#agent architecture

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A CI runner node drawn part way out of a short rack on its extension rails, its lid tilted open over the boards inside, seen past a developer desk with a laptop and two monitors

OpenAI Codex as a Software-Engineering System: Models, Harnesses, and Evidence

Codex is best understood as a changing stack of models, tools, execution boundaries, state, and review mechanisms—not as a single code-generating model.

By Brecht Corbeel · August 8, 2026 · 12 min read

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