By Mike Swift ( April 28, 2026, 23:30 GMT | Insight) -- Elon Musk took the witness stand as the first witness in his trial against OpenAI alongside Microsoft and OpenAI executives Sam Altman and Greg Brockman as the high-profile trial kicked off with an extraordinary day of testimony in Oakland, California. With multiple billionaires in a thronged courtroom, the jurors heard Musk testify that he was the brains and ethical force behind the founding of OpenAI, with the future of humanity potentially at stake over the safe development of generative artificial intelligence. Meanwhile, US District Judge Yvonne Gonzalez Rogers confronted Musk and Altman about their volatile social media posts about the case, extracting a promise for them to stop attacking each other on social media.A lawyer for Elon Musk portrayed the tech billionaire Tuesday as the brains and ethical force behind the launch of OpenAI, only to see his ideals of developing AI for the good of humanity “stolen” by cofounders Sam Altman and Greg Brockman, with help from Microsoft....
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