It was natively trained in FP4. Probably both to reduce VRAM usage at inference time (fits on a single H100), and to allow better utilization of B200s (which are especially fast for FP4).

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irthomasthomas 7 days ago | parent [-]

Interesting, thanks. I didn't know you could even train at FP4 on H100s

	▲	reissbaker 5 days ago \| parent [-]
		It's impressive they got it to work — the lowest I'd heard of this far was native FP8 training.