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Ran some drywall in a room on the ceiling and some of the joints have a gap about 1/4" wide (either at butts or one place by the wall, which may be closer to 3/8"). The gap at the wall was due to its angle and the other gaps at the butts were from slightly undercutting.

Is something that is still able to be finished?

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Those gaps are completely common and not an issue. Pros deal with far worse on almost any job, especially when another crew did the hanging.

You could pre-fill those gaps by skimming and let that dry (or use setting-type compound for a faster job). It'll shrink some, but it'll make the taping coat shrink a lot less. It's not necessary, though.

The fact is that these joints will be stronger than those with just surface finishes. The joint compound pushes through the gap and creates a shear bridge, locking the ends of the sheets together much more effectively than just a thin layer on the face would.

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    A good place to use hot mud, but avoid the super-short working time stuff as a DIY - 90 minutes is plenty fast .vs. drying compound that might take a day or more to dry throughly, and does not have the panic factor that 5 or 20 minute stuff does.
    – Ecnerwal
    Dec 7 '20 at 15:03
  • Looks like there is another gap along another wall I didn’t notice, it’s at an angle so one end measures 1/4” and the other at 1/2”, is 1/2” too much?
    – datta
    Dec 7 '20 at 16:20
  • Depends partly on whether it's totally hollow behind. You'll have to try and see how it goes. Shouldn't be a problem.
    – isherwood
    Dec 7 '20 at 16:26
  • It’s to the attic, so you can definitely see some spacing in there
    – datta
    Dec 7 '20 at 16:35
  • It’s actually not entirely void, that edge is screwed into a strapping I put around the perimeter of the room. However, strapping is a little bowed so it’s not flush with the wall. So if looking up into the 1/2” gap, I’d say 1/4” is strapping the other is just space.
    – datta
    Dec 7 '20 at 20:34

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