Ever since Gearbox teased the next entry in the looter-shooter franchise that made cel-shaded chaos famous, fans have been asking one technical question more than most: what is the Borderlands 4 engine, and how will it change the way we play? I’ve put hundreds of hours into every mainline Borderlands game, so I know exactly how frustrating those old engine bugs could get, from missing loot drops to constant loading screens mid-co-op session. We’ve dug through official Gearbox announcements, developer interviews, and playtest leaks to put together everything you need to know about the tech powering the next Borderlands game.
Core Details of the Borderlands 4 Engine
Gearbox officially confirmed back in 2023 that Borderlands 4 will run on Unreal Engine 5, ditching the custom modified Unreal Engine 4 build that powered Borderlands 3, Tiny Tina’s Wonderlands, and New Tales from the Borderlands. The studio has been working with Epic Games’ engine team for over three years to customize the build specifically for Borderlands’ signature art style, so you won’t lose that iconic over-the-top cel-shaded look you love. That doesn’t mean it will look identical to past games, though. The new engine lets developers add far more environmental detail, dynamic lighting, and physics effects that don’t break the franchise’s distinct visual identity. For example, explosions will now throw debris that interacts with other objects in the world, instead of just being a pre-animated effect that disappears after a few seconds.
Early playtest footage shows that character models also have far more detail, with smoother animations for reloads, melee attacks, and movement that make the game feel far more responsive than past entries. Gearbox has stated that they prioritized retaining the franchise’s goofy, fast-paced feel over hyper-realistic graphics, so you won’t notice any weird, uncanny valley changes to your favorite Vault Hunters or NPCs.
Key Gameplay Improvements Tied to the New Engine
The shift to a new engine isn’t just about better graphics. Every part of the gameplay loop is getting upgraded thanks to Unreal Engine 5’s built-in tools, and Gearbox has shared a handful of confirmed changes so far that will make playing Borderlands 4 feel far smoother than any past entry. The most impactful changes for regular players include:
- Seamless open world loading: No more waiting for loading screens when you move between different zones on a planet, or when fast traveling to a friend’s co-op session. The engine’s world partition tool lets the game stream in new areas in the background without interrupting gameplay.
- 100+ enemy spawns per combat encounter: Past Borderlands games capped enemy counts at around 30 per encounter to avoid performance drops. The new engine lets developers throw far more foes at you at once, making large-scale boss fights and raid encounters feel far more chaotic and rewarding.
- Persistent world changes: If you blow up a bridge or knock over a tower during a mission, that change will stay in your world even if you leave the area and come back later, instead of resetting to its original state like it did in past titles.
- Smarter enemy AI: Enemies will now work together to flank you, take cover dynamically, and adjust their tactics based on the weapons you’re using, instead of just running straight at you in predictable patterns.
We’ve heard from playtesters that even early builds of the game run at a steady 60 FPS on last-gen consoles with all these features enabled, so you won’t have to upgrade to a PS5 or Xbox Series X/S to enjoy most of these improvements if you don’t want to. That’s a huge win for players who haven’t been able to get their hands on a new console yet, especially since so many modern releases are dropping last-gen support entirely.
How the Engine Upgrades Boost Co-op and Multiplayer
Borderlands has always been at its best when you’re playing with friends, and the Borderlands 4 engine fixes almost all of the biggest co-op pain points from past games. First off, cross-play is now fully supported across every platform, with no restrictions on which storefront or console your friends use. You won’t have to worry about being locked out of a session just because you own the game on Steam and your friend bought it on the Epic Games Store, or you play on Xbox and they play on PlayStation. Cross-progression is also fully built into the engine, so you can pick up where you left off on any device without losing your character builds, weapon collections, or mission progress.
Past Borderlands games had cross-play added as a post-launch patch, which meant it was buggy and limited for years. Building it directly into the engine from day one means those bugs won’t exist at launch, and Gearbox can roll out new multiplayer features far faster after release. Even small quality of life changes, like being able to drop weapons for friends without them glitching through the floor, or being able to join a session mid-mission without having to restart the entire quest, are all fixed thanks to the new engine’s improved netcode. If you’ve ever lost a god roll drop because it fell through the map during a co-op session, you know how big of a deal that is.
Trade-Offs and Limitations to Keep in Mind
It’s not all good news, though. The shift to Unreal Engine 5 does come with a few small downsides that long-time fans might notice at launch. For one, mod support will be far more restricted at launch than it was for Borderlands 2 and Borderlands 3. Unreal Engine 5 has stricter anti-cheat tools built in, which means fan-made mods that change gameplay mechanics or add custom content will need to be approved by Gearbox first before they can be used, even in single player. The studio has said they’re working on an official mod support tool that will launch 6 to 12 months after release, but you won’t be able to use any of the fan-made mods you relied on in past games right away.
File size will also be significantly larger than past Borderlands titles, with early estimates putting the launch download at around 120 GB. That’s almost double the size of Borderlands 3’s launch file, so you’ll want to clear out space on your hard drive ahead of release if you’re planning to pre-load the game. Also, split-screen co-op on last-gen consoles will be limited to two players, instead of the four player split-screen that was available on Borderlands 3. Four player split-screen will still be available on next-gen consoles and PC, though, so that only impacts players who are still on PS4 or Xbox One and play with people in the same room. These are all small trade-offs for the huge improvements the engine brings, but they’re worth knowing ahead of time so you don’t get caught off guard when the game launches.
At the end of the day, the Borderlands 4 engine is the biggest upgrade the franchise has gotten in over a decade, and it fixes almost every complaint fans have had about past titles. The shift to Unreal Engine 5 doesn’t just make the game look better—it makes the entire gameplay loop smoother, more chaotic, and more fun to play both alone and with friends. The small trade-offs around mod support and file size are more than worth it for all the quality of life improvements, dynamic world features, and better co-op support the new engine brings. We’ll update this post as Gearbox shares more details about the engine and its features ahead of the game’s official launch.