Simon Willison 12/2/2025

Claude 4.5 Opus' Soul Document

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A researcher extracted a 14,000-token internal document from Claude 4.5 Opus, which the AI called its 'soul overview.' Anthropic confirmed this 'soul doc' was used in training to instill the model's core values, self-knowledge, and safety principles. The article discusses the document's purpose and shares excerpts, including Anthropic's mission and its approach to building safe, beneficial AI.

Claude 4.5 Opus' Soul Document

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