Simon Willison: Highlights from the Claude 4 system prompt. “Anthropic publish most of the system prompts for their chat models as part of their release notes. They recently shared the new prompts for both Claude Opus 4 and Claude Sonnet 4. I enjoyed digging through the prompts, since they act as a sort of unofficial manual for how best to use these tools. Here are my highlights, including a […]
https://rbfirehose.com/2025/06/07/simon-willison-highlights-from-the-claude-4-system-prompt/
