Due to differences in the versions, it's not possible to play GTA Online on PS5 with players on PS4, unless you're still running the PS4 version on your PS5.

Grand Theft Auto GTA 6's server player count rumour could be great news for GTA Online 2.0 Grand Theft Auto GTA 6: What we know about Rockstar's return to Vice City Grand Theft Auto GTA Online ...

GTA V and Homelander from The Boys make the perfect match, as demonstrated in this slick mod that lets you wreck Los Santos as the world’s smarmiest superhero ...