Pytorch now has native support for the Blackwell architecture:

https://pytorch.org/blog/pytorch-2-7/

It does, but the performance is pretty bad, worse than Hopper.

Curious what issues you were having. The kernel should compile natively if you pass nvcc the correct arch flags, although it probably won't take advantage of any new hardware features.

High-performance GPU code typically uses nonportable features that are not supported across generations.