Why has Grand Theft Auto 6 taken the longest of any Rockstar Games title to develop and release? If you ask a former Rockstar developer, it's probably because the studio "rebuilt the entirety of the RAGE engine."
Rob Carr, a former audio designer who worked on Grand Theft Auto V, L.A. Noire, Red Dead Redemption, and Red Dead Redemption 2 at Rockstar, told KiwiTalkz this in a recent interview:
I know nothing about it, other than the fact that they probably will have, given the time frame of how long it's taken them to get to this stage, they've probably rebuilt the entirety of the Rage Engine. That's the only thing I can say with real genuine confidence.
He added:
I'll be amazed if they didn't because the architecture of technology has advanced significantly since GTA 5, which again, easy to forget, that was three generations ago. That was the last one to be released on 360 and PS3.
A game engine is the foundational technology that everything else sits on top of. It is the software that handles how the world is rendered on screen, how physics work, how sound plays, how characters move, how lighting and shadows are calculated, how the game loads its world as you drive through it, and thousands of other technical processes that happen every frame.
When you drive around Los Santos and see the sun reflect off the ocean or watch a car crumple in a collision, the engine is what makes all of that possible.
Rockstar's engine is called RAGE, which stands for Rockstar Advanced Game Engine, and debuted in 2006 in Rockstar Games Presents Table Tennis. Since then, RAGE has powered every major Rockstar release: Grand Theft Auto IV, Red Dead Redemption, Max Payne 3, L.A. Noire, GTA V, and RDR2, and each game used a progressively upgraded version of the engine.
Rockstar has never officially named each version, but it's interesting that Carr says Rockstar didn't just upgrade the engine used for GTA 6. Instead, it actually rebuilt it from the ground up. This means that Rockstar took its sweet time rewriting the core systems that everything else depends on, to take advantage of hardware and software capabilities that did not exist when the previous version was written.
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Former Rockstar North technical director Obbe Vermeij explained the rationale behind using an in-house engine, telling us that it gives the studio a level of control over its open-world systems that no off-the-shelf engine can match.
A rebuilt RAGE engine, purpose-built for GTA 6's scale and the current console generation's capabilities, would represent the most significant investment in proprietary game technology that any studio has ever made. No wonder then GTA 6 has taken this long to make and reportedly has cost Rockstar and Take-Two Interactive $3 billion so far.
GTA 6 launches on November 19, 2026. When it does, the engine running under the hood will be the thing that determines whether the game feels like a generational leap or an incremental improvement. If Carr is right, and Rockstar did rebuild RAGE from the ground up, then everything we have seen in the first and second trailers is not the ceiling of what the engine can do, it's just the floor, and this is the answer to why it took so long. It always was.
