Starting now, anyone can develop their own Gameboy games! OpenAI has officially put the “ModRetro Chromatic: Codex Edition” handheld—previously a promotional giveaway from its collaboration with ModRetro—on sale at Supply Co., OpenAI’s own online store, priced at US$200 (about NT$6,300), with an exclusive rewritable cartridge included in the box. Design levels with Codex, create sprite animations, and play directly on the handheld.
Chromatic: From DevDay Giveaway to Public Sale
This product first appeared at the OpenAI DevDay conference on September 29, 2026 (US time). OpenAI announced a partnership with ModRetro Chromatic and demonstrated a Codex plug-in called “Game Studio.” Attendees could use natural language to develop games for the handheld, test them through a built-in emulator, and then write the finished product to a dedicated cartridge. CEO Sam Altman held up a working physical Chromatic unit at the event, and ModRetro’s official account also posted to confirm that the two sides would combine handheld hardware with the Codex coding agent.
At DevDay, roughly 2,500 attendees were given a transparent-cased limited-edition “DevDay Edition” device on site; these units were not sold publicly. The scarcity immediately spawned a secondary market: the morning after the DevDay keynote, an attendee listed an opened unit on eBay, where it sold for $999.99; two days later another sold for $1,300, while asking prices for unopened units long hovered above $1,000.
Before this OpenAI Developers post, the official account first released a teaser video on November 8 that only said “Tomorrow.” The visuals showed a retro game menu and loading animation, and at the end the OpenAI and ModRetro Chromatic logos appeared together, along with the Supply Co. store and the words November 9. At the time, people were still guessing whether OpenAI was going to make its own gaming hardware.
Tomorrow. https://t.co/ZWapS1LIST
— OpenAI Developers (@OpenAIDevs) November 8, 2026
FPGA hardware validates cartridges, while Codex handles generating games.
The positioning of the Chromatic itself should be clarified first. It is developed by ModRetro, founded by Palmer Luckey, the designer of the Oculus Rift and founder of Oculus VR. Its appearance, resolution, and button layout replicate the Game Boy Color, while internally it uses FPGA circuitry to run physical Game Boy and Game Boy Color cartridges directly in hardware; it does not take the software emulation route at all. The Codex Edition retains the transparent ABS shell and adds Codex integration and a writable cartridge to the same device.
The screen is a 2.56-inch IPS LCD with a resolution of 160×144. ModRetro emphasizes one-to-one pixel mapping with the Game Boy Color LCD, and the panel is covered with Gorilla Glass. Other specs include three AA batteries (with support for a rechargeable Power Core module), a 3.5mm headphone jack, and a custom high-volume speaker. The body measures approximately 132×76×30mm and weighs about 176 grams.
The game development workflow is built on the Game Boy development tool “GB Studio.” Codex generates a project through a dedicated plug-in; users adjust scenes, art, and game logic, then export a ROM, verify it first in a browser emulator on a computer, and then transfer it to the handheld console to play. To play from a cartridge, you first need to update the handheld console’s firmware and enable developer mode; an additional writable cartridge costs US$50 (about NT$1,575), and the activation code can be used on up to two devices. OpenAI’s official website also showcases three sample games made with Codex: the plant-themed puzzle matching game “Seedy’s Sweet Garden,” the dungeon adventure game “Hollow Descent,” and the rhythm game “Codex Dance.”
Regarding the sales window and scope, Supply Co.’s markets include the United States, Canada, Australia, New Zealand, Japan, the United Kingdom, and the European Union. Prices are in USD, and duties and import taxes are calculated separately at checkout based on the destination. The first batch of inventory has sold out, and sales are expected to resume on November 19.
Compared with ModRetro’s own product lineup, the standard Chromatic is priced at US$199.99 (about NT$6,300); the transparent model launched in October is priced at US$149.99 and comes with a Tetris cartridge; the Codex Edition is essentially the transparent model plus Codex integration and a writable cartridge, a price difference of about US$50.
The Next Outlet for Software Agents: Consumer Hardware
For OpenAI, this is a move to test the waters by putting a coding agent into consumers’ hands. At $200, it sits in the affordable range for the handheld console market; the first wave of stock quickly sold out, demand is clearly there, and whether the supply side can keep up remains a challenge. For ModRetro, this layers a new generative AI content-creation experience on top of its existing advantage in retro-console compatibility. From the DevDay attendee giveaway to the official product page at Supply Co., the collaboration completed the transition from showcase to sale in a month and a half. (Editor’s note: Damn, I didn’t manage to get one…)
Ever thought about building your own games? The Codex edition @modretro Chromatic is now on Supply Co. With the ModRetro Chromatic plugin in Codex, you can design levels, animate sprites, and playtest on your handheld. Speedrun checkout while Codex builds your ROM 😉 https://t.co/3OViRHh2Ry
— OpenAI Developers (@OpenAIDevs) November 9, 2026
Source: KOCPC Chinese