VGTimes reports that photos, shared on Reddit and picked up by TwistedVoxel, appear to show a German PS5 box for GTA VI stating a minimum of 230 GB of free storage. Rockstar's preload FAQ says the download needs up to 212 GB depending on the device, so the box figure is roughly 18 GB higher.
The same report notes that Microsoft's database lists the Xbox Series X|S version at about 225 GB, while the Microsoft Store page shows roughly 210 GB. Journalists suggest the differences may come from decimal versus binary gigabyte counting and from extra space needed during installation, but that is a theory and nothing here has been confirmed by Rockstar. We are treating the box photos as unverified.
Why it matters: preloading starts soon and the base file is already enormous. Until Rockstar clarifies, plan for at least 230 GB of free space on PS5 and about 225 GB on Xbox so the install does not stall at launch.