From chaotic lines outside the courthouse to the presiding judge who runs a precise schedule, here is how the Tesla CEO's testimony went.

Musk originally sued Altman and OpenAI in 2024, alleging that his OpenAI co-founders blindsided him when they steered away from the company’s original nonprofit mission, ultimat

In his second day on the stand in the trial he launched against OpenAI, Elon Musk said the AI start-up he'd helped found had strayed from its charitable mission.

Elon Musk became visibly irritated on the witness stand Wednesday as an attorney for OpenAI questioned whether the billionaire backed off his financial commitment to the startup in its early years.

On his third day of testimony, Elon Musk will be cross-examined by lawyers from OpenAI and Microsoft. His answers on the stand grew testy on Wednesday.

Elon Musk, the Tesla CEO, world's richest man and OpenAI cofounder, took the stand Tuesday in a high-stakes trial revolving around a bitter feud with his former friend Sam Altman that could reshape the future development of artificial intelligence

Elon Musk took the stand for a second day of testimony against OpenAI and its leaders in a lawsuit that could reshape the future of artificial intelligence, as the emerging technology has sent ripples through the economy and financial markets.

Tesla Inc. tallied up Elon Musk’s annual compensation for the first time since shareholders approved his moonshot pay package, and it’s a doozy: $158 billion.

Remember the "Tesla Takedown" of 2025? Yeah, me neither. Elon Musk certainly doesn’t. The Tesla CEO added $500 billion in net worth last year, according to Forbes, and is on track to become the world’s first trillionaire this year despite the ...

Elon Musk acknowledged there was no contract with OpenAI regarding the terms of his donation to the company when it was first founded as a nonprofit research organization more than a decade ago.