How to code with Codex on mobile: a complete 15-minute tutorial
Learn to use the built-in Codex function of ChatGPT mobile version in 15 minutes to write code, connect to the warehouse, and deploy online anytime and anywhere
Tutorial Objectives
Learn to use the built-in Codex function of ChatGPT mobile version in 15 minutes to write code anytime and anywhere. This article is a complete step-by-step tutorial, from installation to completion of the first project.
What will you build?
- Remote Coding Environment: Open ChatGPT on your mobile phone and start the Codex terminal directly
- Code Warehouse Connection: Connect Codex to GitHub warehouse and edit in real time on mobile phone
- Project Deployment: Use Codex to complete a small web application and deploy it online
Preparation list
- ChatGPT account (the free version is enough, supports the basic functions of Codex)
- Smartphone (iOS or Android, install ChatGPT official app)
- GitHub account (optional, used for warehouse synchronization) -Basic programming concepts (not required, novices can also follow along)
Overall architecture
The tutorial is divided into 4 modules. If you follow the sequence, you can start from scratch and complete a real coding project with your mobile phone in 15 minutes.
| Module | Input | Output | Estimated time |
|---|---|---|---|
| 1. Install and start Codex | ChatGPT account + mobile phone | Codex terminal interface | 3 minutes |
| 2. Create your first project | Codex terminal | A runnable Python script | 4 minutes |
| 3. GitHub synchronization | GitHub account | Push code to remote warehouse | 4 minutes |
| 4. Deployment and online | Codex terminal + free cloud service | Publicly accessible URL | 4 minutes |
Step 1: Install and start Codex
Open the ChatGPT mobile app and make sure you've upgraded to the latest version (check the iOS App Store or Google Play store for updates).
There are two ways to start Codex:
| Method | Operation | Description |
|---|---|---|
| Conversation start | Enter "Start Codex" in the chat input box | The most direct, suitable for quick tasks |
| Menu startup | Click "..." at the bottom for more menus → Select Codex | More complete functions, suitable for long-term projects |
Upon startup, ChatGPT automatically creates a Codex session. You'll see a terminal-style interface with input boxes at the bottom. This is your mobile development environment.
Tip: Codex is also available in the free version of ChatGPT. All you need to do is log in to your ChatGPT account. The paid version (Plus/Pro) offers faster models and higher usage limits.
Step 2: Create your first project
Enter a natural language command into the Codex terminal to describe the code you want to build. There is no need to remember the specific command syntax.
For example, enter:
Python Flask Web ， REST API
， /hello JSONCodex 、。 1. 2. （ Flask） 3. 4.
| ， | ||
| Codex | ||
| " /hello /greet" | ||
| "" | Codex |
， ChatGPT Plus GPT-4 。
3 GitHub
Codex GitHub 。
/github connect <URL>
Codex 。，
- （Codex ）
- （
/github commit -m "Update instructions"）
****，
/github init，Codex 。
4
，Codex 。
，
Codex （ Render、Fly.io Railway），， URL。
，Codex 。 Codex CLI ， ChatGPT 。
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Q1Codex ，？
。ChatGPT ，，Codex 。。
Q2 Codex ？
、。、；、、。 ChatGPT 。
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，。Plus （$20/） GPT-4 。
SEO+GEOFAQ AI ，"Codex "、""。
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OpenAI、ChatGPT、Codex、Flask、GitHub
Reference video/material
Internal link guidance
- Someone has successfully practiced it: a real case of an independent developer using AI coding tools to automate workflow and earning $5,000 per month: Indie Developer: n8n + OpenClaw Automation Workflow Earning $5,000/mo
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