How large gap between drywall panels at an edge?

[a12345]

I'm putting up drywall and realized I cut one of the boards crooked so it's 1 cm shorter than it should be at the top, so when I place the board against the corner there's a gap of a little over a cm. Can this be fixed with spackle, etc., or should I just toss it?

 

[Anonymiserad 405730]

I'm in the process of putting up drywall and realize that I've cut one of the boards crooked, so it's 1 cm shorter than it should be at the top, resulting in a gap of about a centimeter when placed against the corner. Can this be fixed with filler, etc., or do I just have to throw it away?

Not regular filler but gypsum plaster or some other filler designed for rough filling.