[chankstein38]

OpenAI allows you to fine tune any of their LLM models. I'm not sure if your requirements were "without paying OpenAI something" but if you are ok with that, fine tuning with them is pretty straightforward. IANAL or anything but if I recall they even promise they won't use your data for their training.

[sebzim4500]

They let you do this with their GPT-3 derived models, but not the GPT-3.5 or GPT-4 ones.

That would be unsafe lol