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"On June 3, 2026, we notified developers usingOpenAI notified developers on 3 June 2026 that Agent Builder thatBuilder, the product visual workflow canvas launched with AgentKit in late 2025, is being deprecated. deprecated and will shut down on 30 November 2026; its deprecations page says ChatKit remains available" On Nov 30, 2026 "Agent Builder is scheduled to shut down" The page directs developers to "Migrate from Agent Builder" in order "to continue with available. The same announcement retired two other products on the same shutdown date: reusable prompt objects (the v1/prompts API) and the Evals platform, which becomes read-only on 31 October 2026 before its dashboard and API close on 30 November. OpenAI points evals users to Promptfoo. OpenAI's recommended paths are the Agents SDK for code-owned workflows or ChatGPT Workspace Agents" Two other products announced the same day, 3 June 2026, share Agents for natural-language use; it also tells developers to migrate prompts into application code rather than prompt objects. Responses API and Agents SDK timelines are unaffected. Export matters: workflows can be exported to Agents SDK code only while the 30 November 2026 shutdown: reusable prompts (the v1/prompts API) dashboard is up, and exports are a starting point rather than a lossless conversion. StackOne notes node configuration, prompts, branching and retry settings port, but OAuth grants, scopes and audit history must be re-authorised, which can take weeks. The ChatKit 'recommended integration', which relied on OpenAI's hosted Agent Builder backend, stops working at shutdown, leaving the Evals platform Deprecation takes effect immediately 'advanced integration' with your own backend. Developers on announcement, OpenAI's community forum voiced frustration at the short product life and every deprecated model floated hosting on AWS Lambda or endpoint is given a shut down date, with "sunset" Cloudflare Workers. Third-party platforms are courting migrators, including Pickaxe, n8n, Zapier, Make and "shut down" used interchangeablyLangGraph, though such vendor comparisons are self-interested.