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Codex Mobile App Released (Complete Setup Guide)
TL;DR
ChatGPT on iPhone can now remote-control Codex on your computer — Riley Brown calls this “maybe” the biggest ChatGPT update ever because the mobile app now connects to OpenAI’s Codex desktop app, which in turn can control your whole machine.
Setup is simple but picky about versions and Wi‑Fi — you need the latest Codex desktop build, the latest ChatGPT iOS app, and both devices on the same Wi‑Fi before the new Codex mobile connection flow appears and syncs your chats.
Plugins work on mobile; visible skills don’t — typing @ surfaces tools like documents, spreadsheets, presentations, browser, Chrome, and computer use, while / doesn’t show skills yet, though Codex can still invoke known skills through natural-language requests.
Riley’s “YOLO mode” fixes the biggest mobile coding limitation — because localhost apps running on your laptop won’t open on your phone, he creates a skill that auto-deploys every change to Vercel so each iteration returns a live public link.
This turns mobile into a legit ‘vibe coding’ workflow — Riley builds a landing page, then a Trello-style notes app with Supabase auth and database support, entirely from his phone, and tests each deployed version inside the ChatGPT app.
The broader use case is remote access to your files and workflows, not just coding — his demo has Codex browse the 50 most recent images in Downloads and publish them as a shareable photo album site while he’s “at a party.”
The Breakdown
The big reveal: ChatGPT mobile now reaches into Codex
Riley opens with maximum hype: the ChatGPT mobile app can now connect to Codex, OpenAI’s answer to Claude Code, and he says this may be the biggest ChatGPT update yet. His framing is simple and powerful: if Codex can control your computer, then ChatGPT on your phone has effectively become a remote control for your whole machine.
First-time setup: update everything, then connect on the same Wi‑Fi
He walks through the onboarding step by step: update and restart Codex, make sure the iOS ChatGPT app is current, then restart Codex again until the “connect to Codex mobile” option appears. Once both devices are on the same Wi‑Fi, the mobile app surfaces the connect flow, you authorize the account, and your chats should sync almost perfectly between desktop and phone.
How the mobile app behaves once it’s connected
Inside the ChatGPT app, Codex lives behind the top-right menu, where you can open chats, start a new thread, or work in projects. Riley’s practical tip: if you use Codex for one-off non-coding tasks, switch the layout to “chats first” instead of projects so the app feels faster and less cluttered.
Voice mode, plugins, and the current limitation around skills
Riley clearly likes using voice mode — his pitch is basically, take a walk and dispatch work hands-free. He shows that @ works for plugins like documents, spreadsheets, presentations, browser, Chrome, and computer use, while / doesn’t surface skills yet; still, if you ask for a known skill in plain English, Codex can often use it because it’s ultimately controlling the desktop app.
Notifications, full-access permissions, and a little lag
He highlights a few quality-of-life details that matter when agents run for 10 to 30 minutes: the app sends useful completion notifications, and you can tap right back into the finished thread. He also recommends enabling full access if you’re comfortable letting Codex “go crazy,” though he notes generated documents can be slow to open on the phone right now.
The localhost problem — and Riley’s “YOLO mode” workaround
The core flaw for mobile vibe coding is that locally running apps don’t open on your phone, because localhost lives on the laptop. Riley’s fix is a custom skill called “YOLO mode,” which uses the Vercel plugin to deploy every change to production automatically and return a public link each time.
Vibe coding from the phone: landing pages, dark mode, and a full notes app
He demos the loop in real time: ask for a landing page, open the Vercel link, complain that it “kind of sucks,” request dark mode and a better font, and get the same link updated with fresh changes. Then he pushes further with a mobile-optimized notes app using Supabase and a Trello-style UI, complete with authentication and database-backed lists, all built and tested from the phone.
The fun use cases: remote file access becomes shareable apps
To close, Riley shifts from coding to everyday magic: he imagines being at a party and asking Codex to pull the 50 most recent photos and videos from Downloads, turn them into a deployed gallery, and add captions to its favorite five. The result is a shareable website generated from files on his computer, which captures the bigger point of the release — this is remote agent control, not just a mobile coding companion.
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