Musk says the Grok training stack is mostly C with a little C++

elonmusk · x · 2026-11-10

Asked about the language behind the SpaceX/Grok training and inference stack, Elon Musk replied that it is "C with a little C++, but not too much" — a terse follow-up to his longer post about the SpaceX-built stack.

Related event: Musk: Grok 4.8 Ditches JAX/SGLang for a C/C++ Rewrite of Its Training and Inference Stack(6 posts)→

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