Can PS4 and PS5 play together?
Cross-generation multiplayer
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 in supported games.
Can I play a PS5 game on a PS4?
Sadly, not really. Okay, so the short answer on this topic is, technically no, you can't play PS5 games on your PS4. Upcoming PS5 games that have been confirmed as PS5 exclusives - including the likes of God War: Ragnarok - will not be playable on PS4 whatsoever.
Can you play your PS4 through your PS5?
The app searches for the PS4 console that you set up in Set up your PS4 console, and then connects. After it connects, the screen of your PS4 console displays on your PS5 console and you can start using Remote Play. Before using Remote Play from outside your home, we recommend that you check your connection.
Will PS5 disc work on PS4?
Unlike the Xbox Smart Delivery program on Xbox Series X and Xbox Series S, Sony doesn't support forward compatibility, so you can't simply take your PS5 game and play it on a PS4.