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arXiv · 2601.14290

Project Aletheia: Verifier-Guided Distillation of Backtracking for Small Language Models

Aradhya Dixit·Tianxi Liang·Jai Telang
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Abstract

Small Language Models (SLMs, under 10B parameters) are attractive for private, on-device deployment, yet they frequently fail on strict constraint-satisfaction problems due to linear, overconfident reasoning traces that do not recover from early mistakes. We introduce Verifier-Guided Distillation, a training protocol that transfers the process of error repair - explicit conflict detection and backtracking - rather than only correct final answers. By training a 7B model on verified reasoning traces that include mistakes and self-corrections, we show that latent verification behavior can emerge in small models, enabling them to occasionally stop, detect contradictions, and revise earlier assumptions.

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Aradhya Dixit, Tianxi Liang, Jai Telang. 2026-01-14. Project Aletheia: Verifier-Guided Distillation of Backtracking for Small Language Models. https://arxiv.org/abs/2601.14290

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