Someone at a top AI lab showed me their internal prompt stack six weeks ago.
I was not supposed to see it. I have not paid for Claude Pro since. I used to pay $200 a month. I thought the expensive model was the product. It is not. The architecture around it is the product.
The engine doesn't matter — Unity, Unreal, Godot, Three.js.
AI is there to cut the workflow down. Claude Code Opus 5 and UModeler MCP built this in about six hours, from one concept image. A place you only pictured in your head becomes somewhere you can walk through.
GLM-5.3 has been the builder the entire time.
GPT-5.6 Sol + Luna Max initially handled orchestration and review, but I hit my Codex weekly limit mid-run, so he swapped them for Opus 5 + Sonnet 5.
Opus 5 turned a dead render into a $50k sales tool
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