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A preference-comparator rig in a bright alignment lab, two printed response transcripts feeding into a viewing gate as a spring-loaded selector flag is caught mid-flip toward one side, a lectern holding an open constitution soft-focus behind it

How Constitutional AI Actually Constrains a Model's Behavior

Constitutional AI keeps RLHF's reward-model-and-reinforcement-learning core intact and swaps the source of one training dataset, a document standing in for a person's judgment. That swap is narrower, and its limits more specific, than the name suggests.

By Brecht Corbeel · August 11, 2026 · 16 min read

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