Understanding Reasoning LLMs

Sebastian Raschka's deep-dive covers the four main approaches to building reasoning models, the methodology behind DeepSeek R1, and practical tips for developing reasoning models on a budget. The article contextualizes reasoning models as a Stage 4 LLM specialization—useful for math, coding, and multi-step problem solving—while also discussing their drawbacks. Solid technical grounding for engineers navigating the post-DeepSeek landscape.