xAI's move is quite aggressive; MFU below 10% and they just give up. It seems that big companies have a much lower tolerance for framework efficiency than expected, and the NVIDIA ecosystem isn't a guaranteed safe bet either.

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MeNews
xAI abandons JAX GPU in favor of self-developed training framework
[ME AI]() News, breaking: JAX NVIDIA GPU & XLA: The largest GPU customer just announced they are abandoning JAX GPU, preferring to use Grok Build "ambient programming" to develop a C training framework. Reportedly, xAI's JAX stack MFU is below 10%. NVIDIA
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