OpenAI's coding agent, available in the ChatGPT app, cloud, IDE extension and CLI under one ChatGPT account.
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Codex is OpenAI's software engineering agent. It handles tasks such as bug fixing, refactors, new features, test generation and pull request review. It runs across several surfaces connected by a ChatGPT account: the ChatGPT/desktop app, Codex cloud, an IDE extension and a command-line tool (Codex CLI).
Codex can run multiple agents in parallel on local projects and in reusable cloud environments for each repository. Cloud tasks continue when the laptop is closed and can be resumed from another device. Agents can use computer and browser tools to verify their work. Plugins connect it to other tools and apps, and it can review pull requests automatically. Creators describe a /goal command that lets it run and test itself over long sessions (one run over 8 hours ended with the goal stalled), and describe it being used to build and host small apps from a prompt.
Codex is included in ChatGPT plans (Plus, Pro, Business, and others), with usage limits that rise by tier. Creator commentary mentions a planned merge with the ChatGPT app into one personal agent and a user count of 20 million; these are secondhand claims. One creator noted the desktop app does not show usage stats.
Watch the moment: the exact second top creators show it. Videos load only when you press play, via youtube-nocookie.com.
The coding mode in the ChatGPT app was used to build the AI Slop Detector from a project folder and a linked chat. Its /goal command let it keep running and testing itself, for over 8 hours, and it ended with the goal stalled.
The two mathematicians used OpenAI's Codex tool to help with their year-long work on Navier-Stokes and stored their drafts in it. This became a point of dispute over whether private drafts were used.
Desktop app, previously known as Codex, where agents work on multiple local projects at once. Used for all the long-running tests; it doesn't show usage stats.
Used inside the ChatGPT app to build the whole dashboard from a prompt; the initial build took about 15 minutes, followed by hours of iteration. It was also used to clone and install the repo, and to host the app via @sites on ChatGPT's servers.
OpenAI's coding agent. Tibo discusses harness limits such as skills, memory and sub-agents, and cloud agents beyond the laptop. He says Codex is merging with ChatGPT into one personal agent and has reached 20 million users.
Used in ChatGPT's Codex mode for fine-tuning and balancing after the Claude build. It read the design markdown file, suggested about 12 improvements, and applied fix rounds.
Overview of 15 tips for Codex in ChatGPT, including browser use (researching cameras into a spreadsheet), computer use, pinning threads, and scheduled tasks. The creator demos most of them.
Tips for Codex: threads can see each other and spawn threads with other models, and he reviews agents.md after model releases. He also covers plugins and the built-in browser, goals, remote control from a phone and hooks for safety. The threads spawning is demoed.
Redesigned Codex app, now called the ChatGPT desktop app. It is free, runs multiple agents on local files and folders, and supports saved skills and scheduled automations. Used for most of the tests.
Used with GPT-5.6 and the /goal command to run long autonomous loops. The creator uses Codex's browser as his main browser for tasks like sorting Gmail and making DNS changes.
Used as the environment to run the Remotion skill for logo reveals and motion graphics.
OpenAI's coding agent. It has a CLI, so Claude Code can call it from a skill that delegates code writing to GPT-5.5.
The creator's other primary coding agent, praised for its design and concise summaries of what it did. Supports automations, cloud agents and worktrees.
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