AI glossary

What is Large Language Model?

A neural network trained on huge amounts of text to predict the next token, which lets it write, summarize, answer questions and write code.

LLMs such as GPT, Claude, Gemini and Llama are built on the transformer architecture and trained in stages: pretraining, then instruction and preference tuning. AI engineers usually use them through APIs or as open-weight models rather than training them.

▶Practice it hands-onHow LLMs Are Built (and Why They Hallucinate)

Related terms

Transformer Token Pretraining

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