Sebastian Raschka • 6/30/2026

Build a Reasoning Model From Scratch Is Out

This article announces the publication of 'Build a Reasoning Model (From Scratch)', a sequel to 'Build a Large Language Model (From Scratch)'. The author describes the book as a 440-page full-color guide that walks readers through implementing modern reasoning techniques from scratch on a small Qwen3 base model. Topics covered include inference scaling, reinforcement learning, and distillation. The book is now shipping from the publisher and available for preorder on Amazon. It targets engineers and enthusiasts interested in understanding how reasoning models power modern AI agents.

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#large language models #Reinforcement Learning #Reasoning Models