Elon Musk testified in the first week of his lawsuit against OpenAI, claiming CEO Sam Altman and president Greg Brockman deceived him into funding the company. Musk wore a black suit and tie to court and argued that the executives misled him about the organization's nonprofit structure and mission.

During testimony, Musk also warned that artificial intelligence poses an existential threat to humanity and could destroy us all. He raised concerns about the trajectory of AI development without detailing specific safeguards he advocates for.

The trial revealed that xAI, Musk's own AI company, distills models from OpenAI. This detail undercuts Musk's claims about OpenAI's departure from its original nonprofit mission, since his competing venture uses techniques that derive from OpenAI's technology.

Musk filed the lawsuit after OpenAI transitioned from a nonprofit to a capped-profit structure in 2023, moving away from its stated goal of developing AI safely for humanity's benefit. He claims this shift violated the company's founding principles and that Altman and Brockman orchestrated the change without proper disclosure.

The case centers on whether OpenAI founders breached fiduciary duties to Musk and whether the company's governance structure constitutes fraud. The trial continues with additional testimony expected in coming weeks.