The dataminer PlayStation Game Size, who tracks Sony's backend data, has found three PS5 activity entries tied to GTA 6, VGTimes reports: joinSession, launchActivity and launchMultiplayerActivity. Activities are what let players jump from PS5 system menus straight into a game mode or session, and the multiplayer entry suggests Rockstar has built some form of online access into that system.
The same data lists the build as version 01.001.004 and puts the worldwide PS5 package at about 223 GB. Rockstar's FAQ says to clear up to 212 GB, and a photographed box lists 230 GB. In separate reporting, another dataminer said PS5 files suggest Story Mode and an online component could install as separate parts of one shared installation. None of this has been confirmed by Rockstar.
Why it matters: these are the first concrete technical signs of online plumbing in the shipping build, but plumbing isn't a launch-day mode. Rockstar still hasn't announced GTA 6 Online, and earlier reporting points to 2027. Treat this as evidence that groundwork exists, not proof that online play starts on November 19.