Did Rockstar Rebuild Its Engine For GTA 6? Here's What We Know

Grand Theft Auto VI has been in development so long that GTA V is now old enough to have its own nostalgia cycle. So when a former Rockstar developer floated a theory last week about why the wait has stretched this far, gaming forums lit up fast.

Rob Carr, a former audio engineer at Rockstar who worked on GTA titles and L.A. Noire, told the Kiwi Talks YouTube channel that he believes Rockstar has "rebuilt the entirety of the Rage Engine" for GTA 6. His reasoning is straightforward: the Rage Engine has powered Rockstar's open-world games since GTA IV, and given how dramatically game architecture has evolved since then, a full rebuild would make sense. "I'll be amazed if they didn't," Carr said, noting that GTA V was, easy to forget, three console generations ago.

What a Rockstar source actually said

Here's the thing: Carr's theory isn't wrong, exactly, but it's not the full picture either. Kotaku reached out to a source with knowledge of Rockstar's internal development, and the response was measured. The source didn't dispute Carr's credibility, but clarified that Rockstar's approach is more iterative than a clean-slate rebuild. GTA 6's version of Rage builds on work done for GTA V and, significantly, Red Dead Redemption II, rather than starting from zero.

That tracks with how Rockstar has historically operated. The studio shares code and engine technology across projects and studios, meaning RDR2's advances in physics, animation, and world simulation almost certainly fed directly into GTA 6's development pipeline. Carr himself acknowledged this in a separate part of the same interview, suggesting GTA 6 would carry over features first seen in RDR2.

So the Rage Engine has almost certainly been updated, expanded, and pushed well beyond what it could do in 2013. Calling it a "complete rebuild" is probably an oversimplification, even if the end result looks nothing like the engine that shipped with GTA V.

Why the development timeline still raises real questions

The engine theory is one piece of a larger puzzle. Past reporting has pointed to remote work slowing Rockstar's development pace, and community speculation has long held that GTA 6's scope has ballooned significantly during production. Managing a game of that scale, regardless of the engine's origin story, is genuinely hard.

What most players miss in these conversations is that engine work and game development don't happen sequentially. Teams build the game while the engine is still being refined underneath them. A major engine overhaul mid-production isn't just a technical challenge, it cascades into every system that depends on it. If Rockstar was substantially reworking Rage while simultaneously building GTA 6's world, that alone could account for years of extra time.

The save/load rumor that deserves a hard pass

While credible speculation about the engine is worth discussing, not every GTA 6 rumor clears that bar. UK tabloid PopBitch recently claimed the game's delay stems from a laid-off developer leaving the save and load system broken, and that early versions of GTA 6 were never built with saving in mind. The claim is as implausible as it sounds. According to sources familiar with the project, GTA 6 has functional saving and loading. File that rumor under fiction.

The key here is separating signal from noise as GTA 6 approaches release. Carr's engine theory, even if slightly overstated, comes from someone who actually worked at Rockstar and has relevant technical context. The PopBitch claim does not.

For a full breakdown of everything confirmed about the game so far, the Grand Theft Auto VI Wikipedia page has a solid running summary of official announcements and verified details worth bookmarking as the release date gets closer.