// about Codex
Codex is OpenAI's coding agent: it reads a repository, plans a change, edits files, and runs tests or linters to check its own work. It ships as a terminal CLI, a desktop app for Mac and Windows, IDE extensions, and a version inside ChatGPT itself, all running on the GPT-5 coding models. It competes directly with Claude Code and Cursor for the same job, delegating a task and letting the agent work through it end to end, and it regularly tops terminal-based coding benchmarks like Terminal-Bench.
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