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TL;DR: Llama-Primus-Base is a foundation model based on Llama-3.1-8B-Instruct, continually pre-trained on Primus-Seed (0.2B) and Primus-FineWeb (2.57B). Primus-Seed is a high-quality, manually curated cybersecurity text dataset, while Primus-FineWeb consists of cybersecurity texts filtered from FineWeb, a refined version of Common Crawl. By pretraining on such a large-scale cybersecurity corpus, it achieves a 🚀15.88% improvement in aggregated scores across multiple cybersecurity benchmarks, demonstrating the effectiveness of cybersecurity-specific pretraining.