As of September 2026, the official documentation states that OpenAI Codex is provided through a structure where multiple entry points—"Codex CLI," "Codex IDE extension," "Codex cloud," and "Codex ...
Codex CLI is an open-source coding agent from OpenAI, written primarily in Rust, that runs locally on your computer. Codex IDE extension is a coding agent that runs in Visual Studio Code and its forks ...