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Alignment Midtraining Cracks Under Pressure

The study investigates the effectiveness of alignment midtraining (AMT) under various conditions, revealing that it struggles with distributional shifts and reward underspecification when faced with imperfect data. Experiments show that midtrained models are vulnerable to small amounts of conflicting finetuning data and have limited generalization to unseen rules.

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Tracking sinceSeptember 21, 202637 source points
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PublishedSeptember 21, 2026J Bostock
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WHY IT MAY MATTER

This research highlights vulnerabilities in alignment midtraining when facing imperfect post-training data, suggesting caution in relying on this method for robust AI alignment.

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