OpenAI winds down Agent Builder and Evals as Frontier becomes its enterprise agent platform

OpenAI·low signal

A June 2026 update confirms OpenAI is sunsetting the AgentKit Agent Builder and Evals products, which will be unavailable on the platform from November 30, 2026, while positioning OpenAI Frontier — its end-to-end enterprise platform for building, deploying and governing agents with shared context, permissions and onboarding (customers include HP, Oracle, State Farm, Uber) — as the go-forward path. OpenAI says Frontier does not replace the Agents SDK or remaining APIs. Teams that built on Agent Builder need a migration plan.