An LLM is an AI model trained on huge amounts of text. It can understand, write and summarise text and answer questions.
Illustration: AI-generated · AI Compare Ninja · CC BY 4.0
Example
ChatGPT, Claude and Gemini each run on large language models.
For pros
LLMs predict, token by token, which piece of text most likely comes next. Their abilities depend on size, training data and post-training, for example with human feedback.