Did I just unlock claude-fable-5-lite?

@aistartupfren

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Why it worked

The video leverages a trending technical 'hack' within the AI community, providing immediate, visual proof of a controversial claim that directly impacts user experience.

Summary

The creator discusses a viral experiment where users are applying a leaked system prompt to Claude Opus 4.8 to replicate the behavior of the discontinued Claude Fable 5 model. The video showcases side-by-side comparisons of the model's output quality when using the standard prompt versus the leaked Fable 5 prompt.

Structure

1Introduce the viral experiment to revive Claude Fable 5
2Explain the technical method using Claude Code and the leaked system prompt
3Show side-by-side comparisons of model outputs
4Demonstrate the difference in quality for web design and 3D modeling tasks

On-screen text

How to revive Fable 5 Did I just unlock claude-fable-5-lite? I dropped it into Claude Code using claude --dangerously-skip-permissions --system-prompt-file CLAUDE-FABLE-5.md Claude Fable 5 - System Prompt PEOPLE ARE RUNNING THE LEAKED FABLE 5 SYSTEM PROMPT ON OPUS 4.8 TO SEE HOW MUCH OF THE MAGIC CAME FROM THE PROMPT Opus 4.8 Fable 5 left: 4.8 right: 4.8 + Fable 5 prompt

Transcript

Did I just unlock claude-fable-5-lite? So, someone on X just revived Claude Fable 5 with a prompt. So, we figure out if you use this command in Claude Code, with this system prompt markdown file, which is a whole prompt to make it behave like Fable 5. Here's the comparison with Opus 4.8 and Opus 4.8 plus Fable 5 system prompt. This is the prompt of creating an Apple style website. This is the prompt of creating a plain 3D model.