Constitutional Midtraining: Content Presence Drives Alignment Gains
Post-training alignment is often shallow, eroding under fine-tuning. Whether midtraining interventions, cleanly isolated from post-training, can produce durable alignment remains untested. We test this via constitutional midtraining: inserting principled, values-based content into midtraining against a replay-only control at 120B scale. Our 394M-token constitutional corpus, built from Anthropic's Constitution, uses a 2x2 factorial design (curriculum ordering x deliberative reasoning) to produce
Record details
Published: 29 July 2026
Source: arXiv
Category: Research
Topics: Safety & alignment
Retrieved: 30 July 2026
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ethics.ai (29 July 2026), “Constitutional Midtraining: Content Presence Drives Alignment Gains,” evidence record 14581, https://ethics.ai/record/14581 (originally published by arXiv).
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