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

Simon Willison's Weblog · April 18, 2026

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

AI Summary

  • •System prompt changes between Claude Opus 4.6 and 4.7 were documented and analyzed
  • •The modifications reflect Anthropic's iterative approach to refining AI behavior and capabilities
  • •Specific differences in instructions likely impact how Claude responds to user queries
  • •Such updates demonstrate ongoing efforts to improve AI assistant consistency and performance
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