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Derrick Choi
Engineer

Derrick Choi

Codex Leader at OpenAI

LinkedIn@derrickcchoiWebsite

Developer at OpenAI

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GPT-5 Codex1GPT-5.21

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GPT-5 Codex Ran a 25-Hour Coding Sprint
OpenAIannouncementpositiveFeb 24, 2026

GPT-5 Codex successfully completed a 25-hour coding sprint, demonstrating capability for extended long-horizon coding tasks.

“Derrick Choi conducted a 25-hour stress test of GPT-5.3-Codex, giving it a blank repository to build a design tool from scratch, demonstrating long-horizon autonomous coding capabilities.”

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