Claude 4 can apparently follow a 60,000-character system prompt

1 month ago 10
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May 25, 2025May 25, 2025

Matthias is the co-founder and publisher of THE DECODER, exploring how AI is fundamentally changing the relationship between humans and computers.

The full system prompt for Claude 4 has been leaked by X user "Pliny the Liberator" and is now available on GitHub. The document, over 60,000 characters long, sets detailed rules for tone, roles, source handling, and banned content. It controls the model at the system level, before any user prompt is processed. I find it strange that large language models often fail to follow short user instructions, yet seem able to follow complex internal prompts like this one. If you know the reason for that, shoot me an email.

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Matthias is the co-founder and publisher of THE DECODER, exploring how AI is fundamentally changing the relationship between humans and computers.

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