View custom GPTs made in the web app via API

I would love for the ability to programmatically update Knowledge files in my Gizmo (custom GPT), the reason being that I want to set up automation that retrieves the latest data for these files so that the knowledge base for that GPT is always fresh.

However, when I attempted to use the assistant API I can only see data for assistants that were created in the OpenAI Playground. Does anyone know if there is a plan to expose Custom GPTs to the OpenAI APIs at any point?