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Language Model Builder

Free hands-on app that teaches building a language model from scratch in hours to days. Critics note a crash in chapter 1's 'under the hood' link.

Summarized from 8 comments.

Free hands-on app that teaches building a language model from scratch in hours to days. Critics note a crash in chapter 1's 'under the hood' link.

recommend
7
criticize
1
months recommended
2 of 13

Why people love it

What people warn about

  • Chapter 1 'under the hood' link crashes · 1

    in chapter 1, the "under the hood" link crashes the app

    Jul 2026 · comment

What hackers pick instead

Every quote

The 7 most detailed of 8 comments. Each links to the original.

  1. Man, this is excellent! thank you so much for sharing this for free

    Recommends · Aug 2026 · in “I were 17, I'd learn how to build LLMs from scratch”

  2. in chapter 1, the "under the hood" link crashes the app

    Mixed · Jul 2026 · in “Show HN: Language Model Builder (an app to learn about and build models)”

  3. This is the coolest link I saw on HN the last 2 months.

    Recommends · Aug 2026 · in “I were 17, I'd learn how to build LLMs from scratch”

  4. Beautiful work! What prompted you to build this?

    Recommends · Aug 2026 · in “I were 17, I'd learn how to build LLMs from scratch”

  5. This is great, thank you!

    Recommends · Aug 2026 · in “I were 17, I'd learn how to build LLMs from scratch”

  6. the datavis here and type hinting (even if it's just default swiftmath) is really nice.

    Recommends · Jul 2026 · in “Show HN: Language Model Builder (an app to learn about and build models)”

  7. teaches you (in a few hours to days) how to build an LLM from scratch

    Recommends · Aug 2026 · in “I were 17, I'd learn how to build LLMs from scratch”

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