We made a good video about the differences between n8n, OpenAI, and Inkeep here: https://youtu.be/tRgU5FQoe3s. Short overview.
Re:OpenAI agents builder - there is a hard one-time ejection to code. You can export to their TypeScript or Python SDKs (in some limited use cases), but it's a one-way fork. Their visual canvas is meant to stay visual canvas.
Their SDK is open source -- it's basically for calling the OpenAI APIs downstream. But their visual builder / orchestration layer is not.
inkeep isn't open source with a Elastic License 2.0, why not just go with OpenAI agents sdk (MIT)?