Just so everyone who reads this understands; despite the criticism in this comment, it's being incredibly charitable to LLMs in the context of making games. They're not particularly good at it and you wouldn't want most of the code they write in your game and especially not in the underpinnings of your game.

It's not true as a general rule that they could give you correct small code snippets five years ago; I had frontier models not even understanding enough of the OpenGL API to make separate framebuffers correctly. I asked this as a test and the resulting recommended code would of course compile, but leave someone who didn't already know the correct way to do it staring at a black screen and potentially spending the next hour debugging that.

If you think you're somehow going to make an actual game worthy of people's time with LLMs, you are almost certainly mistaken. Not only because it'll be a complete, unworkable mess with really bad fundamentals, but also because if you're vibecoding the actual technical part you probably also think game design is just about "having ideas" or something else that's really reductive and incorrect.

Seems visulization is still too expensive and sluggish. I tried to build things like tetris and snake eater with fable5 and got-5.6 sol, 90% of build successful in one shot and remaining needs 1~2 rounds debug. The whole experience is much better than months earlier, where a snake eater takes me 3~4 manually compile/run and input the error message and abnormal manually again and again.

But I am curious about building a larger scale game with/without professional engines like Godot. I highly doubt the model/agent is intelligent enough to setup the entire development environment correctly, thus may be struggle to test and debug themselves. Maybe something like GUI-agent a future?

Depends a lot on what model you use. Claude Sonnet/Opus, Deepseek, Mimo, M3 are smart enough to figure out how to create debug views, add single-frame screenshot and testing harnesses.

BTW, I also tried to make a entire LLM-driven bot to play boardgames like chess or mahjong, but it has the same latency issues since most of the online platforms have strict per-turn time limit like 15-30s, which is almost impossible for LLM/agent to react in time.

Sounds like every other plagiarist.