GEO glossary
Large language model (LLM)
A large language model (LLM) is a machine-learning model trained on large volumes of text to understand and generate natural language. LLMs power answer engines such as ChatGPT, Gemini and Claude.
Also known as: LLM
LLMs generate answers from patterns learned in training, and increasingly from sources retrieved at query time. What they were trained on and what they can retrieve both shape which brands they name.
Related terms
- Answer engine — A system that returns a synthesised answer instead of links.
- Retrieval-augmented generation (RAG) — Fetching live sources to ground an AI's answer.
- Hallucination — When an AI states something false or unsupported.
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