The Call of Duty: Modern Warfare 4 open beta ran from August 28 through September 1, 2026, following an early access weekend that started August 21. With the servers now closed and the full game locked in for October 23, the beta is the clearest signal yet of what Infinity Ward is actually shipping this fall — and it's worth breaking down what changed between the two test weekends before you decide whether to pre-order.
Two weekends, two different betas
The early access period (August 21–25) and the open beta (August 28–September 1) weren't identical builds. Weekend one shipped with five of the game's six core 6v6 maps — Rooftops, Silkworm, Transit 213, and Cachette among them — plus early access exclusive to those who pre-ordered. Weekend two added the sixth map, Lithium, to the rotation and opened the beta to everyone, no pre-order required. That staggered rollout is a familiar Call of Duty pattern: reward early buyers with a few days of exclusivity, then widen the pool to stress-test matchmaking and server load at scale before launch.
Beyond 6v6, the beta included Ground War: Combat Outpost, a 24v24 mode played across two purpose-built maps, Imjin Farmland and Wolves Stadium, plus a mode called Kill Block. The single-player campaign got a preview too: for the first time in a Call of Duty beta, a full campaign mission, "Entrenched," was playable — campaign content is usually held back entirely until launch.
Warzone showed up early — and that's the real story
The bigger news buried in the beta wasn't the multiplayer maps, it was Warzone. Weekend two marked the first time a Call of Duty beta let players drop into Warzone, running Resurgence on a brand-new map called Zodiac, in Resurgence Quads and Casual Resurgence Quads playlists. Getting a battle royale map into players' hands roughly two months before launch is a bigger commitment than a couple of multiplayer maps, and it suggests Warzone integration is a priority for this release — though that's our read, not something Activision has stated.
What this means before October 23
Betas exist to catch problems, and the two-weekend structure — smaller pre-order crowd first, full open crowd second — is designed to surface server and balance issues in stages rather than all at once at launch. Nothing in the beta window guarantees the final build ships clean, but the fact that campaign and Warzone content both got early exposure may point to a studio confident enough in those pieces to let the public poke at them before release.
If you're gearing up for launch day, the beta's Ground War maps in particular reward a squad that's already dialed in on loadouts — if you play across Call of Duty and Warzone titles, the loadout logic carries over more than you'd expect, and a loadout breakdown for a comparably squad-driven shooter is a useful gut check on what actually matters in a class setup versus what's just noise. If your first exposure to the series is actually on phone rather than console or PC, the recoil-control and attachment logic carries over too — see our Call of Duty: Mobile beginner loadout guide for the mobile-specific version of that same decision-making. For everything on Modern Warfare 4's beta specifically, Activision's own recap is here: Call of Duty's official beta page.
Modern Warfare 4 launches October 23, 2026, on PS5, Xbox Series X|S, PC, and Nintendo Switch 2. The beta is closed, but what it revealed about Warzone's role in this release is the detail worth remembering between now and launch day. If you pre-ordered digitally, you don't have to wait that long for the campaign — see what's included in campaign early access, which opens October 16.