# Correction for Listing 6.5 in Build a Reasoning Model From Scratch > Source: > Published: 2026-07-25 08:18:12+00:00 # Correction for Listing 6.5 in Build a Reasoning Model From Scratch Thanks everyone for all the kind words and feedback. Super happy that you are enjoying *Build a Reasoning Model (From Scratch)*! Unfortunately, there’s a small typo in Listing 6.5 on page 198 (see the video below). The line `torch.manual_seed(0)` should be `torch.manual_seed(5)` . This is a tiny change, but it’s needed to reproduce the generated response in Listing 6.5 and the corresponding log-probability outputs later in Chapter 6. If you use 0, the code is of course still correct but the numeric results may be a bit different, which could be confusing. Anyway, it should be a small 1 character change :). This will be fixed in the next printing. I am sorry about the oversight, and I hope this note saves you some debugging time. Source: lightly edited website version of my [Substack note](https://substack.com/@rasbt/note/c-301484736). ## Read Next [LLMs From Scratch Reaches 100,000 GitHub Stars Short note celebrating the LLMs-from-scratch repository passing 100,000 GitHub stars and summarizing its learning materials.](/blog/2026/llms-from-scratch-reaches-100000-github-stars.html) [Kimi K3 Architecture Notes Short architecture note on Kimi K3, including LatentMoE, Kimi Delta Attention, Attention Residuals, NoPE, multimodality, and inference-efficiency choices.](/blog/2026/kimi-k3-architecture-notes.html) [A Few Notable Open-Weight Models This Week Short note on the architectures of six new open-weight models, including Nanbeige 4.2, Laguna S 2.1, Motif-3-Beta, Solar Open 2, Antares 1B, and BTL-3.](/blog/2026/notable-open-weight-models-this-week.html)