✍️ Simon Willison 2d ago
Changes in the system prompt between Claude Opus 4.6 and 4.7
Analysis of Claude Opus 4.7's system prompt changes reveals expanded child safety instructions, anti-verbosity guidance, new "acting vs clarifying" rules to reduce unnecessary questions, and defenses against screenshot-based prompt injection. Anthropic's transparency in publishing prompts enables tracking how system-level engineering evolves alongside model capabilities.