[sam_bristow]

I believe newer ESP32 chips are based on the Risc-V microarchitecture.

[crote]

Yup. The original ES32, ESP32-S2, and ESP32-S3 use Xtensa, but the ESP32-C2, -C3, -C6, and -H2 use RISC-V.

Unfortunately they don't all have the same feature set, so you'll often still see the Xtensa variants in the wild as they are are simply a better product overall.

[MrBuddyCasino]

The C6 is pretty much a superset of the features of the old Xtensa based models.

[tbyehl]

All the Espressif RISC-V chips so far are missing the USG-OTG feature of the S2/S3 and RP2040.