On October 6, 2025, during the OpenAI Developer Day event, CEO Sam Altman unveiled four significant updates. Firstly, the introduction of the Apps SDK allows developers to craft interactive applications directly within ChatGPT. This means users can access these applications seamlessly without the need to switch platforms, thereby solidifying ChatGPT's position as the 'ultimate operating system gateway'. Secondly, the launch of AgentKit streamlines the creation of AI agents through an intuitive visual interface, enabling developers to design and deploy agents in a mere 8 minutes. Thirdly, the official rollout of the no-code Codex programming assistant empowers developers to utilize natural language commands, dramatically boosting development efficiency. Lastly, the API has been expanded with the addition of three new models: GPT-5 Pro, gpt-realtime-mini, and Sora 2, all aimed at enhancing processing capabilities. Recent data indicates that ChatGPT boasts over 800 million weekly active users, 4 million developers, and has achieved unprecedented levels of API traffic.