What kind of data or data formatting do you need to fine-tune GPT-4o? I'd love to throw a bunch of documentation at it and let it learn, but I don't have the resources to extract knowledge, format it as questions and answers, etc.
Fine-tuning generally isn't an effective way to add extra knowledge from things documentation - my understanding is that the vast amounts of knowledge in the original training data tend to overwhelm any extra knowledge you try to add by fine-tuning.
Fine tuning is most often performed by training a LoRA. It's almost certainly what OAI are doing, as they can inference many lightweight LoRA in parallel atop the same foundation model.