GPT4 is best right now for all the reasons you likely already know. We are working on self-hosted but for right now it is GPT4. We can let you know when we work on self-hosted, which will no doubt come in the future. feel free to email me at anuj at dataherald dot com or sign up on our site (https://www.dataherald.com/contact) and i will keep you posted.

i should note that our (dataherald's) product only sends schema to the LLM, which is important to note.