Is GTA 6 a 677 GB download?
No.
Viral claim: “GTA 6 is a 677 GB download” False
No. The 677 GB number comes from an edited screenshot made to look like an Xbox store listing. It came from a parody account and even said "Install on your home Xbox One". GTA 6 isn't on Xbox One. Insider Gaming traced it back to the edited image.
The real number came from Rockstar in November: the pre-load needs up to 212 GB, depending on your console. That's still more than GTA 5 (87 GB on PS5) and Red Dead 2 put together. Pre-load times and storage.
Why 677 scared people: an original PS5 has about 667 GB you can actually use, so it would have been bigger than the whole drive.

Watch us check it
Sources
Until launch this comes from pre-release previews and interviews. We re-check every verdict against the real game after November 19 and note any change here.