OpenAI Codex CLI

Terminal coding agent (OpenAI)

Free tier + paidAI IDEs & coding agentsdevelopers.openai.com

What it is

OpenAI's open-source terminal agent, rewritten in Rust, that reads, edits and runs code inside a sandboxed working directory. It is bundled with ChatGPT subscriptions rather than sold separately, and defaults to gpt-5.6-sol at medium reasoning, with Terra and Luna covering cheaper everyday work.

Why it earns a slot

If you already pay for ChatGPT this is effectively free extra capacity with no second bill. The Codex models are tuned for long autonomous runs, and the sandbox defaults are stricter than most rivals ship with.

Know before you commit

OpenAI models only — no Claude or Gemini. Usage moved to token-based credits in April 2026, and GPT-5.4 and GPT-5.5 retire on 31 August 2026.

Getting started

curl -fsSL https://chatgpt.com/codex/install.sh | sh

Field notes

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Field check

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Pricing snapshot

Bundled with ChatGPT Go $8 · Plus $20 · Pro $100-$200 · Business $25/user · or API key

Snapshots move fast — verify at checkout, and post a field note if it changed.

Drop into your Lovable chat

Evaluate OpenAI Codex CLI (https://developers.openai.com/codex/cli/) for this project, then use it only if it fits what we are already building.
Context: Terminal coding agent (OpenAI). OpenAI's open-source terminal agent, rewritten in Rust, that reads, edits and runs code inside a sandboxed working directory. It is bundled with ChatGPT subscriptions rather than sold separately, and defaults to gpt-5.6-sol at medium reasoning, with Terra and Luna covering cheaper everyday work.
Reviewer notes (general, not written for this codebase): If you already pay for ChatGPT this is effectively free extra capacity with no second bill. The Codex models are tuned for long autonomous runs, and the sandbox defaults are stricter than most rivals ship with.
Watch out for: OpenAI models only — no Claude or Gemini. Usage moved to token-based credits in April 2026, and GPT-5.4 and GPT-5.5 retire on 31 August 2026.
Pricing: Bundled with ChatGPT Go $8 · Plus $20 · Pro $100-$200 · Business $25/user · or API key
Setup: curl -fsSL https://chatgpt.com/codex/install.sh | sh
Rules: treat the notes above as background only. Do not assume a theme, style, layout or feature that is not already in this project — inspect the existing code first and ask me before changing visual direction.

/api/public/tools/openai-codex-cli