In the past couple of weeks, hundreds of vibe-coded, AI-decompiled emulators and games have appeared out of thin air. Why? Because Claude’s latest update, Claude Opus 5.5, is extremely good at decompiling.
The short of it is that a game’s source code can now be compiled and reconstructed in record time—something that used to take coders months to achieve. All of those “native” Fallout and Call of Duty: Modern Warfare ports and those AI-generated Super Mario 64 inside Elden Ring mash-up mods you may have seen are a direct result of this.
However, I think today’s example is far and away the most concerning development so far, because I’m forced to admit that these AI-decompiled web browser ports of Call of Duty: Black Ops, Halo: CE, Grand Theft Auto: Vice City, Skate 3, and The Simpsons: Hit and Run actually seem to run very well.
Sure, lawyers for Take-Two and Microsoft and whoever else can send out some cease-and-desist letters and get these taken down. But then what? These browser ports were clearly easy and fast to create, so what’s gonna stop people from just vibe-coding another version of these browser ports?
PLAY ALL THESE GAMES IN YOUR BROWSER
Your PC does not need the game installed!
you can play Black Ops zombies, Skate 3, Halo and MW2 and more GAMES all run in a browser tab now. full list in the comments.
School gaming is boutta be fire pic.twitter.com/sd98HQo8pf
— Radiant Optimizer (@RadiantOpti) October 8, 2026
This is IP protection whack-a-mole on a scale I don’t think we’ve seen since the advent of pirated DVDs. I genuinely don’t know how you put the genie back in the bottle on something like this. And the worst part is, at least where the video game publishers will be concerned, some of these run perfectly.
I played through a bunch of the web browser ports of the games linked in the thread above, and some of them seemed to be borderline flawless. In the case of The Simpsons: Hit and Run, it might even be better than flawless, because I don’t remember the game being able to target 240fps when I was a kid. It’s also extremely worrying that one of the four different web browser ports of Halo: CE I played had working online servers…and my ping was low.
Look, I’m not happy about admitting this, but it’s the truth—and it’s a pretty straightforward one at that. Most of the games that are being ported to browsers are PS2- or PS3-era titles. You know how much RAM the PS3 had? About 512 megabytes. You know how much memory my web browser is currently using as I type this? About 1,200 megabytes.
Web browser ports haven’t been limited by RAM usage for quite some time—the difference here is that Claude Opus 5.5 is an AI you can leave running overnight to decompile a game instead of painstakingly working your way through the code, like your grandpappy used to.
I don’t know where we go from here. All I can say with any certainty is that video game publishers’ legal teams are going to be working overtime for the foreseeable future.