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【0-1 Beginner's Guide to Using Codex for Programming】
Just manually created a website aggregating AI / Web3 information sources. As a non-technical beginner, my biggest confusion wasn't the vibe coding process, but rather not being able to find the entry point at first. This post will step by step organize how to use Codex for programming.
1. What is Codex? Codex is a series of AI coding tools from OpenAI. By delegating tasks to cloud and local coding agents, it helps developers develop faster and deliver quicker.
2. Download Codex. For this step, you need to install it in your IDE, such as VS / Cursor, etc. I chose VS Code. Open VS, click the extension button on the left menu bar, search for Codex, and install it.
3. Launch Codex. After installation, the familiar OpenAI logo will appear in the left menu bar. Click to enter programming. Before entering any dialogue, Codex requires you to create a folder. Select 【File】 - 【New File...】 - Name it. Now your coding folder is ready, and you can input your requirements.
4. Understand Codex. The buttons at the bottom of the dialogue box need to be understood. Commonly used are Switch Mode, Chat (used for initial requirement clarification and PRD discussions with AI), and Agent (used during actual coding). Select Mode defaults to GPT5.2-Codex paired with Medium reasoning, depending on the level of product you need to build.
You can also use multiple tools to complete tasks, such as delegating front-end design to Gemini 3 and coding to Codex. Overall, in conversations with AI, continuously learning the overall product thinking is more important than just coding.