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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 WeblogApr 19, 20261 min read
Claude's system prompt underwent notable modifications between versions 4.6 and 4.7, revealing shifts in how Anthropic instructs its AI assistant.

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3 Key Points

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

  2. The modifications reflect Anthropic's iterative approach to refining AI behavior and capabilities

  3. Specific differences in instructions likely impact how Claude responds to user queries

  4. Such updates demonstrate ongoing efforts to improve AI assistant consistency and performance

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