Hundreds of AI-decompiled and vibe-coded game clones have appeared online in recent weeks, ported to run directly inside web browsers, according to a report by Kotaku's Lewis Parker. The wave includes major titles such as GTA: Vice City, Halo: CE, Call of Duty: Black Ops, Skate 3 and The Simpsons: Hit and Run.
The trigger is Claude Opus 5.5, Anthropic's latest model update, which Parker describes as extremely good at decompiling. Tasks that once took coders months can now be reconstructed in record time, and the results are playable in a browser tab without installing anything.
Why AI Decompiling Changed Everything
Decompiling means reconstructing a game's source code so it can be recompiled elsewhere. According to the report, Claude Opus 5.5 can be left running overnight to do that work, replacing the painstaking manual process that older tools required.
Most of the games being ported are PS2- or PS3-era titles. Parker notes that a PS3 had around 512 megabytes of RAM, while his browser was using roughly 1,200 megabytes, so memory is no longer the bottleneck it once was.
GTA: Vice City, Halo and Call of Duty Browser Ports Tested
Parker played several of the browser ports himself and found some of them borderline flawless. In the case of The Simpsons: Hit and Run, he wrote that the browser version could hit 240fps, a framerate he does not remember from the original.
He also flagged a more serious detail: one of the four Halo: CE browser ports he tried had working online servers, with a low ping. A social media post from an account called Radiant Optimizer listed Black Ops zombies, Skate 3, Halo and MW2 among the games running in a browser tab.
- GTA: Vice City — playable in a browser tab, no install needed
