Cyberpunk 2077 has blown away the previous record for simultaneous players in a single player game on Steam (and for concurrent viewers on Twitch, too).

As PC Gamer points out, that previous record was Fallout 4 with 472,962 concurrent players, which Cyberpunk 2077 easily exceeded after its launch, going on to break the million mark.

Peak players reached 1,003,264 to be precise, although that’s not quite up there with the big multiplayer games of course – Dota 2 for example has recorded 1,295,114 concurrent gamers before, and the record is held by PUBG with a staggering 3,257,248 people enjoying the battle royale at the same time.
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https://www.techradar.com/news/cyberpunk-2077-blows-away-steam-record-as-tons-of-gamers-rush-to-play-at-launch