"TPUs" are a Google-only product, available* only on GCP.

* Notwithstanding the Choral boards

We started on V3s, now fully moved to V4s with some V5Es, investigating a full move towards V5E & V5P

We use v4s, v5es & v5ps. Mostly v5ps, very stable int8 training (versus the horror that is fp8 stability)