OpenAI has taken another step to putting AI-assisted programming in your pocketCodex, their tool designed to work with code and automate technical tasks, can now be used directly from the ChatGPT mobile app on iPhone, iPad and Android devices.
Far from being a mere curious addition, the integration transforms the mobile phone into an advanced remote control For projects that continue running on the computer or on remote servers. For developers, technical teams, and more curious users. Spain and the rest of EuropeThis means being able to follow Codex's work, respond to it, and correct the course without having to be glued to the desk.
What does it mean that Codex is coming to ChatGPT on iPhone, iPad, and Android?
With this update, OpenAI integrates within the ChatGPT app remote access to Codex from iOS and Android. The idea is not for the phone to execute the code, but rather to act as a kind of real-time control panel for what the AI ​​is doing on the main computer.
Codex continues to function as a standalone application on the desktop, especially in Mac and remote environmentsBut now the ChatGPT mobile app lets you join those sessions to see the status of projects, review outputs, approve steps, and adjust instructions. This way, users can keep track of a project while moving between meetings, traveling on public transport, or simply stepping away from their computer.
OpenAI frames this move within its strategy of Strengthen the professional use of ChatGPT in mobile environments.In a context of strong competition in generative AI, bringing software development and automation capabilities to mobile helps ChatGPT become a daily work tool, not just a one-off conversational assistant.
For the average user, this means that, from within the ChatGPT chat itself, they will be able to exchange messages with Codex while he works on the computerwithout having to switch applications or connect to more complex remote desktops.
How Codex works within the ChatGPT app
The key to this new feature is that the smartphone It does not replace the computerCodex continues to run on the laptop, a dedicated Mac mini, or a remote server that the user has configured as a development environment. All the heavy lifting—compiling, running tests, executing scripts, or performing other lengthy tasks—happens there.
From the mobile device, the ChatGPT app connects to those authorized machines and loads the active state of the environmentThis includes information such as threads, running processes, terminal output, test results, desktop screenshots, and code differences generated by Codex. This information is presented in the chat, making conversation with the AI ​​equivalent to managing what's happening on the main machine.
The user can, for example, approve or reject sensitive actions (file deletion, deployments, bulk code changes) from the phone. Before executing anything that could affect the system, Codex displays a confirmation request in the mobile app, where you simply need to accept or qualify the command for it to continue.
In addition to monitoring, the integration allows you to start new jobs and modify parameters on the fly. You can ask Codex to generate a new module, change the AI ​​model for a specific task, or rethink a refactoring strategy—and all of this without needing to return to the desktop at that very moment.
In practice, the phone becomes a remote control screen It receives real-time updates and sends new instructions, but does not store sensitive code or credentials locally.
Security, connection, and real-time synchronization
One of the points that OpenAI wanted to emphasize is the security management. Files, credentials, and permissions They always remain on the machine where Codex is running: the laptop, the Mac mini, or the remote server. The mobile device only receives status and results information, but does not become a repository for sensitive data.
For the connection between devices, OpenAI uses a system of secure retransmission It synchronizes active sessions wherever the user has logged into their ChatGPT account. The mobile app acts as a client that connects to an existing Codex session on the main computer, without directly exposing these systems to the internet.
In many cases, the configuration between Codex and ChatGPT relies on QR codes or equivalent mechanisms which facilitate the connection between your Mac and phone. Simply have Codex running on your computer, open ChatGPT on your mobile device, and follow the steps provided by the interface to establish the connection between the two.
Once linked, the mobile app can display terminal outputs, screenshots, test results, and agent messages so that the user can respond from anywhere. The flow is designed for brief but frequent interactions, avoiding lengthy delays in tasks that require human approval.
This design is especially relevant for European teams working in regulated sectors—finance, health, administration—where data remains on the server or the user's laptop. It reduces friction with internal security policies and regulatory compliance..
Availability, plans and reach in Spain and Europe
The integration of Codex into the ChatGPT mobile app is being rolled out in preview mode for iOS and Android in all supported regions, including Spain and most European countries where ChatGPT is already available.
OpenAI has indicated that mobile access to Codex reaches to all ChatGPT plansFree, Go, Plus, Pro, Business, and Enterprise. There's no specific extra charge for using Codex on your phone; usage is integrated into the token-based billing system the company has been using for these types of tools since spring 2026.
In Spain, ChatGPT Plus users—with an approximate share of 20 per month— users will be able to use Codex on their mobile devices within their plan's data limits. At the Pro, Business, and Enterprise levels, companies have greater usage limits and advanced configuration options, although OpenAI has not publicly detailed differentiated pricing by market.
According to data shared by the company itself and specialized media, more than Four million people use Codex every week.Adoption has reportedly increased fivefold in recent months, largely driven by corporate initiatives. Its arrival on mobile is poised to further accelerate this trend in Europe, where hybrid and remote work remain prevalent.
Regarding platforms, the connection between ChatGPT and Codex already works with the Codex application for macOSSupport for linking to the Codex app on Windows is under development, and OpenAI has announced that it will be activated soon, which will expand the reach to an even larger developer base, including in the European environment.
What can developers and users do from mobile?
The profile most obviously benefiting from this integration is that of software developer which uses Codex to generate, review, or maintain large codebases. With mobile access, you can track the progress of a deployment, answer an AI question, or redirect a task without having to open your laptop.
Among the usual possibilities are review automated test outputsInspect logs, request explanations about changes made by Codex, or adjust quality criteria—all from a conversational interface. The phone thus becomes the control point for validating decisions and resolving bottlenecks.
But its usefulness isn't limited to highly technical profiles. Increasingly, users with less programming experience are taking advantage of the combination of ChatGPT and Codex to Understanding scripts, debugging simple errors, or automating tasks related to online services, office automation, or internal workflows.
For this audience, who already use their mobile phone as primary digital access deviceBeing able to interact with Codex from the ChatGPT app makes it easier to experiment with small projects, review ideas, or launch rapid prototypes without having to sit in front of the computer at that moment.
In business environments, the function is especially useful for distributed or remote teamsTeam members can approve or comment on Codex actions during a meeting, from a train journey or while traveling for work, keeping projects on track with short but constant reviews.
Competitive context and OpenAI strategy
The arrival of Codex on ChatGPT for iPhone, iPad, and Android comes at a time of Intense competition among major AI models and its associated tools. Solutions like Claude Code from Anthropic or proposals from other players in the sector have been expanding their reach, but with more access restrictions in some cases.
OpenAI has chosen to extend Codex to all levels of ChatGPT, and with that, lower the barrier to entry for assisted programmingFor European users, this means having both general conversation and more technical aspects within the same ChatGPT environment, without having to switch between different applications or services.
The company has also been incorporating improvements in their language models —such as those associated with new versions of GPT—, which directly impact the accuracy and context of Codex responses. This translates into more precise code suggestions, a finer understanding of complex environments, and more efficient management of lengthy tasks.
In parallel, OpenAI is working on a unified desktop application that integrates ChatGPT, Codex, and its Atlas browser into a single program. The mobile extension can be seen as the first step in that strategy: allowing users to monitor and manage programming projects from anywhere, but with execution always tied to their local or corporate infrastructure.
All of this takes place, moreover, within a framework where European regulations on AI They are moving forward and demanding greater transparency and control over data. While this mobile integration alone does not resolve that debate, the fact that critical data remains on the server or the user's laptop can help the tool better fit into the compliance policies of companies and public administrations.
The combination of ChatGPT and Codex on mobile paints a picture in which the line between conversational assistant and professional development tool It becomes blurred. OpenAI is betting that users, in Spain and the rest of Europe, can review code, guide AI agents and make technical decisions from the same device they use to manage their email, messaging or daily meetings, bringing AI-assisted programming closer to the daily lives of many more people.
