TLDR AI · ENGINEERING & RESEARCH

FABLE-5 SYSTEM PROMPT LEAK

2026-06-11links.tldrnewsletter.com27 min read

Summary from the TLDR AI newsletter

The system prompt for Anthropic's Fable 5 model has been leaked. It comes to a total of around 120,000 characters. The entire leaked prompt is available in the thread.

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