OpenAI Codex Cheat Sheet
Karen Pearl V. Pabilando2026-05-23T18:45:10+00:00What Is OpenAI Codex? OpenAI Codex is an AI-powered coding agent built on top of OpenAI's frontier models. Originally launched as a code-completion API in 2021, Codex has evolved significantly, it is no longer a simple autocomplete tool. As of 2025–2026, Codex is a full software development agent that can read your codebase, plan changes, write and edit files, run commands, review pull requests, and now even operate your computer alongside you. Codex is used by over 3 million developers weekly and is available as: A CLI (Command Line Interface) — terminal-based coding agent A Desktop App — for macOS [...]









