Apolo

Elon Musk just revealed something huge about Grok's new SI training and inference infrastructure The engineering behind Starlink is now helping power the development of Grok SpaceXSI has completely rewritten Grok's reinforcement learning and inference software from scratch, replacing JAX and SGLang with its own system built primarily in C, with a little C++ And the most important part is where this engineering expertise comes from The new stack is built on the incredible work of the engineers who created Starlink's incredibly complex satellite network Elon explained: "At SpaceX, we write our own headers and calculate our own time (includes leap seconds). Not many people will know what this means, but those that do will appreciate it." Here's why that's significant SpaceX engineers build and control critical parts of their software themselves, even down to the code interfaces and precise time calculations needed for satellite operations This gives them much tighter control over how their systems operate, reducing unnecessary software dependencies and allowing them to optimize performance and reliability Now that same engineering philosophy is being applied to Grok