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Anthropic publishes Claude's system prompt. The captured version is 13 times longer.

This story is from 2026-09-17. It is preserved in the archive; the latest stories are on the live feed.

Every AI product reads a block of instructions before it ever sees your message. Who it is, what it refuses, how it formats answers, what it must never say. You do not write it and you are not shown it. One repo has captured 430 of them , organised by vendor. The leak angle is the boring part. Here…

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  1. 2026-09-17 07:48 · DEV Community — AI
    Anthropic publishes Claude's system prompt. The captured version is 13 times longer.

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