OpenAI Blog · May 16, 2025
Addendum to o3 and o4-mini system card: Codex
Reviewed by Errol Vogt, Site support technician & online learning analyst · original summary · editorial policy
Addendum to o3 and o4-mini system card: Codex. Codex is a cloud-based coding agent. Codex is powered by codex-1, a version of OpenAI o3 optimized for software engineering. codex-1 was trained using reinforcement learning on real-world coding tasks in a variety of environments to generate code that closely mirrors human style and PR preferences, adheres precisely to instructions, and iteratively runs tests until passing results are achieved. This update is relevant for small-office operators tracking changes in their tools.
Operator takeaway: For operators: review whether 'Addendum to o3 and o4-mini system card: Codex' affects your current setup before relying on it in production.
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