What Codex Is and How It Works
Codex is an AI coding agent from OpenAI. It can build web pages, fix bugs, run tests, edit files and ship full projects on its own. This is different from ChatGPT, which only writes text. Codex does the actual work.
Before the May 14th 2026 update, Codex only worked on your computer. You had to sit there and watch it. Now Codex lives inside the ChatGPT app on your phone. This works on both iOS and Android. The update rolled out to every plan, including the free one. That means you can use Codex even if you never paid for anything.
For SEO, this matters because ranking on Google depends on your website: fast pages, clean code, good structure. Codex can build all of that for you. Now you don't have to be at your desk to make it happen.
Main Features of the Codex Update
Here are the key features of this update:
- Remote control. Your phone becomes a remote control for Codex. You start a job on your computer, then walk away. Your phone shows you everything live.
- Notifications. Your phone buzzes when a build finishes, tests pass, or Codex needs your approval. You only look when it matters.
- Goals. Instead of giving tiny instructions one at a time, you give Codex a big finish line. For example: 'Make every page on my site load fast and pass all the speed tests Google cares about.' Codex keeps working until the goal is met.
- Side chat. You can ask Codex a question while it runs a job. The main work keeps going. Nothing gets mixed up.
- File previews and inline comments. Before you approve a change, you can open the file and look at the real code. You can tap right on the file and leave a comment exactly where you want a fix — just like notes on a Google Doc.
How to Set Up Codex on Your Phone
Getting started is simple. Follow these steps:
- Open the ChatGPT app on your iPhone or Android phone. Make sure your app is updated to the latest version.
- Log in to your account. Free plans work — no subscription needed.
- Find the Codex feature inside the app. It is now built into the same interface you use for chatting.
- Start a task on your computer if you want to run code there, or start a new job directly from your phone. For SEO work, it's easiest to begin on your computer, then walk away.
- Once the job is running, you will see live progress on your phone. You can check work, approve changes, switch models, or start brand new tasks — all from your pocket.
How to Use Codex for SEO: Walkthrough Examples
Here is how you use Codex for SEO in real scenarios shown in the episode:
Build a landing page. Tell Codex: 'Build me a fast landing page about AI automation that loads quick, ranks on Google, and shows people why AI grows their business.' Hit go, then walk out the door. Codex builds the page while you are away. Your phone buzzes when it is done. You check the page on your phone.
Fix slow pages. Ask Codex to fix the pages on your site that hurt your Google rankings because they load too slowly. Go live your life. An hour later your phone buzzes: pages are faster now. Tap approve. That is it.
Use goals. Instead of saying 'fix this one page,' you give Codex a goal: 'Make every page on my site load fast and pass all speed tests Google cares about.' Codex plans, builds, tests and tries again until the goal is met. You only step in when it needs you.
Review with file previews. Before approving a change, open the file on your phone. Look at the real code. Check title tags, headings, page speed and structure. If something needs fixing, tap on the file and leave an inline comment. Codex reads your note and fixes it.
Results, Tests and Comparisons from the Episode
Julian showed the biggest change: before this update, Codex only worked on your computer. You had to sit there and watch it. If it got stuck, you were stuck too. You could not leave your desk. Now the phone lets you walk away.
This flips the old way around. Before, you sat and waited for AI to finish. Now the AI does the work and only taps you on the shoulder when it really needs you. For SEO, this means you can move much faster. You can build more pages, fix more issues, test more changes and ship more sites — all while you go about your day.
The episode did not share hard numbers or A/B test results. It focused on the workflow change: no more babysitting. Your phone buzzes you when the work is done.
Tips, Limits and Mistakes to Avoid with Codex
Here are honest things to keep in mind. This feature is still a preview, so it is early. It only works with a Mac for now. The phone is a remote control, not a full computer. You are reviewing and steering, not typing out full code on your phone.
Do not assume Codex is perfect. Always check file previews before approving changes. The details matter for SEO: title tags, headings, page speed and structure. One tiny mistake can hurt your rankings. Use inline comments to tell Codex exactly what to fix.
Do not treat the phone as your only tool. Start heavy jobs on your computer. Walk away. The phone is for supervision, not initial setup. And remember: building a fast site is only half the game. If nobody finds it on Google, it sits there doing nothing. Use Codex to build, but also focus on getting traffic.
Who Codex Is For and Why It Matters
Codex is for anyone who does SEO. If you run SEO for your own business, you win because you build faster. If you are a freelancer juggling client sites, you win because you can check work between meetings. If you are on a team, everyone can review changes from their phone. If you are just getting started with SEO, the AI does the heavy lifting while you learn.
The bigger picture: AI coding tools used to be something you sat down to use. Now they run in the background while you live your life. You check in only when your brain is actually needed. This changes how you build and grow online. For SEO, you can now move way faster. The winner won't just be the person who builds fast — it will be the person who gets found on Google.
