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Jul 24, 2026 · Artificial Intelligence

How OpenAI’s Harness Engineering Template Enables Self‑Improving AI Code Generation

OpenAI’s internal team built a million‑line codebase in five months without a single human‑written line by using Codex agents, structuring the repository as a rule‑enforced environment, and iteratively automating testing, review, and maintenance to let AI drive the entire software development lifecycle.