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Addendum to o3 and o4-mini system card: Codex

OpenAI just shipped Codex: a cloud coding agent powered by o3, trained on real-world PRs. It writes code that passes tests.

Reporting by OpenAI Blog 1 min brief
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The KeyNews take

Why it matters

OpenAI is moving o3 from research artifact to production product layer. Codex represents the shift from model capability claims to deployed developer tooling—and signals how o3's reasoning is being monetized in app-layer products.

The key facts

5 to know

  1. Codex is a cloud-based coding agent powered by codex-1 (o3 variant optimized for software engineering)

  2. codex-1 trained using reinforcement learning on real-world coding tasks

  3. Agent trained to generate code matching human style and PR preferences

  4. Iterative test-driven approach built into agent behavior

  5. Product announcement published May 16, 2025 as system card addendum

Go to the source

OpenAI Blogopenai.com

Publisher excerpt: 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,…
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