Pinocchio: a lightweight model that adds calibrated confidence to frontier LLM outputs

micahgoldblum · x · 2026-10-02

Frontier LLMs like Claude ship without uncertainty estimates, and their verbalized confidence is poorly calibrated. Researchers trained Pinocchio, a lightweight model that assigns confidence scores to outputs of popular API models, making well-calibrated uncertainty estimation fast and easy.

Related event: Pinocchio: open-source 0.8B model adds calibrated confidence to black-box LLM APIs(3 posts)→

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