Deprecation notice: Agent Builder

This can’t be true??? The Agent Builder was only released around November last year (2025) and is now being deprecated!

I use the managed agent builder with Chatkit UI, for multiple clients, and migrating to manage the backend myself, makes the use of this tool economically unviable.

Please confirm that this deprecation means that the ChatKit recommended implementation is also not available.

I trust that OpenAI will revise this decision and continue with the Agent Builder and recommended approach for Chatkit implementations.

There are two ways to implement ChatKit:

• Recommended integration. Embed ChatKit in your frontend, customize its look and feel, let OpenAI host and scale the backend from Agent Builder. Requires a development server.
• Advanced integration. Run ChatKit on your own infrastructure. Use the ChatKit Python SDK and connect to any agentic backend. Use widgets to build the frontend.