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Musk Acknowledges xAI Used OpenAI Outputs to Train Grok in Federal Testimony

The admission sharpens legal scrutiny of distillation practices that may violate company terms.

Overview

  • Musk, testifying Thursday in a California federal court, said xAI "partly" used OpenAI models to help train its Grok system.
  • Distillation uses answers from a large "teacher" model to teach a smaller "student" model, which cuts computing costs while keeping much of the skill.
  • OpenAI’s terms forbid using its outputs to build competing models, though reporters note the legality of distillation remains unsettled.
  • Frontier labs have tried to block mass-query distillation, with OpenAI and Anthropic naming Chinese firms and Anthropic cutting off coding access to rivals including xAI.
  • OpenAI did not comment at press time, with the Oakland trial over Musk’s claim OpenAI abandoned its nonprofit mission now putting safety and competition in the spotlight.