No extra head needed: Hugging Face scores decisions straight from base model logits

LysandreJik · x · 2026-10-12

Lysandre explains the design behind /v1/systemone: instead of training classification/reward/value heads on top of a model, they leverage existing architectures directly — softmax over candidate logits (e.g. billing 0.03 / technical 0.94 / sales 0.03). Caveat: outputs are uncalibrated, so logits aren't as interpretable as dedicated decision models.

Related event: Transformers' new /v1/systemone endpoint turns 250 LLMs into decision models without extra heads(6 posts)→

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