A United States insurer has sued the developer of ChatGPT, alleging that the chatbot engaged in the unauthorised practice of law because it was used by a litigant in proceedings against it. The case, *Nippon Life Insurance Company of America v OpenAI Foundation*, was filed in the United States District Court, Illinois in March 2026. According to the complaint, a former claimant settled a long-term disability dispute with the insurer in 2024 and signed a release. About a year later, she put her former lawyer’s correspondence recommending acceptance to ChatGPT and asked whether she was being ‘gaslighted’. The chatbot answered in the affirmative, after which she used ChatGPT to prepare litigation seeking to reopen the matter. The Insurer attributes at least 44 filings to the tool. Nippon Life advances three causes of action against OpenAI: tortious interference with the settlement contract, abuse of process arising from the volume of meritless filings, and the unauthorised practice of law. Notably, the claimant is not a defendant; the insurer has aimed its claim at the developer of the tool. OpenAI has said publicly that the complaint lacks merit.