According to the developer, Mundfish, Atomic Heart will run at 4K/60fps on both Xbox Series X and PS5, with some potential slight dips in the open world.
The resolution and frame rate will remain solid throughout dungeons. While many take 60fps for granted, especially at 4K, a lot of modern games have taken the hit to go down to 30 frames-per-second, such as Gotham Knights and A Plague Tale: Requiem.
<social>https://twitter.com/mundfish/status/1614911393060339712</social>
There's also going to be "mind-blowing" optimisation for previous-gen consoles. While this doesn't mean that we're going to get the same frame rates and resolution as current-gen machines, it's still a positive sign for a game that could have easily focused just on the newer tech.
Atomic Heart releases on the 21st of February, 2023.