With the latest updates (May 2019), Gigapixel AI, Sharpen AI and Denoise AI all can now output ZIP compressed TIF/TIFF files which is certainly a step forward.
Gigapixel AI and Sharpen AI can be set to output 8 or 16 bit versions, but sadly Denoise AI has a bug that prevents the selection of 8 bit, so it can only output ZIP compressed TIF/TIFF files as 16 bit.
One tends to consider these AI programs as somewhat of a family, but at the moment it seems to be a family with communication problems. Gigapixel AI can input its own ZIP compressed TIF/TIFF output files, and also those produced by Sharpen AI and Denoise AI.
Sharpen AI however can’t input ZIP compressed TIF/TIFF files produced either by itself, or by Gigapixel AI or Denoise AI, and similarly Denoise AI can’t input ZIP compressed TIF/TIFF files produced by itself or by Gigapixel AI or Sharpen AI.
Fortunately they can be opened in Studio.