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OpenAI put the ModRetro Chromatic: Codex Edition on sale for $200 on Nov. 9, 2026, with a programmable cartridge for games created using Codex and GB Studio. The Supply Co. page showed “Restock soon” on Nov. 10 and listed Nov. 19 as the expected restock date; sales and inventory figures have not been disclosed.
The package is a transparent-shell ModRetro Chromatic handheld, one programmable “Codex Cartridge” and three AA batteries. The listed specifications include a 2.56-inch, 160-by-144-pixel IPS display, PBT buttons, a headphone jack and compatibility with Game Boy and Game Boy Color cartridges. The device can also use ModRetro’s rechargeable Power Core, sold separately.
OpenAI describes the software process as moving from a plain-language game idea to a playable ROM. Users add the ModRetro Chromatic plugin in Codex, then use Codex with GB Studio, a visual editor for Game Boy games, to develop and refine scenes, artwork and game logic. They can test the result in a browser emulator, stream it from a computer to the handheld, or write it to the cartridge.
Getting started requires updating the handheld’s firmware, entering an activation code to unlock Developer-Mode, installing the Codex app and adding the plugin. The plugin includes “Wrecklight,” an example game that users can remix. OpenAI’s developer walkthrough shows a prompt about a beaver cutting trees to build a lodge, with Codex helping create sprite sheets, edit collision maps and run the game in an emulator.
Prompts become playable games with the Codex Edition
OpenAI’s $200 handheld pairs Codex and GB Studio with a programmable cartridge, giving hobbyists a route from a game idea to a game they can play and share.
From idea to cartridge
The workflow combines Codex with GB Studio to build, refine and play retro-style games.
Start with a plain-language idea; Codex can help create artwork and game logic.
Use the visual editor to develop scenes, sprites and collision maps.
Try the game in a browser emulator, stream it to the handheld or write its ROM to the cartridge.
What buyers get
A ready-to-play handheld
The package includes a transparent-shell Chromatic, one programmable Codex Cartridge and three AA batteries.
Built for classic games
It has a 2.56-inch IPS display and works with Game Boy and Game Boy Color cartridges.
Optional accessories
A Codex Edition carrying case and extra cartridge are sold separately; the rechargeable Power Core is also separate.
Before you write a ROM
- Updated handheld firmware and Developer-Mode activation
- Codex app, Chromatic plugin and GB Studio
- A compatible game ROM to test or write
- Writing a new ROM can erase the existing game and saves
- The installer does not back up the cartridge
- Restock timing and inventory are not guaranteed
Availability and open questions
A Cartridge for Codex-Built Games
The announcement makes OpenAI’s coding tools part of a physical play-and-build product: a user can generate or edit a game, then run it on a handheld without keeping a computer connected. That gives the company a tangible way to demonstrate what Codex can do, while offering hobbyists a route from a prompt to a game they can hold and share.
The product also depends on more than AI-generated code. Buyers need the Chromatic, its developer mode, Codex, the plugin and GB Studio to follow the advertised workflow. The announcement describes a specialized entry point for retro game creation; it does not establish how easy the process is for beginners or how many buyers will use the cartridge after purchase.
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From DevDay to Supply Co.
OpenAI’s product page says the Codex Edition was first introduced as a DevDay exclusive and describes the retail version as returning with a new look. The source material says GIGAZINE reported that the earlier edition was given to attendees at OpenAI’s developer conference on Sept. 29, 2026, the day ModRetro announced the collaboration on X. An OpenAI developer forum post introduced the retail sale with the phrase “By popular demand.”
Supply Co., OpenAI’s merchandise shop, lists the handheld at $200. The source material says ModRetro’s store listed a transparent Chromatic bundled with a Tetris cartridge for $149.99 on Nov. 10, while other Chromatic and Tetris bundles started at $199.99. The Supply Co. listing describes a programmable cartridge in the box and does not mention Tetris.
OpenAI also lists a Codex Edition carrying case for $35 and an additional Codex Cartridge for $50, sold separately through Supply Co. The extra cartridge includes an activation code for Chromatic Developer-Mode, which the listing says is limited to two devices and exclusive to the Codex Edition.
Inventory and Cartridge Risks
OpenAI has not disclosed how many units were made or sold. The Nov. 19 restock date is presented as expected, and the product page says dates may change, so availability on that day is not certain. The available material also does not establish how long the cartridge activation codes remain valid or whether the two-device limit can be changed.
Users should also account for the stated data risk: writing a new ROM can erase the existing game and may erase saves, while the installer does not create a backup. The source material does not explain whether a separate backup method is available.
Watch for the Listed Restock
The next stated milestone is the expected Nov. 19 restock on Supply Co. Buyers will need to check the listing for availability because OpenAI says the date may change. The product page lists shipping to the United States, Canada, Australia, New Zealand, Japan, the United Kingdom and the European Union.
OpenAI has published 13 Codex-built Chromatic games as browser-playable titles or downloadable ROMs, with a tile-matching puzzle, a dungeon crawler and a rhythm game among those highlighted on the product page. Further sales or product details could clarify demand and supply, but no additional figures are provided in the source material.
Key Questions
What is the ModRetro Chromatic: Codex Edition?
It is a $200 ModRetro Chromatic handheld sold by OpenAI’s Supply Co. with one programmable Codex Cartridge for playing compatible games.
How do Codex prompts become playable games?
Users add the Chromatic plugin to Codex, develop or refine a game with GB Studio, export a ROM and test it in an emulator or on the handheld. They can then write the ROM to the Codex Cartridge.
When will the handheld be available again?
Supply Co. showed “Restock soon” on Nov. 10, 2026, with Nov. 19 listed as the expected restock date. OpenAI says dates may change.
Can writing a game erase data on the cartridge?
Yes. OpenAI warns that writing a new ROM erases the game already on the cartridge and can erase its saves. The installer does not back up the cartridge.
Source: Thorsten Meyer AI
