It's now possible to play Steam Deck Xbox games, thanks to Microsoft. For anyone with an Xbox Game Ultimate subscription – which Halo Infinite and Halo 5 now run on Valve's console.
Despite a massive amount of games Halo Infinite and Gears 5 are not among them. While the Steam versions of these games still don't work on Valve's console, there is a workaround for anyone with Xbox Game Ultimate.
Furthermore, one of the biggest benefits for PC owners with the Ultimate version of Game is the ability to stream Xbox games on the cloud – even games that still aren't available on PC, such as Halo 5, Fable 2, or Perfect Dark Zero. Thanks to the work of the Xbox Cloud Gaming team, all of these games are now playable on Steam Deck.
There's a detailed walkthrough on how to do it on the Microsoft Edge subreddit, as posted by the official team. It boils down to installing the beta branch of Edge on the Steam Deck, adding it to Steam, and then pasting a couple of lines into the Konsole and launch options. It seems pretty straightforward, and the team has even provided some artwork to make it look all official.
https://twitter.com/CJGluckstein/status/1504874456300154884
Xbox Cloud Gaming has been Windows not working so great on the system, this might be most people's best bet.
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