OpenAI · Official · Blog Article
Addendum to o3 and o4-mini system card: Codex
Summary
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.
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Hype check
2/5Worth a look
Rated low: routine. Worth knowing, not worth rearranging your day for.
Prior coverage our earlier items on the same thing
- Introducing GPT-4.1 in the APIOpenAI News
- Coding with OpenAI o1OpenAI News
- Surging developer productivity with custom GPTsOpenAI News
Questions people ask
- Where can I read the full story?
- On OpenAI News. The "Read this on OpenAI News" link above opens the original in a new tab. Subvolts publishes a summary and analysis, never the full piece.
- What does this mean for ChatGPT?
- Codex is a cloud-based coding agent. Codex is powered by codex-1, a version of OpenAI o3 optimized for software engineering.…
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Page generated Sep 3, 2026. Summaries are Subvolts' own; the story belongs to OpenAI News.