https://www.gamespot.com/articles/e3-2018-anthem-is-always-online-bioware-confirms/1100-6459561/

BioWare's Anthem is always online. Developer Mark Darrah confirmed to GameSpot that you'll need a persistent internet connection to play its upcoming cooperative shooter, whether you're adventuring solo or with other players.

This is similar to the approach taken by Destiny, to which Anthem has drawn many comparisons since it was first unveiled at last year's E3. Activision's online shooter likewise places a heavy emphasis on cooperative play and requires a persistent internet connection, regardless of whether or not you're teaming with other players.