In the latest development in the high-stakes legal battle, a U.S. judge on Tuesday rejected billionaire Elon Musk’s plea for a preliminary injunction to halt OpenAI’s shift to a for-profit business model but consented to a fast-track trial in the fall of this year.

Musk does not have "the high burden required for a preliminary injunction" to block the conversion of OpenAI, said a judge in Oakland, California.

A federal court judge has dismissed Elon Musk’s bid to delay OpenAI’s shift to a for-profit strategy immediately but has agreed to speed up the trial for this fall. The ruling is an important step forward in the back-and-forth legal fight between the Tesla boss and the artificial intelligence firm he co-founded.