What is LLM (language model)?

An LLM (large language model) is an AI model trained to understand and produce text.

LLM stands for large language model. It is trained on enormous amounts of text and is therefore good with language: writing, summarizing, translating, answering questions. ChatGPT, Copilot and Gemini all run on an LLM. It keeps guessing the most likely next piece of text.

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Last reviewed: 19 June 2026.