Chromatic Codex Edition goes on sale for $200 with a programmable cartridge

OpenAI listed the ModRetro Chromatic: Codex Edition in its Supply Co. store on November 9 for $200, including one programmable game cartridge. Previously introduced as a DevDay exclusive, the handheld returns with a new look.

Shipping for this device is limited to the United States, Canada, Australia, New Zealand, Japan, the United Kingdom and the European Union. South Korea is outside that list, even though it appears in the store’s general shipping guidance. The product-specific FAQ ties the narrower destinations to the electronics safety and compliance testing completed for the device.

The manufacturer’s hardware manual describes a 160-by-144-pixel backlit screen and support for Game Boy, Game Boy Color and Chromatic cartridges. It also identifies a headphone jack, speaker and USB-C video output to a PC. Those details come from an existing May manual, rather than a newly announced hardware revision. Charging through USB-C uses the separately sold rechargeable battery pack.

Game creation takes place on a computer using the Codex desktop app and ModRetro’s plugin. The manufacturer’s quickstart describes turning an idea into a GB Studio project, then changing scenes, characters and artwork while testing a browser preview.

GB Studio’s build documentation separates the editable project from its exports. A ROM export produces a game file for a compatible emulator. A web export creates an HTML5 build that can be hosted on a server, with touch controls available in mobile and tablet browsers. Its scene-selection preview can build only the selected parts of a larger project, letting a developer inspect a changed area before testing the entire game.

From a preview to a physical cartridge

There are three ways to play during development. A browser emulator provides a repeatable preview on the computer. Streaming lets the developer try a computer-run game through the Chromatic’s controls, display and audio. Writing the ROM to a Codex Cartridge makes it possible to play on the handheld without the computer.

Physical cartridge writing requires a firmware update and activation of Developer-Mode for the computer. The quickstart describes entering the included code through the updater. After flashing, it calls for manual checks of booting, gameplay and audio on the device.

An additional Codex Cartridge is listed at $50, with a November 19 restock estimate at the time of checking. It supports .gb and .gbc formats and includes a Developer-Mode activation code. The product page limits the code to two devices and specifies that it is exclusive to the Codex Edition.

The separate protective case costs $35 and carries the same November 19 restock estimate. It has a hard shell, soft lining and space for an extra cartridge. Those accessory listings have their own availability status; the handheld package already includes one programmable cartridge.

OpenAI’s related game collection contains 13 Game Boy Color titles built with Codex. Visitors can play them in a browser or download a ROM for compatible hardware. FlapGPT, Seedy’s Sweet Garden and Hollow Descent are among the listed games. The collection provides examples of finished games; the new retail listing does not establish a new release date for every title in it.

ModRetro handles support and warranty coverage for the device and accessories. Supply Co.’s general policy says in-stock orders typically ship within four business days, with international duties and import taxes calculated at checkout. Sales are final except for damaged, defective or incorrect orders.