Codex is OpenAI's coding agent platform for software development. Available as a cloud agent, open-source CLI (built in Rust), IDE extension, standalone app, and SDK. Powered by GPT-5.4 (1M token context) and GPT-5.3-Codex (400K tokens). Included with ChatGPT Plus, Pro, Business, Edu, and Enterprise plans.
Cloud agent runs tasks in isolated sandbox environments — write features, fix bugs, run tests in parallel, then review proposed PRs. CLI runs locally in your terminal, reads your codebase, and makes multi-file edits. Supports context compaction for long-horizon tasks spanning hours. Integrates with GitHub, Slack, and Linear.
See what Codex costs for 1 developer and for a team, next to the other agents, on the AI agents pricing page.
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