New Glenn at least claims to eventually be able to put 45,000kg to LEO. Once in orbit, refueling or docking boost stages can come into play. With Vulcan, I have mainly heard of proposals involving modifying Orion to dock the service module in orbit after separate launches.

Supposedly, as of a week ago, LM sees at least some possible routes to having Orion without SLS to not outright give up on the idea, but doesn't have specifics for now: https://arstechnica.com/space/2025/10/once-unthinkable-nasa-...