Policy & Ethicsmodel constitutionalignmentanthropictransparency
Anthropic Releases Claude Constitution Under CC0
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10.0
Anthropic today published the full 'constitution' used in training its Claude Opus 4.5 model, releasing the 35,000-token document under a CC0 license. The constitution — first exposed late last year after researcher Richard Weiss extracted a baked-in document and confirmed by Anthropic staff — details Claude's core values and includes external acknowledgements, including two Catholic clergy reviewers. The release enables public scrutiny and reuse.
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Official CC0 release enables full scrutiny and reuse; provides authoritative, industry-wide transparency into model alignment and safety practices.
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