Code World Model: A Coding Agent as World Brain, Code for Rules, Video for Rendering

burny_tech · x · 2026-08-28

The paper Code World Model: Coding Agent as World Brain argues that world models should keep reasoning and causality in code rather than learning dynamics entirely from pixels.

A coding agent serves as the world brain, reasoning about events and generating executable code that maintains persistent world state and rule-consistent evolution.
A lightweight proxy representation (frame-wise spatiotemporal constraints compiled into a proxy video) bridges executable state and video generation—code decides what happens, the video model decides how it looks.
Data pipelines build aligned proxy-observation pairs from gameplay and real-world videos.
After fine-tuning on paired gameplay data, MiniMax-H3 follows spatiotemporal specs from simple interactive worlds built by the coding agent while preserving rich visual detail and dynamics.

The authors see this as a new path toward open-ended world models.

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Code World Model: A Coding Agent as World Brain, Code for Rules, Video for Rendering

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