Being withdrawn on 30 November 2026, so existing users should plan a move to the Agents SDK and newcomers should skip it.
Kenning's take
What it does
Agent Builder is a drag-and-drop canvas on the OpenAI developer platform for wiring together agents, tools and guardrails, with preview runs and version history. It launched in beta in October 2025 as part of AgentKit, alongside ChatKit for embedding chat agents in products. On 3 June 2026 OpenAI said it is winding Agent Builder down, and it will no longer be available from 30 November 2026; OpenAI points users to the Agents SDK or Workspace Agents in ChatGPT instead.
- Visual canvas with drag-and-drop nodes
- Connects tools and custom guardrails
- Preview runs and inline evals
- Full versioning of workflows
- Part of AgentKit with ChatKit and Connector Registry
Who it suits. Developers on the OpenAI platform who built agent workflows visually and now need to plan a move before the shutdown date.
Key facts
- Category
- Developer tools
- Made by
- OpenAI
- Released
- 6 October 2025
- How to get it
- beta on the OpenAI developer platform until 30 November 2026, then withdrawn
- Works on
- Web
- In the UK
- Yes
- API price
- no separate charge; usage billed at standard OpenAI API model prices
FAQ
When was OpenAI Agent Builder released?
OpenAI launched it in beta on 6 October 2025 as part of AgentKit.
Is Agent Builder being shut down?
Yes. OpenAI said on 3 June 2026 that Agent Builder will no longer be available from 30 November 2026.
What should I use instead of Agent Builder?
OpenAI recommends the Agents SDK for workflows kept as code, and Workspace Agents in ChatGPT for prompt-based use.
Facts from the maker's own pages and the sources listed. Checked 2026-10-11.
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