OpenAI’s latest system card introduces Codex, a cloud-based coding agent powered by the codex-1 model, a version of OpenAI’s o3 optimized for software engineering tasks.
Trained with reinforcement learning on real-world code, Codex mimics human coding style, rigorously follows instructions, and iteratively tests until success. It operates in isolated cloud containers with no internet access, using preloaded user-defined environments.
Codex reads, edits, and tests code while documenting actions with verifiable logs. Users can inspect results, request refinements, or export diffs as GitHub pull requests or local code. Codex aims to make software development faster, verifiable, and more reliable.
