Dispatch
Codex lead Tibo Sottiaux walks through how OpenAI actually built it
The Pragmatic Engineer published a 2026-09-09 interview with OpenAI's Tibo Sottiaux on how Codex was built and how it is changing software development inside OpenAI. It is a first-party engineering account rather than a product post, and it pairs with the same newsletter's 2026-09-08 piece arguing code review is being rebuilt around risk triage because AI now generates more code than developers can read. Both are useful for anyone deciding how much of their own review process to hand to an agent.
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