ArchiNode

How do I raise the resolution of a render?

With the Image Upscaler: it raises the resolution 2x or 4x and adds detail. Connect the image, pick the mode and the scale, and run it; “Compare” shows you the before and after. It's available from Standard.

ModeWhat it's for2x (tokens)4x (tokens)
PrecisionFaithful to the original, designed for architecture (the default mode). It has fine controls for creativity, resemblance and prompt, which don't change the price.4590
CreativeInvents detail and can alter the geometry; the app warns you. It has the same fine controls.4590
TextureReinterprets nothing: it takes care of material and edges. It's the cheapest.2550

It's also the “Upscale” tab of the image editor, and a standalone app, the Upscaler, in the “Apps” panel of the Dashboard.

Enhance, upscale and edit