Overview
OpenAI’s cloud-based autonomous coding agent that runs tasks in parallel sandboxes, separate from the legacy Codex API model.
Details
Codex is OpenAI’s cloud-hosted autonomous coding agent (relaunched in 2025, distinct from the original Codex model deprecated in 2023). It runs tasks in parallel sandboxed environments, ingests GitHub repositories, reads issues, writes code, and submits PRs. Available to ChatGPT Plus, Pro, Team, and Enterprise users via web and IDE integrations, Codex handles long-running async work like bug fixes, feature implementation, and code understanding.