Learning · online tutorial
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
Praised as excellent and cool · 4
Man, this is excellent! thank you so much for sharing this for free
Aug 2026 · commentThis is the coolest link I saw on HN the last 2 months.
Aug 2026 · commentBeautiful work! What prompted you to build this?
Aug 2026 · comment
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
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Every quote
The 7 most detailed of 8 comments. Each links to the original.
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”
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)”
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”
Beautiful work! What prompted you to build this?
Recommends · Aug 2026 · in “I were 17, I'd learn how to build LLMs from scratch”
This is great, thank you!
Recommends · Aug 2026 · in “I were 17, I'd learn how to build LLMs from scratch”
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)”
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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