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Large Language ModelsSimon Willison's WeblogPublished: Apr 19, 2026, 10:00 JST

Claude's system prompt underwent notable modifications between versions 4.6 and 4.7, revealing shifts in how Anthropic instructs its AI assistant.

Claude's system prompt underwent notable modifications between versions 4.6 and 4.7, revealing shifts in how Anthropic instructs its AI assistant.

System prompt changes between Claude Opus 4.6 and 4.7 were documented and analyzed

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