It runs on Arc, which itself is implemented with SBCL.
It switched from Racket in late 2024. Context and discussion: https://news.ycombinator.com/item?id=44099006 (9 months ago, 435 comments)
alt Hacker News
It switched from Racket in late 2024. Context and discussion: https://news.ycombinator.com/item?id=44099006 (9 months ago, 435 comments)