According to Andrej Karpathy (@karpathy), exploring what constitutes 'highest grade' pretraining data for large language model (LLM) training—when prioritizing absolute quality over quantity—raises key questions about optimal data sources. Karpathy suggests that structured, textbook-like content or curated outputs from advanced models could offer superior training material for LLMs, enhancing factual accuracy and reasoning abilities (Source: Twitter, June 20, 2025). This focus on high-quality, well-formatted data streams, such as markdown textbooks or expert-generated samples, presents a notable business opportunity for content curation platforms, academic publishers, and AI firms aiming to differentiate models through premium pretraining datasets. The trend spotlights the growing demand for specialized data pipelines and partnerships with educational content providers to optimize model performance for enterprise and education applications.