NewXbox Game Passtiers may be on the horizon, according to some recently surfaced evidence pulled directly from Microsoft’s servers. The leak contains mentions of four codenames linked to unidentified xCloud programs, which could be related to one or more upcomingXbox Game Passmembership plans.
Microsoft last restructured its popular subscription service back in September 2024. That’s whenXbox Game Pass Standard and Core were introduced, offering access to reduced content catalogs and benefits for a smaller price. XGP Standard was an entirely new addition to the service, whereas Core was positioned as a direct replacement for Xbox Live Gold. Rumors of even more tiers being in the works have sporadically surfaced online ever since.
Continuing this trend, some circumstantial evidence pointing to new Xbox Game Pass tiers has now emerged on social media, with Bluesky user Redphx uncovering references to four unidentified “program” names recognized by the Xbox Cloud Gaming API: Callisto, Dia, Europa, and Ferdinand. In this context, “programs” refer to xCloud offerings, of which only three are currently active: Xbox Game Pass Ultimate, a bring-your-own-game plan, and alimited free-to-play Xbox Cloud Gaming option that currently includes onlyFortnite. These active programs are identified by name in the API, suggesting that the four newly discovered entries—being less descriptive—are likely codenames.
Xbox Game Pass May Be Getting Cloud-Only Tiers
Game Rant was able to independently replicate these results by querying Microsoft’s undocumented but publicly accessible API. Whether the four codenames truly refer to some unannounced Xbox Game Pass tiers is debatable, but since their mentions were pulled directly from Microsoft’s servers, there is no doubt about the authenticity of the monikers themselves. In other words,somethingcode-named Ferdinand, Dia, Europa, and Callisto related to Xbox Cloud Gaming is indubitably in the works.Cloud-only Xbox Game Pass tiersare one possible interpretation of this leak, as such offerings were rumored to be under consideration since summer 2024.
Leaked Xbox Cloud Gaming Program Codenames
The xCloud API returns program references as an array of strings. Redphx speculates that their order implies tier hierarchy, with Callisto representing the highest and Ferdinand the lowest. However, because the array is clearly sorted alphabetically—and with the Xbox Game Pass Ultimate tier listed last—this interpretation remains questionable.Ifthe order has any connection to the tier hierarchy, it’s just as plausible that Ferdinand is the highest (non-Ultimate) tier and Callisto the lowest. Even if new Xbox Game Pass memberships are coming, not every single one of these leaked programs will necessarily map to a unique tier. After all, two of the three currently available programs (xCloud BYOGand Ultimate) are both linked to a single plan, XGP Ultimate.
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As of July 23, at least 12 games have been rated as supporting one of these unannounced Xbox Cloud Gaming programs. Among them areUndertale,Doom 64, andTunic, along withViva Piñata,Assassin’s Creed Origins, andSenua’s Saga: Hellblade 2.GTA 5also appears, though interestingly, only its Xbox One version lists compatibility. There’s also one free-to-play game on the list,Genshin Impact, which is among only a handful of titles tagged as supporting all four of the unidentified programs.
