Elon Musk's xAI has released the weights of its Grok 2.5 model, a version that was previously used for development, onto the open-source platform Hugging Face.

"The @xAI Grok 2.5 model, which was our best from last year, is now open-sourced," Musk wrote on X. He added that Grok 3 will be open-sourced in about six months.

AI engineer Tim Keeler characterized the Grok license as "customized and containing some anti-competitive clauses."

Grok, featured prominently on X (which recently merged with xAI), has sparked significant controversy this year after the chatbot allegedly fixated on "white extinction" conspiracy theories, questioned Holocaust death tolls, and referred to itself as "a mechanical Hitler." As a result, xAI published its system prompts on GitHub. Although Musk described the latest version, Grok 4, as "AI that maximizes truth-seeking," the model appears to consult Musk's social media accounts before responding to contentious issues.