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New book "How Large Language Models Work: Learn by Building One" to be released March 20, 2026

Elith Inc. will publish, through Nikkei BP, "How Large Language Models Work: Learn by Building One" (「作ってわかる大規模言語モデルの仕組み」), a book that lets readers learn the mechanics of large language models (LLMs) by implementing them, on March 20, 2026. Using GPT, the LLM that underlies technologies such as ChatGPT, as a case study, the book systematically explains everything from the fundamentals of the Transformer to the implementation of a GPT model. Using working PyTorch code, readers can understand the structure and training methods of LLMs. It also explains alignment techniques for generating responses aligned with human intent (SFT and DPO), as well as reasoning models such as Chain-of-Thought. It further introduces technologies involved in real-world LLM development, such as distributed training across multiple GPUs

Elith Inc.News & other
New book "How Large Language Models Work: Learn by Building One" to be released March 20, 2026

Elith Inc. will publish, through Nikkei BP, a book that lets readers learn the mechanics of large language models (LLMs) by implementing them, "How Large Language Models Work: Learn by Building One" (「作ってわかる大規模言語モデルの仕組み」), on March 20, 2026.

Using GPT, the LLM that underlies technologies such as ChatGPT, as a case study, the book systematically explains everything from the fundamentals of the Transformer to the implementation of a GPT model. Using working PyTorch code, readers can understand the structure and training methods of LLMs.

It also explains alignment techniques for generating responses aligned with human intent (SFT and DPO), as well as reasoning models such as Chain-of-Thought. It further introduces technologies involved in real-world LLM development, such as distributed training across multiple GPUs.

Through three approaches — intuitive explanations with diagrams, implementation code, and theoretical supplements using formulas — the book offers content that lets readers understand, in a single volume, how modern large language models are built.

■ Book overview