Glossary
LLM (Large Language Model)
A neural-network model trained on large text corpora to generate, summarise, classify and reason over text and code.
Definition
Large Language Models are transformer-based neural networks trained on internet-scale text and code, producing models that can generate human-like text, answer questions, summarise, translate, classify and write code. Commercial LLMs (GPT, Claude, Gemini) are accessed via paid APIs. Open-weights models (Llama, Mistral, Qwen) can be self-hosted. Choosing between them involves trade-offs across cost, latency, capability ceiling, data residency and operational complexity.
Why it matters
LLM choice has direct cost and quality implications. Production LLM products evaluate against golden datasets, fail over between providers, monitor cost per request, and version their prompts the way teams version code.
See also
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