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PAGAI Tools
#4 in Coding & IDE agentsFree tier

OpenAI Codex

OpenAI's coding agent across the CLI, IDE, web, and cloud.

Codex is OpenAI's coding agent. It can work in a CLI, an IDE extension, on the web, and in cloud tasks that run in parallel. Access is tied to ChatGPT plans, with a separate usage-based path through the OpenAI API.

Official site

Why this rank

If you already pay for ChatGPT, Codex is the coding agent on that account, including cloud tasks, instead of a second IDE subscription.

Best for

ChatGPT subscribers who want a coding agent.

Pricing

Included with ChatGPT plans, with lighter access on lower tiers and more room on Plus and Pro. API use is billed separately at API rates. See openai.com/codex for which surfaces your plan includes.

Pricing checked November 7, 2026. Confirm it on the official site.

Before you commit

  • Cloud features and model access depend on the ChatGPT plan.
  • An API key does not include the hosted cloud features that come with ChatGPT.

Also look at

  • Claude Code — Anthropic's coding agent in the terminal, IDE, desktop, and browser.
  • GitHub Copilot — Completions, chat, and a coding agent inside GitHub and your IDE.
  • Cursor — AI-native editor with an agent in the same window.