OpenAI Unveils Major Codex Upgrades for Developers

OpenAI has announced a significant set of upgrades to its Codex developer tool, aiming to streamline and enhance the coding experience. The announcement, delivered by Romain Huet, Head of Developer Experience at OpenAI, revealed that Codex will now be integrated directly into the ChatGPT application, offering a unified platform for developers. This move consolidates Codex's functionality alongside ChatGPT's conversational AI and a new work agent.

Unified Platform and Enhanced Models

With over six million weekly users, Codex has seen continuous improvement, with more than 150 updates delivered in the past two months. The integration into ChatGPT is a major step, providing developers with a dedicated space within the app. A key highlight of this release is the new GPT-5.6 Sol model, now available to all users. This frontier model is designed to handle complex problems for extended periods. Additionally, the new 'Ultra mode' for GPT-5.6, combined with the 'Goal' command, allows users to tackle more ambitious projects by providing a larger reasoning budget, though it will consume token limits faster.

The full discussion can be found on OpenAI Youtube's YouTube channel.

Automated Task Splitting and App Interaction

Codex can now automatically split work across subagents without explicit user instruction. This allows for parallel processing of tasks, with users able to monitor individual subagents or view the entire team's progress in a dedicated panel. A particularly exciting feature for developers is the enhanced computer and browser interaction. The new 'Appshot' capability, described as a 'smarter screenshot,' captures both the screen and app context. This allows Codex to directly interact with simulators, such as navigating an iPhone app and capturing App Store screenshots in multiple languages, all while the user can continue working on their computer.

In-Browser Development and Deployment

The update also showcases improvements to the in-app browser, enabling developers to work with applications requiring logins, including support for passkeys. A demo showed a simple paper plane game built with GPT-5.6, which could be opened and played within the browser. Developers can now point and click on specific parts of the application to annotate changes, providing visual context for Codex to implement requested modifications. The ability to directly edit code inline within the diff view further enhances this collaborative experience, making it feel akin to pair programming with the AI.

Streamlined Deployment and Project Management

For deploying applications, the 'Sites' feature, previously available for Enterprise users, is now accessible to everyone. This feature supports any web application built with Codex, offering built-in hosting, authentication, a persistent database, and file storage. This allows for a seamless transition from an idea to a full-stack application without the need to manage infrastructure. Codex also introduces improved project management capabilities, allowing the AI to help organize and manage its own tasks. Users can delegate complex tasks, such as finding bugs from a source like Linear, creating separate tasks for each, and pinning critical ones. These tasks can even reference one another, and conversations initiated in ChatGPT can be directly `@mentioned` to bring context into Codex for building.

Enhanced Mobile Experience and Workflow Integration

The ChatGPT mobile experience has also received significant upgrades. Users can now create, search, and manage tasks directly from conversations on their phones. Reviewing changes has been improved with filtering options for staged, unstaged, and branch comparisons. Furthermore, users can connect directly to SSH hosts, like development boxes, to initiate new tasks from their mobile devices. This seamless integration allows for starting work at a desk and continuing it on the go. The desktop workflow has also been refined, with Codex now making it easier to work with pull requests directly within the app. It automatically surfaces open pull requests for tasks and can even fix issues identified by failing checks or comments with full context. The new Pull Requests tab provides a centralized view for exploring code changes, leaving inline comments, and completing reviews without leaving the Codex environment.

Looking Ahead and Community Collaboration

OpenAI emphasizes its commitment to continuously improving Codex for developers, highlighting that this is just a portion of what has been shipped. The company encourages ongoing feedback from its user base. The presentation concluded with an invitation to OpenAI Build Week, an event offering opportunities for developers to connect and explore the latest advancements in AI. The overall message underscores a dedication to empowering developers with increasingly sophisticated and integrated AI tools.