OpenAI outlines 20-plus ChatGPT, Codex and agent updates at DevDay 2026
OpenAI used DevDay 2026 to unveil more than 20 major announcements spanning ChatGPT, Codex, its models and new ways of working with artificial intelligence. The company described the event as its largest DevDay and said developers can now bring new embedded capabilities directly to a shared ChatGPT audience of 1.2 billion users.
The September 29 announcements focus on agents that can assume ongoing responsibilities, closer collaboration between people and AI, development tools built around Codex and the API, and options to customise ChatGPT with plugins. OpenAI also highlighted additional capabilities available through ChatGPT subscriptions.
ChatGPT positioned as a shared environment
OpenAI said it is opening ChatGPT further as a common environment in which people and agents can work together. In that setting, developers can offer integrated capabilities to the service’s shared user base rather than treating ChatGPT solely as a standalone conversational interface.
The company framed the changes as part of a broader effort to help users devote more time to important work, gain more freedom to turn ideas into reality and pursue tasks that previously appeared out of reach. Its DevDay recap groups the announcements into new ways of working, building with Codex and the API, customising ChatGPT through plugins, collaboration between people and AI, and subscription-related features.
Agents and developer tools take centre stage
Agents are a central element of the update. OpenAI said the newly presented agents can take on continuing duties, signalling a focus on AI systems that support work over time rather than responding only to isolated prompts. The recap does not specify individual agent products or operating details, but places them alongside new approaches to human-AI collaboration.
For builders, Codex and the API are presented as the routes for creating with OpenAI’s technology, while plugins are the route for tailoring the ChatGPT experience. Together, these areas point to a product structure that combines developer-built capabilities, user-facing customisation and ChatGPT as the shared working surface.
What organisations should consider
The DevDay announcements give organisations several product areas to evaluate: persistent agent responsibilities, Codex and API development work, plugin-based ChatGPT customisation, and subscription capabilities. Each area addresses a different way teams may incorporate AI into day-to-day work.
The practical implication for businesses is to identify the specific ongoing tasks, development needs and collaboration scenarios that suit these new capabilities, then define how they will be used within existing workflows before adopting them.