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OpenAI began selling a $200 ModRetro Chromatic handheld bundled with a programmable Codex Cartridge on Nov. 9, 2026. The cartridge workflow lets users build Game Boy-style games with Codex and GB Studio, then write them to hardware; the product page showed “Restock soon” on Nov. 10, with Nov. 19 as the expected restock date.
OpenAI began selling the $200 ModRetro Chromatic: Codex Edition on Nov. 9, pairing ModRetro’s Game Boy-compatible handheld with a programmable cartridge intended for games made using OpenAI’s Codex coding agent. The product page showed “Restock soon” the next day and listed Nov. 19 as the expected restock date, though OpenAI says dates may change.
The edition is sold through OpenAI’s Supply Co. shop and comes in a transparent shell with one Codex Cartridge and three AA batteries. The listed hardware includes a 2.56-inch, 160-by-144-pixel IPS display, PBT buttons, a speaker and a headphone jack. The device plays Game Boy and Game Boy Color cartridges as well as Chromatic cartridges. Supply Co. lists the console at $200; a Codex Edition carrying case is $35 and an additional Codex Cartridge is $50.
OpenAI describes a workflow that starts with a plain-language game idea, then uses the ModRetro Chromatic plugin in Codex to create and refine a game in GB Studio. Users can build a ROM, test it in a browser emulator or stream it from a computer to the handheld, and write it to the Codex Cartridge for play on the device. ModRetro’s setup guide says owners need to update the handheld firmware, use an activation code to enable Developer-Mode, install Codex and add the plugin.
OpenAI’s developer blog demonstrates the plugin with a game about a beaver building a lodge. It says Codex can help draw sprite sheets, edit collision maps and run the ROM in an emulator. OpenAI also warns that writing a new ROM erases the existing game on the cartridge and can erase saved games; the installer does not create a backup. The shop listed shipping to the United States, Canada, Australia, New Zealand, Japan, the United Kingdom and the European Union. Its terms say non-defective items cannot be returned, while warranty and support are handled by ModRetro.
A handheld for Codex-made games From prompt to cartridge
OpenAI’s ModRetro Chromatic: Codex Edition pairs a Game Boy-compatible handheld with a programmable cartridge. Users create and test games on a computer, then write them to the cartridge to play on the device.
How the game reaches the handheld
Codex helps build a ROM with GB Studio; the Chromatic plays the game after it is written to the cartridge.
Start with a plain-language idea in Codex.
Use the Chromatic plugin and GB Studio to refine a game, build a ROM, and test it.
Transfer the ROM to the Codex Cartridge and play it on the handheld.
What comes with the edition
The bundle connects a programmable cartridge workflow with familiar handheld hardware.
Ready to start
Transparent Chromatic shell, one Codex Cartridge, and three AA batteries.
Compact screen
A 2.56-inch IPS display with 160-by-144-pixel resolution.
Classic cartridges
Plays Game Boy, Game Boy Color, and Chromatic cartridges.
Before you flash a game
The development steps happen on a computer, and writing a ROM carries a save-data risk.
- Install Codex and add the ModRetro Chromatic plugin.
- Use GB Studio to build and test the ROM.
- Update handheld firmware and enable Developer-Mode.
- Writing a new ROM can erase the existing game and saved games; the installer does not back them up.
A Cartridge-Based Codex Workflow
The sale gives Codex a physical demonstration beyond coding on a computer: users can describe and edit a game, then run it on a dedicated handheld. That makes the product relevant to developers and hobbyists curious about AI-assisted game creation, while the included cartridge creates a direct bridge from generated software to a tangible device.
The practical reach of that idea remains bounded by the workflow. The product page describes using Codex and GB Studio on a computer to create and test a ROM before flashing it; it does not describe the handheld itself as running Codex or generating games. The cartridge-writing warning also matters to anyone with existing saves, since installing a new game can erase them.
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From DevDay Giveaway to Retail
OpenAI’s Supply Co. page says the Codex Edition was first introduced as a DevDay exclusive and is now “back with a new look.” The source article reports that attendees received the earlier version at OpenAI’s developer conference on Sept. 29, 2026, when ModRetro announced the collaboration on X. An OpenAI developer forum post described the retail release as “By popular demand.”
ModRetro’s regular transparent Chromatic, bundled with a Tetris cartridge, was listed at $149.99 on its store on Nov. 10; other Chromatic and Tetris bundles started at $199.99. The Codex Edition listing includes a programmable cartridge and does not mention Tetris. The different bundles make the prices an imperfect comparison, and the available information does not establish how much of the Codex Edition’s price reflects the cartridge or special edition.
OpenAI also says it has published 13 games built with Codex for the Chromatic, available to play in a browser or download as ROMs. The product page spotlights a tile-matching puzzle, a dungeon crawler and a rhythm game featuring the Codex mascot.
Restock and Sales Figures Unknown
OpenAI’s page showed “Restock soon” on Nov. 10 and listed Nov. 19 as the expected date, while warning that restock dates may change. How many units were produced or sold has not been disclosed in the source material. It is also unclear whether the announced date will hold or how quickly additional stock may sell.
The source material does not provide independent testing of ModRetro’s claim that its FPGA hardware plays original cartridges “with 100% accuracy.” It also does not establish how many games users can create with the supplied activation code, beyond the stated limit that the code is for two devices. OpenAI’s product information says the extra cartridge includes an activation code for Developer-Mode; the exact relationship between that code and the included cartridge is not explained in the material provided.
Watch the November Restock
The next listed milestone is the expected Nov. 19 restock on Supply Co. Buyers will need to check the product page for availability because OpenAI says the date may change. The source material does not give a time for the restock or say whether quantities will be limited.
Further details that could clarify the launch include sales or production figures, user access to the cartridge development tools, and whether OpenAI or ModRetro plans to expand the compatible game workflow. For now, the published instructions and demo show how to make and flash ROMs, while the scale of demand and the durability of the restock schedule remain unknown.
Key Questions
What is the ModRetro Chromatic: Codex Edition?
It is a $200 ModRetro Chromatic handheld sold by OpenAI through Supply Co. It comes with one programmable Codex Cartridge and is designed to play Game Boy, Game Boy Color and Chromatic cartridges.
How does Codex work with the handheld?
Users describe a game, work with Codex and the ModRetro Chromatic plugin in GB Studio, build a ROM and test it. They can then write the ROM to the Codex Cartridge and play it on the Chromatic.
When is the next restock expected?
As of Nov. 10, 2026, Supply Co. listed Nov. 19 as the expected restock date. OpenAI says dates may change, and the source material does not give a restock time or quantity.
Can writing a game erase saved data?
Yes. OpenAI warns that writing a new ROM can erase the game on the cartridge and its saves. The installer does not back up the cartridge, so users should account for that risk before flashing a new ROM.
Where does the Codex Edition ship?
The product listing says it ships to the United States, Canada, Australia, New Zealand, Japan, the United Kingdom and the European Union.
Source: Thorsten Meyer AI
