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Elon Musk Admits xAI Used OpenAI Technology To Train Its ...

Musk said xAI partly used OpenAI models to train Grok, a practice he described as common among AI companies.

  • On Thursday, Elon Musk admitted in California federal court that xAI "partly" used distillation techniques on OpenAI models to train Grok, despite OpenAI's prohibition against the practice.
  • The testimony occurred during Musk's trial against OpenAI CEO Sam Altman and Greg Brockman, where Musk alleges they breached the startup's original non-profit mission by pivoting to a for-profit structure.
  • Distillation involves systematically querying models to understand inner workings, a practice frontier labs like OpenAI, Anthropic, and Google actively block through the Frontier Model Forum to protect competitive advantages.
  • Musk's admission reveals competitive pressure in the AI industry, where firms often use third-party APIs for distillation despite major labs' active efforts to prevent such practices.
  • The trial, which could force a reversal of OpenAI's for-profit conversion and delay an IPO potentially valued at up to $1 trillion, continues with Microsoft Corp. facing liability through its $13 billion investment.
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Lean Right

The former partners Elon Musk and Sam Altman have become fierce rivals and competitors. With a lawsuit, Musk wants to force Altman to resign as OpenAI chief. However, in court, Musk must first make an admission that he would have preferred to avoid.

Lean Right

In AI training, there is the method of using a model as a teacher that learns new software like a student. Elon Musk had to say under oath whether he was using AI from the rival OpenAI.

·Düsseldorf, Germany
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Forbes broke the news in United States on Thursday, April 30, 2026.
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