I built a tiny LLM to demystify how language models work
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Built a ~9M param LLM from scratch to understand how they actually work. Vanilla transformer, 60K synthetic conversations, ~130 lines of PyTorch. Trains in 5 min on a free Colab T4. The fish thinks the meaning of life is food.Fork it and swap the personality for your own character.
HN · launched Apr 6, 2026 · 915 upvotes (top 1%) · 2 views
Niche: large language models · 191 launches, 4 in the last 7 days ▼ -33% · Explore this niche →
Category and tags
- Education
- Developer
- AI-native
- Hobby / open-source project
Visit website ↗ Source listing ↗
More like this: all 191 launches in large language models →
Could you build this?
Yes The project is ~130 lines of PyTorch implementing a standard educational transformer model and training loop on a small synthetic dataset in Google Colab.
Discussion
20 comments analyzed.
Competitors mentioned: LLM from Scratch book, Toki pona translation models
Concerns raised: Unclear value proposition and how it demystifies LLMs, Generic AI chat interface without differentiation, Distillation amplifies artifacts from host model, Insufficient training samples for generating new data
Feature requests: Include codebase documentation context in explanations, Clarify design decisions and abstractions in documentation
Competitors
Other products that read as similar to this one : 525 launches clear the similarity bar, closest 8 shown.
Attention rank: #3 of 526 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 158 days after the earliest competitor.
- Llm-language-learning · github · 2026-09-14 · 14 upvotes · similarity 0.53
- Building an LLM from Scratch in TypeScript · hn · 2026-10-14 · 33 upvotes · similarity 0.52
- Mini-vLLM in ~500 lines of Python · hn · 2025-12-28 · 5 upvotes · similarity 0.51
- Aiaiai.guide: Plain-English mental model for LLM apps, tools and agents · hn · 2026-04-06 · 7 upvotes · similarity 0.50
- LLM Unboxed · ph · 2026-10-20 · 2 upvotes · similarity 0.50
- The Analog I · hn · 2026-01-16 · 29 upvotes · similarity 0.49
- Tiny-vLLM · hn · 2026-05-29 · 205 upvotes · similarity 0.49
- create-llm · github · 2026-10-19 · 11 upvotes · similarity 0.49
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