FAQ
Codex FAQ
These are the direct questions readers usually ask before signing up, switching, or comparing Codex against alternatives.
Is Codex included with ChatGPT?
Yes. As of April 14, 2026, OpenAI lists Codex inside ChatGPT Free, Go, Plus, Pro, Business, Edu, and Enterprise plans, with different limits and feature access by tier.
Can I use Codex with an API key instead of a ChatGPT plan?
Yes. OpenAI supports API-key sign-in for Codex in the CLI, SDK, and IDE extension. That route is usage-based and does not include cloud features such as GitHub code review or Slack integrations.
Does Codex support internet access and GitHub workflows?
Yes. Codex cloud tasks can be configured for public internet access, and OpenAI documents GitHub integrations for pull requests, reviews, and repository workflows.