OpenAI Codex Builds Full x86 Assembly Arcade Game With Minimal Human Input

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A developer ran an experiment to test how autonomously OpenAI's Codex could handle an entire software project, choosing 16-bit x86 Assembly as a deliberately difficult environment. The goal was to recreate an Asteroids-style arcade game using DOS VGA Mode 13h, with no game engine or external libraries. The human's role was strictly limited to defining the objective, playtesting milestones, and reporting bugs — no code was written or manually built by the experimenter. Codex independently handled architecture, implementation, debugging, documentation, Git management, and builds throughout the project. Only two gameplay bugs went undetected by Codex during the entire development process, both of which it subsequently fixed and verified on its own.

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