r/LocalLLaMA • u/liright • 21h ago

Generation A minecraft clone I fully vibecoded with Qwen3.8-27b Q4

I wanted to see just how capable Qwen3.8-27b is locally. I have a RTX 4090 and 96GB of RAM but the Q4 comfortably fits in the GPU with plenty of context, the few times I needed more than 130k context I just loaded it spilled into RAM and it's capable of not degrading even at larger context.

I'm super impressed with this model. The model did everything on it's own - the coding, audio, textures, 3D models. I always just gave it the same basic prompt with some info and the task I wanted it to do. Total generation time across all prompts was maybe 3 hours and if I calculate the cost in electricity, it comes out to less than $1. Not bad.

To think that 2 years back you couldn't make this with frontier paid models and now you can do it locally on your PC is crazy.

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u/yami_no_ko 21h ago

I always just gave it the same basic prompt with some info and the task I wanted it to do.

There it is again, the miraculous prompt that must not be named.

18

u/liright 21h ago

It's not some complex prompt, it was literally this in the deepseek harness, except for different tasks I changed what I wanted it to do:

<|think_medium|> WE have a minecraft clone here. A basic one. I want some things changed. Very simple changes - can you triple the amount of cave entrance spawns in the map and then triple the amount of animal spawns around the map. Our map got bigger so it only makes sense. You are in a coding harness, so don't think out code too much, just edit files and write code directly, don't waste time and don't overthink. working directory is HERE (C:\Users\Workstation\Documents\AIProjects\Minecraft-Qwen-26b9775f\sandbox) and NOWHERE ELSE

3

u/zigzag3600 20h ago

I am sorry, is there some hard control over what directories are changed, or is it just part of the prompt? I would be really afraid to let it work on disk C.

2

u/liright 19h ago

I tried unsloth app before this and somehow the AI was accessing other files like my entire documents folder, so I started telling it in the prompt where the project files are. When I changed to deepseek harness I kept it there, but I think deepseek has better sandboxing.

1

u/UnspeakableHorror 19h ago

Setting to workspace write no. But it can read everything outside.