Elon Musk has taken legal action against OpenAI, alleging the organization violated its founding mission to develop AI for public benefit. The trial, which began on April 27, 2026, in the US District Court for the Northern District of California, centers on Musk's claim that OpenAI shifted from its nonprofit roots to a profit-driven model, benefiting insiders and corporate partners like Microsoft. Musk, who donated approximately $44 million to OpenAI, argues these funds were misappropriated following the organization's strategic pivot. OpenAI's defense counters that no binding contract required it to remain a nonprofit, challenging the fraud allegations. They also suggest Musk's motivations are competitive, pointing to his own AI venture, xAI. The case raises broader questions about the ability of nonprofits to restructure into profit-driven entities and could set a precedent affecting AI organizations' operational models and partnerships.