It seems that OpenBSD 7.6-current (snapshots) amd64 is installable on our new Lenovo X1 Carbon gen 12.
Suspend/resume works, audio works, graphics are incredible (120Hz) with OpenGL 4.6 running fully accelerated by Intel graphics (firmware needed).
What does not work out of the box is wifi. The laptop supports the latest wifi protocols and OpenBSD is stuck at WEP by looking at various mailing list posts on tech@openbsd.org, no WPA/WPA2 for now.