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Musk posted on X, disclosing major progress in Grok's new-generation AI training and inference infrastructure and stating that engineering expertise from Starlink will support Grok's iteration. The SpaceX AI team rewrote Grok's reinforcement learning and inference software from scratch, replacing JAX and SGLang with a self-developed system developed primarily in C with a small amount of C++. This compute stack was implemented by the engineering team that built Starlink's complex satellite network. Musk stated that SpaceX independently wrote the header files and independently calculated time, including leap seconds; industry professionals understand the value of this underlying capability, which is the core foundation of Grok's new AI stack.
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