polished exam could be produced in the allotted time.
Rignol denies using AI. In his complaint, he argues that the writing reflected his academic record and his formal style as a non-native English speaker from France. He also says GPTZero has a known bias against non-native English speakers and submitted examples in which GPTZero allegedly classified older writings by a Yale dean and a former president as AI-generated.
The dispute is bigger than one business school exam because AI detectors are increasingly being used in high-stakes settings, despite frequent criticism that they produce unreliable results. Yale itself has noted that policing AI use through detection tools is infeasible, according to Rignol’s filings.
Why Yale says the file mattered
Yale’s defense centers heavily on the underlying document used to create Rignol’s submitted PDF. Finance professor James Choi, who led the Honor Committee investigation, emailed Rignol repeatedly in August 2024 asking for the Microsoft Word file behind the exam submission. Choi warned that failure to cooperate with the committee could be treated as a serious honor code issue.
Rignol did not provide the file before the November hearing. At the hearing, he said he had not used Microsoft Word and had drafted the exam in Apple Pages. Yale’s lawyers argue that he should have disclosed that earlier and produced the Pages file rather than treating the request as limited to a Word document.
After the hearing, Assistant Dean Wendy Tsung asked Rignol for the Pages file, which he provided that afternoon. Yale then asked him to return to campus so the committee could examine his laptop. Rignol said he could not come back on short notice. That evening, the committee found him responsible for not being forthcoming, a separate honor code violation. Later in November, it found that he violated the final exam rules and imposed the F.
Rignol says Yale denied him due process by punishing him for a charge he had not been formally told he faced. He also alleges the process was a “sham” intended to punish his conservative political views, including support for smaller government, pro-business policies and skepticism of DEI. Yale disputes those claims and says its administrators were entitled to explain possible consequences of disciplinary proceedings, including in relation to his visa status. Yale says he was in the U.S. on an investor visa, not a student visa, and that school discipline would not have revoked it.
The federal court has allowed Rignol to file a third amended complaint, but the judge warned in June 2026 that another amendment would not be allowed without extraordinary circumstances. Yale, which has been seeking dismissal, said in a July 15, 2026 motion that the expanded complaint relies on conclusory allegations rather than adequately pleaded facts.
This story draws on original reporting from Ars Technica.
