zclaw claims a personal AI assistant that runs on ESP32 with an on-device footprint under 888 KB.
A Hacker News post title claims Raspberry Pi Pico 2 can operate at 873.5MHz with a 3.05V core, i.e., extreme overclocking/voltage.
Xcc700 is a self-hosting mini C compiler for ESP32 (Xtensa) announced as a 700-line project.