OpenAI DevDay 2025: ChatGPT introduces apps, AgentKit for developers, and cost-effective GPT models

The third edition of the DevDay developer conference has been concluded by OpenAI. This year’s conference was a mixed bag, with some new and useful features alongside incremental upgrades, in contrast to last year when OpenAI did not conduct any major product launches. It appears that OpenAI may be working to develop ChatGPT into a fully realized AI-powered operating system. Additionally, the company launched two new, more affordable real-time voice models, a developer toolkit named AgentKit, and introduced apps within ChatGPT. Take a quick glance at all the announcements OpenAI made at DevDay 2025.OpenAI CEO Sam Altman unveiled AgentKit, a robust toolkit aimed at simplifying the creation and implementation of AI agents, in an exciting announcement at the recent Dev Day event. Altman explained, “AgentKit is a comprehensive set of resources on the open AI platform designed to assist developers in moving their agents from initial concept to full-scale production.” This effort forms part of OpenAI’s wider strategy to boost developer engagement by simplifying the process of building agents.

With the introduction of AgentKit, OpenAI demonstrates its dedication to maintaining competitiveness in a fast-changing environment, where numerous AI platforms are working to offer integrated solutions for developing autonomous agents that can manage intricate tasks. A key highlight of the event was the introduction of a feature that allows users to build applications right within ChatGPT, which has recently reached an astonishing 800 million weekly active users.