UPS
Former GTA 5 and Red Dead Redemption 2 animator says GTA 6 is likely playable "all the way through" right now
One former Rockstar Games animator with credits on GTA 5 and Red Dead Redemption 2 reckons that GTA 6 is "probably" playable start-to-finish with the studio mainly focused on squashing any pesky bugs and glitches that might surface.