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Claude's updated system prompt in Fable 5.1 introduces stricter | Tech Twitter

Claude's updated system prompt in Fable 5.1 introduces stricter

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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 https://simonwillison.net/2026/Sep/2/cla…

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