Persimmon Was Mid- and Post-Trained From NVIDIA's 550B Nemotron 3 Ultra on Blackwell GPUs
niloofar_mire · x · 2026-09-11
humans& shared training details for its Persimmon user model: it was mid- and post-trained from NVIDIA's 550B-parameter Nemotron 3 Ultra using thousands of Blackwell-generation GPUs on the startup's own cluster. The team calls it an early release, with tool use and longer-horizon simulation still ahead.
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