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    Simon Willison (simon@fedi.simonwillison.net)'s status on Thursday, 22-Jan-2026 09:11:37 JSTSimon WillisonSimon Willison

    A few quick notes on the Claude "soul document" that was released by Anthropic today under a CC0 public domain license - it's a huge 35,000 token essay used as part of Claude's training to instill core values and help define Claude's personality https://simonwillison.net/2026/Jan/21/claudes-new-constitution/

    In conversationabout 3 months ago from fedi.simonwillison.netpermalink

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      Claude’s new constitution
      from @simonw
      Late last year Richard Weiss found something interesting while poking around with the just-released Claude Opus 4.5: he was able to talk the model into regurgitating a document which was …
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