Elon Musk on Thursday sparred with an attorney for OpenAI during his third day of testimony in the contentious trial over the company’s pivot from nonprofit status to a for-profit venture valued at hundreds of billions of dollars.

The most obvious Elon Musk investment is his $1.6 trillion electric vehicle and technology company, Tesla. Musk owns about 12% of Tesla's stock, and he serves as the CEO of the company.

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.

The Elon Musk-Sam Altman courtroom showdown already promised plenty of fireworks. And in its first week, dominated by the world's richest man taking the stand in a federal courthouse in Oakland, Calif.

The world's richest person is claiming that OpenAI's leaders betrayed the public by abandoning the nonprofit mission meant to benefit humanity.

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.