Why Persimmon builds human-behavior models on NVIDIA Nemotron 3 Ultra base instead of an aligned assistant
CShorten30 · x · 2026-09-24
The Weaviate podcast hosts the Persimmon team (Alexis, Manya, Niloofar) explaining why they build human-behavior models from the NVIDIA Nemotron 3 Ultra base model rather than a polished assistant.
Post-training causes mode collapse, stripping out the behavioral variation their task needs to model; the choice followed internal evaluations, not a default preference for the largest model.
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