Elon Musk testifies in OpenAI trial against fellow billionaire Sam Altman

Elon Musk testified in court that OpenAI's Sam Altman betrayed the organization's principles.

OAKLAND, Calif. — One of the biggest trials in tech is underway, and it did not take long for the accusations to start flying.

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Tech mogul Elon Musk took the stand Tuesday in the first day of testimony for his lawsuit against OpenAI CEO Sam Altman, claiming Altman, his onetime associate, had betrayed the altruistic principles the AI company they co-founded was built on.

Musk also took much of the credit for OpenAI's creation.