Fable 5.1 System Prompt Changes
I wrote some notes on what's new in the (published) Fable 5.1 system prompt in comparison to Fable 5...
Fable 5.1 addresses copyright concerns that affect developers and users across ASEAN who create content with AI models.
Fable 5.1 introduces new guidelines on not reproducing song lyrics and avoiding drawing copyrighted characters. The updated system prompt builds upon Fable 5 with these specific content restrictions. Simon Willison published detailed notes comparing the two versions on 2 Sep 2026. The changes focus on preventing copyright infringement in AI outputs.
I wrote some notes on what's new in the (published) Fable 5.1 system prompt in comparison to Fable 5...
I wrote some notes on what's new in the (published) Fable 5.1 system prompt in comparison to Fable 5 - it's mostly about not reproducing song lyrics and avoiding drawing copyrighted characters simonwillison.net/2026/Sep/2/cla… 💬 15 🔄 3 ❤️ 51 👀 8374 📊 22 ⚡
