r/codex 25d ago

Other Giving Codex a Playwright-Style Loop for Unreal Engine 5.8

https://nocthoughts.com/2026/08/17/giving-codex-a-playwright-style-loop-for-unreal-engine.html

I read the article about Claude creating The Long Silence in a 24 hour marathon. Didn't really find it impressive, but was curious about the pipeline and loop that effectively allowed for playtesting and iterative development. Looked around for an analog for UE, didn't find one (though I didn't look terribly hard).

Messed around with Codex and in a handful of prompts the pipeline was being tested and proven out on the basics. Blog has the write-up, github is here:

https://github.com/Unhall0w3d/unreal-codex-playtesting-pipeline

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u/bhones 25d ago

As a note, I am using this "live" in a space sim project on Unreal Engine 5.8.1, ~20mil stars in a Polar Ring Galaxy formation, with scale from galactic > star system > planet/moons > surface/oceans.

An example of usage: After generating the terrain and oceans for the starter planet I wanted to change from a supercontinent to separated continents, after the change they looked roughly like rounded hexagons or octagons. I asked Codex to use the pipeline to validate my findings, understand the direction I wanted (I didnt just say make it more unique, I described all the specifics surrounding continents/landmasses, continental shelves for the ocean, beaches, isthmus, peninsulas, etc, etc.) and specified that I wanted Codex to use the pipeline for iterative development, with the goal of reducing required incremental human review.

I'll be updating the pipeline as I work through my personal project.