AgentKit: Agent Builder, ChatKit and Evals for agents
AgentKit bundles a visual Agent Builder, embeddable ChatKit and agent Evals; OpenAI announced in June 2026 it will wind down Agent Builder and Evals.
Visual canvas for multi-agent workflows with guardrails, an embeddable chat UI, trace grading, datasets, prompt optimization and reinforcement fine-tuning for agents. Per the 2026-06-03 notice, Agent Builder and Evals leave the platform on 2026-11-30 in favor of the Agents SDK.
- Date
- Monday, 6 October 2025
- Lab
- OpenAI
- Kind
- product
- Access
- closed API
Announced at DevDay 2025 alongside GPT-5 Pro, gpt-realtime-mini, gpt-image-1-mini and Sora 2 in the API (changelog 2025-10-06).
Sources
This record was checked against its sources on 6 October 2026. How we check