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Real, published system prompts from shipping AI products — each with source attribution and notes on what makes it work.

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Claude (claude.ai)

system prompt

Claude Sonnet 4.6 — Consumer System Prompt (claude.ai)

The consumer-facing claude.ai system prompt for Claude Sonnet 4.6 (dated March 2026). It is a large, sectioned prompt covering product info, refusal h…

role definition constraint setting refusal policy

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