* [Highlights from the Claude 4 system prompt](https://simonwillison.net/2025/May/25/claude-4-system-prompt/) by [Simon_Willison], ^[HN](https://news.ycombinator.com/item?id=44101833)^
* above text also contains a link to [Considerations in constructing Claude’s character](https://www.anthropic.com/research/claude-character#considerations-in-constructing-claudes-character).