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Elon Musk Admits in Court That xAI Trained Grok Using OpenAI Models

Elon Musk Admits in Court That xAI Trained Grok Using OpenAI Models INTRO: In a stunning courtroom revelation during the ongoing Musk v. Altman trial, Elon Musk testified that his AI company xAI used OpenAI's models to train Grok, its competing large language model. The admission came as part of the high-stakes legal battle between Musk and OpenAI, with the Tesla and SpaceX CEO acknowledging the irony while positioning xAI as the smallest major player in the AI race behind Anthropic, OpenAI, Google, and Chinese AI companies. KEY HIGHLIGHTS: - Musk confirmed xAI trained Grok on OpenAI models during court testimony - Admission made during Musk v. Altman trial over OpenAI's direction and mission - Musk described xAI as smallest of major AI players, trailing competitors - Testimony revealed early OpenAI tensions dating back to 2015 emails - Evidence showed Musk lost confidence OpenAI could compete with Google/DeepMind WHAT HAPPENED: During cross-examination in the lawsuit he filed against OpenAI, Elon Musk acknowledged that xAI, his separate AI company, trained its Grok language model using OpenAI's models. The testimony came as part of a broader examination of Musk's relationship with OpenAI and his motivations for the lawsuit. Court documents and email evidence revealed tensions dating to OpenAI's early days, including Musk's 2018 email stating he "lost confidence that OpenAI could muster the resources to serve as an effective counterweight to Google/DeepMind" and decided to pursue AI development through Tesla instead. WHY IT MATTERS: The admission carries significant irony given Musk's lawsuit accuses OpenAI of abandoning its original nonprofit mission, while simultaneously using the company's technology to fuel a competing venture. The testimony provides insight into the complex relationships and competing interests in the AI industry's upper echelons. It also highlights the challenges of maintaining proprietary advantages in AI development when key players have overlapping interests and access to each other's technology. The case outcome could influence how AI companies protect their research and manage relationships with former collaborators. WHAT'S NEXT: The trial continues with additional testimony expected from key figures in the AI industry. Court documents suggest more revelations about early AI industry dynamics and the evolution of major players' strategies. The case may influence how AI companies structure collaborations and protect intellectual property. Industry observers are watching for potential implications on AI governance, competition, and the balance between open research and commercial interests. SOURCE: https://techcrunch.com/2026/04/30/elon-musk-testifies-that-xai-trained-grok-on-openai-models/

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