Oddbean new post about login | logout Which devices have kernel 6.1?
None at the moment. It is a generic image used in emulator builds since December and is made to prepare for when Tensor Pixels move to Kernel 6.1 proper.
Which devices are upgradable to kernel 6.1?
All Tensor Pixels (Pixel 6 and later) are rumored for the upgrade, by the time this will happen it's possible only the Tensor Pixels will be fully supported by GrapheneOS as devices older will be end-of-life.