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 trial comes at a pivotal moment for AI, a technology poised to bring advancement that could also drastically reshape 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.

The former OpenAI business partners are embroiled in a high-stakes dispute over the future of one of the world's top AI companies.