Codex, a cloud software-engineering agent

OpenAI · May 16, 2025 · Agent

OpenAI reused the Codex name for something new: an agent that runs in its own cloud sandbox, works several tasks in parallel against a repository, and returns pull requests.

Why it matters

Moved coding agents off the developer's machine. Work being dispatched to a fleet of remote agents rather than supervised in an editor is the shape that OpenAI, Google and GitHub all converged on through 2025.

This is LLM World's historical reading, not a claim by OpenAI. The facts above and the sources below are what it rests on.

Sources

Record status: verified · confidence 85/100

Date 'May 16, 2025' read from the publicationDateText field in a Wayback capture of OpenAI's own announcement taken the next day, under the headline 'Introducing Codex'. openai.com blocks automated fetches, so the live URL was not read. Note this name collides with the 2021 Codex model and with the Codex CLI released in April 2025 — the entry here is the cloud agent.

openai.com Official announcement Primary archived