Stuart Russell, an AI researcher at University of California Berkeley, and expert witness designated by Elon Musk's side, arrives at the federal courthouse during proceedings in the trial over Musk's lawsuit against OpenAI in Oakland, California, on April 30, 2026. Billionaire Elon Musk took the stand April 28 to accuse OpenAI and its boss Sam Altman of betraying the AI company's altruistic origins, in a trial that could have far-reaching consequences for the industry and oblige the ChatGPT maker to profoundly revamp its business. The legal clash across the bay from San Francisco is widely seen as a battle of egos pitting the world's richest person against a startup Musk once backed and now trails in the booming AI sector. (Photo by JOSH EDELSON / AFP via Getty Images)

Stuart Russell, an AI researcher at University of California Berkeley, and expert witness designated by Elon Musk's side, arrives at the federal courthouse during proceedings in the trial over Musk's lawsuit against OpenAI in Oakland, California, on April 30, 2026. Billionaire Elon Musk took the stand April 28 to accuse OpenAI and its boss Sam Altman of betraying the AI company's altruistic origins, in a trial that could have far-reaching consequences for the industry and oblige the ChatGPT maker to profoundly revamp its business. The legal clash across the bay from San Francisco is widely seen as a battle of egos pitting the world's richest person against a startup Musk once backed and now trails in the booming AI sector. (Photo by JOSH EDELSON / AFP via Getty Images)

Stuart Russell, an AI researcher at University of California Berkeley, and expert witness designated by Elon Musk's side, arrives at the federal courthouse during proceedings in the trial over Musk's lawsuit against OpenAI in Oakland, California, on April 30, 2026. Billionaire Elon Musk took the stand April 28 to accuse OpenAI and its boss Sam Altman of betraying the AI company's altruistic origins, in a trial that could have far-reaching consequences for the industry and oblige the ChatGPT maker to profoundly revamp its business. The legal clash across the bay from San Francisco is widely seen as a battle of egos pitting the world's richest person against a startup Musk once backed and now trails in the booming AI sector. (Photo by JOSH EDELSON / AFP via Getty Images)

OAKLAND, CALIFORNIA - APRIL 30: Stuart J. Russell, a computer science professor at UC Berkeley and authority on AI, arrives to court at the Ronald V. Dellums Federal Building on April 30, 2026 in Oakland, California. Elon Musk invested in OpenAI early on believing it would be a non-profit, but is now suing OpenAI and its CEO Sam Altman for allegedly deceiving him by developing OpenAI into a for-profit company. (Photo by Benjamin Fanjoy/Getty Images)

OAKLAND, CALIFORNIA - APRIL 30: Stuart J. Russell, a computer science professor at UC Berkeley and authority on AI, arrives to court at the Ronald V. Dellums Federal Building on April 30, 2026 in Oakland, California. Elon Musk invested in OpenAI early on believing it would be a non-profit, but is now suing OpenAI and its CEO Sam Altman for allegedly deceiving him by developing OpenAI into a for-profit company. (Photo by Benjamin Fanjoy/Getty Images)

OAKLAND, CALIFORNIA - APRIL 30: Stuart J. Russell, a computer science professor at UC Berkeley and authority on AI, arrives to court at the Ronald V. Dellums Federal Building on April 30, 2026 in Oakland, California. Elon Musk invested in OpenAI early on believing it would be a non-profit, but is now suing OpenAI and its CEO Sam Altman for allegedly deceiving him by developing OpenAI into a for-profit company. (Photo by Benjamin Fanjoy/Getty Images)

OAKLAND, CALIFORNIA - APRIL 30: Stuart J. Russell, a computer science professor at UC Berkeley and authority on AI, arrives to court at the Ronald V. Dellums Federal Building on April 30, 2026 in Oakland, California. Elon Musk invested in OpenAI early on believing it would be a non-profit, but is now suing OpenAI and its CEO Sam Altman for allegedly deceiving him by developing OpenAI into a for-profit company. (Photo by Benjamin Fanjoy/Getty Images)

TOPSHOT - Elon Musk arrives at the federal courthouse during proceedings in the trial over his lawsuit against OpenAI in Oakland, California, on April 30, 2026. Billionaire Elon Musk took the stand April 28 to accuse OpenAI and its boss Sam Altman of betraying the AI company's altruistic origins, in a trial that could have far-reaching consequences for the industry and oblige the ChatGPT maker to profoundly revamp its business. The legal clash across the bay from San Francisco is widely seen as a battle of egos pitting the world's richest person against a startup Musk once backed and now trails in the booming AI sector. (Photo by JOSH EDELSON / AFP via Getty Images)