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Simon Willison Emerging AI Innovations Apr 18

Changes in the system prompt between Claude Opus 4.6 and 4.7

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The article examines the evolution of Anthropic's system prompts by comparing the differences between Claude Opus 4.6 and 4.7. The author used Claude Code to reconstruct a Git history of these prompt changes to highlight specific updates in terminology and tool descriptions.

Why it matters Subtle shifts in system prompt architecture reveal how frontier labs fine-tune model identity and tool-use boundaries during rapid iteration cycles.
Read the original at Simon Willison

Entities mentioned

Anthropic

Tags

#anthropic #claude #system prompts #llm evolution

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