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TL;DR
OpenAI began selling a $200 ModRetro Chromatic: Codex Edition on November 9, pairing the retro handheld with a programmable cartridge for games created through its Codex tools. By November 10, the product page said “Restock soon” and listed November 19 as the expected restock date; stock numbers and the date are not confirmed.
OpenAI began selling a $200 ModRetro Chromatic: Codex Edition on November 9, pairing a retro handheld with a programmable game cartridge intended for games made using its Codex coding agent. The product page showed “Restock soon” on November 10 and listed November 19 as the expected restock date, though OpenAI says restock timing can change.
The bundle is sold through OpenAI’s Supply Co. and includes a transparent-shell ModRetro Chromatic, one programmable Codex Cartridge and three AA batteries. The handheld has a 2.56-inch, 160-by-144-pixel backlit display and plays Game Boy, Game Boy Color and Chromatic cartridges. It runs on three AA batteries, with a separate ModRetro rechargeable power accessory also supported.
OpenAI describes a workflow in which users write a game idea in ordinary language, use the ModRetro Chromatic plugin in Codex to develop it, refine scenes and game logic in GB Studio, then build a ROM. That game can be tried in a browser emulator, streamed from a computer to the handheld for testing, or written to the cartridge for play on the device without a computer.
Using the developer mode requires updating the handheld’s firmware, entering the activation code included with the edition, installing the Codex app and adding the plugin. OpenAI’s instructions warn that writing a new ROM erases the game already on the cartridge and may also erase its saves; the installer does not back up the cartridge. A $35 carrying case and a $50 additional Codex Cartridge are listed separately.
ModRetro’s $200 Codex Edition puts AI prompts on cartridges
OpenAI paired a retro handheld with a programmable cartridge for games made using Codex. The bundle connects AI-assisted game creation to play on dedicated hardware.
What buyers get
The bundle combines a handheld, a writable game cartridge and the basics to power it.
Chromatic handheld
Transparent-shell device with a backlit display that plays Game Boy, Game Boy Color and Chromatic cartridges.
Programmable cartridge
One Codex Cartridge lets users put a built game onto the handheld.
Three AA batteries
A carrying case and an extra Codex Cartridge are sold separately.
From idea to handheld game
OpenAI’s described workflow moves from a plain-language concept to a ROM that can run on the cartridge.
Start with an idea written in ordinary language.
Use the ModRetro Chromatic plugin in Codex, then refine scenes and game logic in GB Studio.
Build a ROM to try in a browser emulator, stream to the handheld for testing, or write to the cartridge.
Setup takes more than the cartridge
Using developer mode requires several steps before a Codex-made game can be written to the device.
- Update the handheld firmware and enter the included activation code.
- Install the Codex app and add the ModRetro Chromatic plugin.
- Use GB Studio to refine the game before building its ROM.
Availability and open questions
The listing showed “Restock soon” on November 10, but neither stock levels nor the expected date are guaranteed.
- Expected restock: November 19; timing may change.
- Shipping destinations include the U.S., Canada, Australia, New Zealand, Japan, the U.K. and the EU.
- ModRetro provides warranty and support.
- How many units will be available or whether sales will continue afterward.
- How accessible game creation will be for people new to development.
- What results buyers will achieve; examples do not guarantee game quality.
A Cartridge-Based Showcase for Codex
The bundle gives OpenAI a physical way to demonstrate Codex as a creative tool, not just a coding assistant used on a computer screen. Buyers are asked to install Codex, add a platform-specific plugin and use the software to make a game that can run on dedicated hardware. In practice, the product ties a tangible purchase to repeated use of OpenAI’s development tools.
For retro-game makers, the appeal is a path from a written idea to a game that can be played on a handheld, rather than only viewed in a browser. The bundle’s $200 price and setup steps may limit its audience to enthusiasts willing to experiment. It also raises practical questions about how accessible the process is to people who have not used game-development tools before; the product announcement does not establish how much coding knowledge users will need.
The cartridge approach makes the result portable and playable away from a computer, but it comes with a data risk: flashing a new game can erase existing content and saves. Users will need to manage backups themselves, according to the published warning.
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From DevDay Demo to Retail
OpenAI’s Supply Co. 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 report says ModRetro announced the collaboration on X on September 29, 2026, the day of OpenAI’s developer conference. OpenAI later introduced the sale in its developer forum with the wording “By popular demand.”
The Chromatic is ModRetro’s handheld for Game Boy and Game Boy Color cartridges. ModRetro says its FPGA hardware plays original cartridges “with 100% accuracy”; that is the company’s claim. The Codex bundle is distinct from ModRetro’s standard offerings: on November 10, ModRetro’s store listed a transparent Chromatic with a Tetris cartridge for $149.99, while Supply Co. listed the Codex Edition at $200 with a programmable cartridge and did not mention Tetris.
OpenAI’s developer materials also list 13 games built with Codex for the Chromatic, available to play in a browser or download as ROMs. The product page highlights a tile-matching puzzle, a dungeon crawler and a rhythm game featuring the Codex mascot. These examples show the intended use, but do not independently establish what buyers can make or how quickly they can do it.
“with 100% accuracy”
— ModRetro
Stock, Workflow and Support Details
OpenAI has not disclosed how many Codex Editions were made, how many sold or how many will be available in the next restock. The November 19 date is presented as expected, and the product page says dates may change. The stated shipping markets are the United States, Canada, Australia, New Zealand, Japan, the United Kingdom and the European Union.
The available product information does not say how many units are planned for the restock, whether the bundle will remain available after that, or whether the creation workflow will be suitable for people with no game-development experience. The listing says non-defective items cannot be returned. Warranty and support are provided by ModRetro, not OpenAI, according to the product information.
OpenAI has not supplied independent performance evaluations or evidence that Codex-generated games will meet any particular quality standard. Its examples and descriptions explain the intended workflow, but the results users can achieve may vary.
The November Restock Is the Next Test
The next stated milestone is the expected November 19 restock. OpenAI says the timing may change, so customers will need to check Supply Co. for an updated listing. No further release schedule or sales figures have been announced in the source material.
Attention will also turn to how the Codex plugin and cartridge process work for customers outside OpenAI’s demonstrations: whether setup is straightforward, how reliably games transfer to the handheld and how users can protect saves before flashing a cartridge. OpenAI’s published warning makes that last point especially relevant for anyone planning to replace a game already stored on the cartridge.
Key Questions
What is included in the $200 Codex Edition?
The bundle includes a ModRetro Chromatic handheld, one programmable Codex Cartridge and three AA batteries. A carrying case and an additional cartridge are sold separately.
How do users put a Codex-created game on the handheld?
OpenAI’s described process uses the Codex app and ModRetro Chromatic plugin to help create a game, with GB Studio for refinement. Users build a ROM and can write it to the Codex Cartridge after enabling developer mode.
When will the Codex Edition be back in stock?
On November 10, the Supply Co. page said “Restock soon” and gave November 19 as the expected date. OpenAI says restock dates may change, and it has not disclosed planned stock numbers.
Can installing a new game erase saved data?
Yes. OpenAI warns that writing a new ROM erases the game on the cartridge and can erase its saves. Its installer does not back up the cartridge, so users should take that warning into account before flashing it.
Where does the Codex Edition ship?
The product listing names the United States, Canada, Australia, New Zealand, Japan, the United Kingdom and the European Union as shipping destinations.
Source: ThorstenMeyerAI.com
