Thief outputs at a native 1080p resolution on PlayStation 4 and a native 900p resolution on Xbox One, Square Enix has confirmed to Eurogamer.
Both versions run at 30 frames per second.
The difference in resolution with Thief isn't quite as stark as it is with Call of Duty and Metal Gear Solid. Thief's resolution on Xbox One mirror's that of Assassin's Creed 4 and Ryse, both of which output at 900p and 30fps on Xbox One.
"You really need good eyes to see the difference," game director Nicolas Cantin told Eurogamer of the resolution difference between PS4 and Xbox One, before insisting the Xbox One version "is as good as the PS4 version".
For Cantin, and others on the design team, the Xbox One version's resolution "doesn't make much of a difference".
"As developers, no," he continued. "As engineers, yeah. The engineers, for sure. But for us, as creative director or art director or level designer, we gave the same data. After that it's a more technological aspect of the game. The engineers have to manage that."
Eurogamer