https://www.playstation.com/en-us/ps5/ps5-features/
Game creators now have the option to enable online multiplayer game matches between PS5 and PS4 players.* PS4 players can be seamlessly invited to play with PS5 players, and vice versa.
Whether your friends are on PS4 or PS5, cross-generation voice chat means everyone can keep the conversation going with their account for PlayStation™Network. You can even chat with players on mobile devices who have PlayStation App.
*Multiplayer games require an active PlayStation®Plus subscription. PS Plus is a paid-for ongoing subscription and a recurring fee will be charged automatically at the frequency chosen by the consumer at purchase until cancelled.
