Codex Agent Runs for 4 Hours Straight to Build Complex A/V Library
___Patrice___ · x · 2026-08-08
A developer tested the OpenAI Codex agent by letting it run continuously for 4 hours on a complex task. The agent successfully built a library covering file parsing, audio/video processing, and multiplexing.
Impressively, to ensure the output hashes matched perfectly, it autonomously investigated and reproduced a weirdness in the MMX Lanczos resize algorithm. This ability to autonomously debug and resolve highly specialized issues demonstrates the immense potential of current AI coding agents in deep engineering workflows.
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