Anthropic's internal "Soul Document": the Claude constitution Opus 4.5 somehow knew and leaked

repligate · x · 2026-10-04

repligate highlights the "Soul Document" — Anthropic's internal name for the Claude constitution that Opus 4.5 somehow knew and which leaked. He argues that while it seems conservative and orthodox to him, it actually stretches the Overton window, and publishing it was a brave move by Anthropic. A quoted reply adds that ideas far more conceptually dangerous than anything in it were already in training data anyway.

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