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How LLMs work

From a single neuron to the chatbots you use: how large language models learn, read text, write answers and run fast.

  1. Neural networksLayers of weighted sums that learn a task from examples · Coming soon
  2. Gradient descentHow a model nudges its weights to get a little less wrong each step · 6 min
  3. BackpropagationHow a network works out which weights caused its error · Coming soon
  4. TokenizationWhy models read text as chunks of words, not letters · Coming soon
  5. Word embeddingsHow words become lists of numbers that capture meaning · Coming soon
  6. AttentionHow each word decides which other words matter to it · Coming soon
  7. TransformersThe layer design behind GPT, Claude and Gemini · Coming soon
  8. Next-token predictionHow a model writes one token at a time, and what temperature does · Coming soon
  9. KV cacheWhy a model doesn't reread the whole chat for every new word · Coming soon
  10. QuantizationShrinking a model's numbers so it fits on smaller hardware · Coming soon
  11. Speculative decodingA small model drafts, the big model checks several words at once · 4 min
  12. Mixture of expertsHuge models that only use a small part of themselves per word · 5 min
  13. Retrieval-augmented generationLetting a model look things up before it answers · Coming soon
  14. RLHFHow human preferences turn a text predictor into a helpful assistant · Coming soon