OpenAI enhances ChatGPT sites with collaboration tools and custom domain support

On September 12, 2026, OpenAI announced enhancements to its ChatGPT Sites platform, introducing a new 'Build Together' collaboration feature that allows users to invite others to co-develop websites or web applications. Previously, the platform was designed for individual use, with projects accessible only by the original creator. The update now enables users to send collaboration requests, allowing invited members to edit, save, and publish content directly. Additionally, users can set projects to private, restricting access to specific individuals for internal testing before public release. The platform now supports viewing connected databases and binding custom domains, enabling users to link their own domains to Sites for more professional sharing. OpenAI also improved the response speed of ChatGPT Sites, reducing deployment time by approximately 50%, which benefits users who frequently test and adjust projects. Developers can now efficiently manage content and database insights without additional tools.