Yes — Codex is included in the current ChatGPT Plus plan at $20/month. I verified this on two official OpenAI pages: **Confirmed by official sources:** - **ChatGPT/Codex pricing page** ([chatgpt.com/codex/pricing](https://chatgpt.com/codex/pricing/)) states: *"Codex is included in your ChatGPT Free, Go, Plus, Pro, Business, or Enterprise plan."* The **Plus** tier ($20/month) lists **"Expanded Codex usage"** and includes building with the Codex app for macOS and Windows. Its usage-limit table shows Plus users get, per 5-hour rolling window: roughly **15–90 local messages** (GPT-5.6 Sol), **20–110** (GPT-5.6 Terra), **50–280** (GPT-5.6 Luna), plus Cloud Tasks and Code Reviews. - **OpenAI Help Center — "Using Codex with your ChatGPT plan"** ([help.openai.com](https://help.openai.com/en/articles/11369540-using-codex-with-your-chatgpt-plan)) confirms: *"Codex is included across ChatGPT plans, including Free and Go. Usage limits vary by plan."* You just sign in with your ChatGPT account in the Codex CLI, IDE extension, web, or desktop app. **Key caveats:** - Plus gets *expanded* (not maximum) Codex usage — Pro ($200/mo) offers "Maximum Codex tasks" with 5x or 20x more usage. - If you hit your Plus usage limit, you can purchase **additional credits** to keep working (no plan upgrade required), or run extra local tasks via an API key charged at standard API rates. - Note: as of April 2, 2026, Codex pricing shifted to API-style token-based credit consumption (per the [Codex rate card](https://help.openai.com/en/articles/20001106-codex-rate-card)). So in short: **yes, $20 Plus includes Codex at no extra cost**, with included usage limits that vary by model, and optional credit purchases beyond the cap.