Earlier quoted context omitted.
Actually the original Phi papers did talk about their synthetic data strategy, and it's very cool -- essentially invert high quality textbook text using GPT-4 to create prompts, where the textbooks supply the answers. There may be more undisclosed, but it remains in my mind as one of the best ideas of the last twelve months -- so smart, and interesting, and apparently, it works well.
Except everything that comes out of an LLM (like GPT4) is highly suspect (at least in my experience).
2. Since GPT-4 is seen as the very best general-purpose LLM in existence, it makes sense to emulate its performance with less resources.
3. Phi models are also trained with other high-quality data