OpenAI just released GPT-5.4, and one of the standout moments in the announcement is a game. Among the demos showcasing the model's new capabilities is a fully playable turn-based tactical RPG built with Phaser, available to try right now in the browser.
A Tactical RPG Built with Phaser and GPT-5.4
The demo is a tactical RPG featuring turn-based combat on a grid map, with systems for movement, actions, positioning, and encounter flow. It was built using GPT-5.4 and Codex, with Playwright Interactive handling browser playtesting and image generation producing the characters and visual assets.
The game was developed iteratively over multiple turns, with the AI writing code, testing it in the browser, and refining the UI, combat systems, and visual style in a continuous loop. The result runs in the browser and is built on Phaser.
What GPT-5.4 Means for Phaser Game Developers
When OpenAI set out to demonstrate GPT-5.4's coding capabilities, they built a game with Phaser. For developers already working with the framework, it is a useful reference point for what AI-assisted game development can produce today.
GPT-5.4 is available via the OpenAI API as gpt-5.4, and Codex is the recommended environment for longer coding tasks.
Try It Now
You can try the full demo using the button below.