Codex just shipped an update that closes the loop on AI-assisted development.

In this Short I'm walking through the two features that changed how I think about the tool. First, the in-app browser. I asked Codex to build a small co-op puzzle game and run it locally. It wrote the code, opened the game in its own browser, and then played it with me. Reading the page state, clicking buttons in the UI it just built, moving its character alongside mine.

Same capability outside the browser is called Computer Use. Codex can see your screen, move its own cursor, and operate any Mac app. Native app testing, GUI bug reproduction, any app your code depends on.

The bottleneck in AI-assisted development was never writing the code. It was verifying it. Codex just handled that part.

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TechWithTim, founded by Tim Ruscica, is a popular YouTube channel and blog offering tutorials, guides, and projects on programming, game development, and machine learning. With a friendly and approachable teaching style, Tim covers a wide range of topics, including Python programming, game development with Pygame, and machine learning algorithms with TensorFlow and Keras. Developers of all skill levels can benefit from TechWithTim's engaging content and hands-on coding projects, making it an in resource for learning and honing technical skills.

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OpenAI's Codex has shipped a major update enabling it to operate user interfaces, not just write code. It can now build a game, spin up a server, open it in a browser, and then actually play it alongside you by clicking UI elements and reading page state. Beyond the browser, Codex also supports computer use on Mac — moving a cursor, clicking through native apps, opening Spotify, playing Tic-Tac-Toe — making it useful for native app testing and reproducing GUI-only bugs. The key insight: the bottleneck in AI-assisted development was never code generation but verification. Codex now closes that loop by building, testing, and verifying its own work autonomously.

Codex Built a Game and Then Played It With Me