Reasoning Models From Scratch: Code Setup

Sebastian Raschka published a video and accompanying note explaining how to set up the Python and PyTorch environment for building a reasoning model from scratch, using the `uv` package manager. The video clarifies the relationship between conventional LLMs, reasoning models, and agents, and discusses the philosophy of 'from scratch' approaches. It is part of a series on building reasoning models from scratch.

Reasoning Models From Scratch: Code Setup A little video that - explains the relationship between conventional LLMs and reasoning models and agents , - philosophizes about “from scratch” approaches, - and explains how to install the Python and PyTorch requirements with uv . The video is here: Build A Reasoning Model From Scratch 1: Motivation & Code Setup https://www.youtube.com/watch?v=Kh9mqTzjuEQ . Source: website version of my Substack note https://substack.com/@rasbt/note/c-325854620 . Read Next Two Live Book Club Q&As on September 3 Two free live book club Q&A sessions on September 3 about Build a Reasoning Model From Scratch and related reader questions. /blog/2026/reasoning-model-book-club-q-and-a.html GLM-5.3-Flash Architecture Notes Architecture note on GLM-5.3-Flash, formerly Ox Alpha, covering its KDA and MLA/DSA hybrid attention, sparse MoE backbone, and four-stream mHC residual pat /blog/2026/glm-5-3-flash-architecture-notes.html How Claude's Text Watermarking Works Short illustration of how Claude's text watermarking is supposed to work based on Anthropic's released materials. /blog/2026/claude-text-watermarking.html