Mathematician Tristan Buckmaster accuses OpenAI of training its models on his private chat data after the company claimed to independently solve a complex Navier-Stokes math problem using an approach strikingly similar to his own. The dispute escalated when OpenAI offered Buckmaster partial credit for the breakthrough on the condition that he remove his co-author, an Anthropic employee, from the publication. Refusing to drop his colleague, Buckmaster rushed to publish their work independently, raising significant concerns about AI companies potentially exploiting user data for model training.