That entirely depends on the game. Some games, like Terraria, can connect to the same servers regardless of whether it was bough on Steam or GOG. Others could rely on Steam's API for matchmaking and online play on the Steam version, and will likely be incompatible with GOG versions. And then there are games that may not be designed for online play, but still can be played online using methods like Steam Remote Play.
this post was submitted on 23 Dec 2023
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If I see on the store page that the game has Steam API, just forget about getting the GOG version because I won’t be able to play with the steam players?
There's unfortunately no rule or easy way to tell other than doing your own investigation for each individual game.
Depends entirely on the game. Some games yes some games no.
But how do you know?
Mostly you have to look it up on a per game basis. Probably just Google the game name and "supports cross play between" whatever platforms you want and someone will know