What chat gpt codex is in 2026: one coding agent that runs in the ChatGPT app, a desktop app, the CLI, your IDE and the cloud, on the plan you already pay for.
Read the full page: https://chat-gpt-codex.github.io/
Codex is for people who already live in a repository and want an agent that can take a long task and stay with it, across the desktop app, the terminal, an IDE and the cloud, with the same account and the same rate limits everywhere. It is not for someone whose real goal is one small site or app, because you still need somewhere to run the code, a repo to put it in, and the judgement to review what the agent wrote. The caveat is that the generous access is explicitly temporary: inclusion on Free and Go was announced as limited-time. If you just want a finished project as files, Begin.sh turns a prompt or a URL into a downloadable build instead.
- What chat gpt codex is now — The name has moved twice, which is why the search results are confusing. Codex started in April 2025 as a coding agent for developers. In February 2026 OpenAI s
- Which plan gets you in — When the app launched, OpenAI said it was including Codex with ChatGPT Free and Go for a limited time, and doubling rate limits on Plus, Pro, Business, Enterpri
- Skills, automations and parallel agents — Three capabilities distinguish the app from a chat session. Skills extend the agent past code generation, so it can be pointed at work that has a repeatable sha
- Who is running it in production — The Codex page lists Heidi, NVIDIA, Cisco and Shopify among the teams using it, which tells you the target is a working engineering organisation with review pro
- When a coding agent is the wrong tool — There is a category of request that looks like programming and is really assembly: a landing page, a small marketing site, a copy of a layout you already like,
Try Begin free: begin.sh
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Last reviewed: 2026-09-22