Players of Fallout 4 on PC have already beaten Grand Theft Auto 5 for peak concurrent users. Fallout 4 has, at the time of this writing, over 400,000 concurrent users, putting it behind only Counter-Strike: Global Offensive and Dota 2 for the Steam all-time concurrent user record.
Stat tracking site steamcharts.com, which uses Valve's openly-available Web APIs for collection of data, has Fallout 4 listed at nearly 4.5 million hours played thus far. While that doesn't put it in the top 10 for total hours played, it is a massive achievement for a game that most players only just began today.
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