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Claude Fable 5 System Prompt Leak Shakes AI Industry

Marko Nguyen

19 June 2026

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Claude Fable 5 System Prompt Leak Shakes AI Industry

Marko Nguyen

19 June 2026

mins read

Add on google

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The Claude Fable 5 system prompt leak revealed hidden safety rules, shared architecture with Mythos 5, and performance restrictions for suspected AI competitors before the model was shut down days later.

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Claude Fable 5’s full system prompt leaked within 24 hours of launch, exposing 120,000 characters across 1,585 lines

The leak suggests Fable 5 and Mythos 5 use the same base model with different safety filters

A hidden “silent degradation” rule weakened outputs for suspected AI competitors

A June 12 export control order forced Anthropic to disable both models globally

Developers later recreated Fable 5-like behavior on Opus 4.8 using the leaked prompt

Anthropic launched

Claude Fable 5

on June 9, 2026, calling it the most capable AI model ever made publicly available. Within 24 hours, its entire system prompt was posted on GitHub for anyone to read.

The leak, published by a well-known AI researcher operating under the name Pliny the Liberator, exposed

120,000 characters of internal instructions

spanning 1,585 lines and more than 27,000 tokens. It was uploaded to the CL4R1T4S repository on GitHub, the same collection that has previously published extracted system prompts from ChatGPT, Gem

来源: Brave/memeburn.com

采集时间: 2026-06-19 20:16:53