How Good Is GPT-5 Codex? I Built an App
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I put GPT-5 Codex to a real test: I handed it a PRD in VS Code, ran it with Codex CLI, and timed how long it took to build a working, on-device app. Watch the full build—planning → coding → debugging → demo—to see where GPT-5 Codex shines, where it stumbles, and if it’s ready for real projects.
Website: https://engineerprompt.ai/
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