RDLTR

Short for Read Later. Save links from any browser or phone. Click to save, read to clear. The full tour

One line. Many voicesSeek and you shall find

simonwillison.net faviconChanges in the system prompt between Claude Opus 4.6 and 4.7

kept by

Opus 4.7's system prompt adds child safety tags, a tool-search mechanism, anti-verbosity instructions, and drops the Trump presidency clarification from the 4.6 prompt.