Simon Willison • 4/19/2026

Changes in the system prompt between Claude Opus 4.6 and 4.7

This article examines the differences in system prompts between Anthropic's Claude Opus 4.6 (February 2026) and 4.7 (April 2026). Key changes include renaming the 'developer platform' to 'Claude Platform', adding new tools like Claude in PowerPoint, expanding child safety instructions with a critical tag, and making Claude less pushy about ending conversations. The new 'acting vs clarifying' section encourages Claude to use tools to resolve ambiguity rather than asking users upfront. The article also notes a new tool search mechanism for capabilities like location and calendar access.

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#AI Safety #GIT Diff #Claude Opus