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Since Anthropic publish their system prompts we can generate a diff between Claude Opus 4.6 and 4.7 - here are my notes on what's changed simonwillison.net/2026/Apr/18/...

simonwillison.netChanges in the system prompt between Claude Opus 4.6 and 4.7Anthropic are the only major AI lab to publish the system prompts for their user-facing chat systems. Their system prompt archive now dates all the way back to Claude 3 …

Shawn Simister

@narphorium.com

So you’re saying I can go back through all my prompts and remove all the “NO EMOJI” lines?

19/4/26, 12:25 am0 reposts3 likes

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