What exactly comes in the Ultimate Edition?

The full game plus the Ultimate Upgrade: the '95 Grotti Cheetah and '67 Vapid Dominator Buggy, the Ganado Retro Build pickup, the Dinka Enduro bike, the Crest kayak and the Shitzu Squalo boat; the Hawk & Little Morgan revolvers and custom versions of Jason's (Girardi ES9) and Lucia's (Klose K17) pistols; Vice City Style and Goodtime Gear outfits and tattoos plus the Electric Fang studio (50+ tattoos by the FAILE collective); the Rideout Customs, Sara's Unisex Salon, Stock 305 and One-Eyed Willie's businesses; the PTT Youngin$ mission and the Classic Car Collection job for the collector Wyman.

Checked by the GTA 6 Guide against Rockstar, Take-Two, official stores and the press. Sources for each fact are on the credits page.