Post
Simon Willison
simonwillison.net
did:plc:kft6lu4trxowqmter2b6vg6z
I used this as an excuse to do some reverse engineering of ChatGPT itself - the resulting running map was presented to me using this "visualize" skill, as a fragment of HTML that used D3 to draw both the map and the overlaid route https://codex-tool-reference.simonw.chatgpt.site/skills/visualize
2026-09-13T00:20:48.664Z