Microsoft may be looking at Activision support for future Halo projects, according to a new rumor that has sparked plenty of debate among fans. With both Halo and Call of Duty now sitting under Microsoft’s gaming umbrella, the idea of the two shooter franchises sharing development resources no longer feels impossible.
The claim comes from Halo-focused YouTuber and insider Rebs Gaming, who says an anonymous source told him Microsoft has been considering whether Activision studios could assist with upcoming Halo games. One name reportedly discussed is Sledgehammer Games, the Call of Duty studio known for its work on multiple entries in Activision’s blockbuster shooter series.
According to the rumor, Sledgehammer Games could potentially help with a Halo multiplayer project. However, it is important to note that Microsoft has not announced any such collaboration, and no future Halo project involving Activision has been officially confirmed.
The report also claims that Activision experimented with an early Halo prototype in June 2026. This was allegedly not a full game in production, but rather a very early blockout prototype. In game development, a blockout phase is typically used to test basic movement, level flow, combat spacing, and other fundamental gameplay ideas before detailed assets, visuals, or polished mechanics are added.
That prototype reportedly did not survive for long. Rebs Gaming claims it was scrapped in early July, suggesting the experiment may have been more of a test than the beginning of a new Halo game. Still, the fact that such a prototype may have existed at all has fueled speculation that Microsoft is exploring new ways to expand development capacity for the Halo franchise.
At this stage, there is no clear indication of which Activision studio worked on the alleged prototype. While Sledgehammer Games has been mentioned as a possible partner for a future Halo multiplayer effort, the report does not confirm that the studio was responsible for the early experiment.
The rumor arrives at a time when Halo’s development structure appears to be evolving. Rebs Gaming also pointed to the credits of Halo: Campaign Evolved, claiming that 15 studios were involved in the project. Some of those teams reportedly did more than routine support work.
Virtuos is said to have contributed heavily to areas such as environments, characters, vehicles, and weapons. Abstraction reportedly worked on campaign missions, including scripted events and gameplay balancing. If accurate, this suggests that Microsoft and Halo Studios may already be leaning more heavily on co-development than some fans realized.
That approach would not be unusual in modern AAA game development. Large-scale games often involve multiple studios working together across art, engineering, multiplayer systems, world design, quality assurance, and live-service support. As development cycles grow longer and player expectations rise, publishers frequently rely on external teams to help deliver bigger projects on schedule.
Still, the idea of more outsourcing on Halo has divided the community. Some fans are skeptical of anonymous-source rumors and are waiting for official confirmation before drawing conclusions. Others are concerned that relying on too many studios could weaken the identity and consistency of future Halo games.
At the same time, not all reactions have been negative. Many players seem surprisingly open to the possibility of Sledgehammer Games contributing to Halo, especially if the focus is multiplayer. The studio has experience building fast-paced online shooters, managing post-launch updates, and responding to community feedback, which are all areas Halo fans care deeply about.
Much of the frustration appears to be aimed less at Activision and more at the recent direction of the Halo franchise itself. Some longtime fans feel the series has struggled with inconsistent leadership, uneven releases, and missed opportunities over the past several years. For those players, outside support could be seen as a chance to bring fresh energy to one of Xbox’s most important franchises.
For now, the situation remains firmly in rumor territory. No new Halo game involving Activision has been announced, and there is no confirmation that Sledgehammer Games or any other Activision studio is officially working on the franchise. What does seem clear is that Microsoft is in a unique position: it now owns both Halo and Call of Duty, two of the most recognizable first-person shooter brands in gaming.
If Microsoft does decide to bring Activision talent into the Halo pipeline, it could mark a major shift for the series. Whether that would lead to a stronger multiplayer experience, faster content updates, or a broader co-development strategy remains to be seen. Until official details arrive, Halo fans will be watching closely to see whether Master Chief’s next chapter gets a helping hand from the Call of Duty side of Microsoft’s gaming empire.
