Most leakers drop a date in a screenshot or bury it in a datamined file. Grunt.api posted a math problem. On April 8, the known Halo dataminer shared a cryptic message on X alongside a GIF of a comet: "EA: (18 × 7 × (MMXX + VI) mod 31) + 1 - OR: (8 × 7 × (MMXX + VI) mod 31) + 1." No context. No caption. Just the equations and a comet.
The community didn't take long. Players worked out that "EA" stands for Early Access and "OR" for official release, with MMXX + VI translating from Roman numerals to 2026. Solving the equations puts the Early Access date at July 23 and the full launch at July 28, across PC, PlayStation 5, Xbox Series X, and Xbox Series S. The comet, for what it's worth, is likely a nod to the Fanta collaboration skin's emblem, which was revealed as part of an Xbox x Fanta promotion that itself quietly confirmed Halo Campaign Evolved will have a custom armour system.
Grunt.api's credibility here isn't nothing. The leaker built a reputation during Halo Infinite's cycle by pulling accurate information directly from backend APIs, which is exactly the kind of technical sourcing that makes a leak worth paying attention to rather than dismissing outright. WCCFtech rated this rumour at 95% likely, citing the source's track record and the technical consistency of the information. That's a high bar, and it's earned.
What We Actually Know Going In
The date leak lands on top of a pile of corroborating information that's been building for weeks. According to a video from RebsGaming, the game is reportedly content complete and playable from start to finish, including the three new prequel missions. A development build has apparently been in testing, with the game described as "pretty much content complete" and now in a polishing and refinement phase. Halo Campaign Evolved has also been rated MA 15+ in Australia, which is the kind of bureaucratic paper trail that tends to appear when a release is genuinely close.
Microsoft and Halo Studios haven't confirmed a release window beyond "2026," so none of this is official. But a July 28 date would fit neatly with what's already been rumoured about the game's summer window, and it would give the Xbox Games Showcase on June 7 a clean moment to make it official. That showcase is already set to be followed immediately by a dedicated Gears of War: E-Day presentation, so Xbox is clearly loading up the summer. A Halo Campaign Evolved release date reveal would be the obvious centrepiece.
The real question is whether the absence of multiplayer is going to overshadow all of it. Longtime fans have been vocal about Halo Studios' decision not to remake the original's multiplayer alongside the campaign, and that disappointment hasn't quieted down. A July launch window and a five-day early access window are the kinds of details that generate excitement, but they don't answer the question of what Halo's multiplayer future actually looks like. For a game that's supposed to mark the franchise's debut on PlayStation, the pressure to deliver something that justifies the wait is considerable. July 28 doesn't leave much runway.
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