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Latent Space · December 10, 2025 · 75m
Harness Engineering: OpenAI's Codex Team on AI-First Development
Ryan Lopopolo from OpenAI's Frontier team discusses how they run a 1M+ line-of-code codebase with zero human-written code, pioneering harness engineering as a discipline.
This summary was generated from show notes and public descriptions, not from a full transcript review. Details may contain inaccuracies.
Canon
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Harness engineering — designing the systems, tools, and context around an AI coder — is fundamentally environment design. The harness is the environment; the model is the agent.
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OpenAI's Frontier team made the radical decision to write zero human code for their 1M+ LOC codebase, requiring the courage to trust AI-generated code at unprecedented scale.
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