OpenAI Codex use cases: 4 real examples
OpenAI's coding agent, in the cloud, the CLI and the IDE. Here is what people have got it to do.
4 use cases · Most often: software · education · creative · Updated Oct 16, 2026
All 4 OpenAI Codex use cases
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Build an Android app in 28 days with parallel Codex runs
OpenAI engineers had several Codex sessions write most of the Sora Android app in 28 days; OpenAI reports it reached #1 in the Play Store on launch day.
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Set up a semester of online course pages automatically
Cal State math professor Taiyo Inoue had Codex write small programs to update his Canvas courses; he estimates it saves four to five hours a week.
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Upgrade old web projects to a new framework version
A developer had Codex write a reusable set of upgrade instructions for the Angular web framework; he reports it upgraded three open-source projects to version 22 within a week.
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Build a small 3D island adventure game with an agent
A creator had Codex, with a 3D model maker called Tripo plugged in, build a playable island adventure game; they say it took under an hour.
