openai アーカイブ

I Thought Codex Could Build a Mahjong Game If I Just Asked

I wanted a free browser mahjong game for friends, so I asked Codex to help build one. The project worked enough to publish, but mahjong exposed the real limit of AI coding: human understanding still matters.

2026.05.26

Coding Tools

How to Use Codex Practically Before Mobile Support Reaches Everyone

OpenAI has brought Codex into the ChatGPT mobile app in preview. Here is how beginners can get a first real Codex win with HTML, JavaScript, Python, and a realistic PC plus phone workflow.

2026.05.15

Coding Tools

GPT-5.5 Prompting Guide: How to Write Outcome-First Prompts for Agents, Tools, and Structured Outputs

A practical GPT-5.5 prompting guide for developers: outcome-first prompts, reasoning effort, tool workflows, structured outputs, prompt caching, and migration examples.

2026.04.30

Coding Tools

Codex GPT-5.5 Guide: What Changed, Who Should Use It, and How to Get ROI

A practical guide to Codex GPT-5.5: what changed, when to use it, when not to, and how to structure coding-agent tasks so the higher cost turns into real engineering output.

2026.04.24

Coding Tools

ChatGPT Images 2.0 Prompt Guide: Practical Prompts for Blogs, Social Posts, Product Images, and Diagrams

A practical ChatGPT Images 2.0 prompt guide with copy-ready prompts for blog covers, diagrams, social images, product visuals, Q&A, tasks, and CTA.

2026.04.23

Tool Reviews

ChatGPTの動画生成AI「Sora 2」とは？できること・使い方・終了予定まで解説【2026年4月最新】

ChatGPTユーザーが知るべきOpenAIの動画生成AI「Sora 2」を、できること、使い方、料金、注意点、2026年の終了予定まで整理。

2026.04.23

Tool Reviews

How to Use Codex in 2026: A Practical Guide to the App, CLI, Skills, and Automations

How to use Codex in 2026: a practical guide to the app, CLI, prompts, skills, AGENTS.md, and automations so it becomes part of your real daily workflow.

2026.04.23

Coding Tools