Building an LLM from Scratch in TypeScript

A developer is building a ChatGPT-style model from first principles in TypeScript to deeply understand transformers. Chapters so far cover dataloaders, embeddings, and attention.

• LLM ports TypeScript compiler to Rust, costing $420K2026-10-08
• Microsoft agentically ports Copilot runtime to Rust for $120K2026-09-20