Textbooks Are All You Need II (phi-1.5)
Microsoft's phi-1.5 demonstrates that a 1.3B model trained on "textbook-quality" synthetic data rivals much larger models on reasoning.
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Small but capable: A 1.3B parameter model trained on only 30B tokens competes or outperforms much larger open models on reasoning tasks.
Synthetic textbook data: Training data consists of AI-generated "textbook-quality" content, deliberately curated for pedagogical clarity rather than web breadth.
Data quality dominates: Suggests that data quality and pedagogical structure matter more for reasoning emergence than raw parameter count - a provocative counter to pure-scaling narratives.
Phi-family kickoff: Establishes the recipe that the phi-2, phi-3, and phi-4 releases would refine, popularizing synthetic-data-heavy small LLM training.