The model is one component of the product

Large Language Models

LLMs interpret and generate language. They should not be confused with complete search engines, live databases, retrieval systems or autonomous agents.

Published 2026-07-22Last reviewed 2026-07-22Primary-source analysis
Definition

A model trained to work with language

Large Language ModelAn LLM is a model trained on large amounts of language data to predict and generate text and perform language-related tasks.
What the model knows

Parameters are not a live source of truth

Training can encode patterns, associations and factual information in model parameters. The knowledge may be incomplete, stale or difficult to access precisely. A model can also generate plausible language without sufficient evidence.

Products therefore add retrieval, tools, system instructions, safety controls, memory and user context around the model. The resulting application is larger than the LLM itself.

The surrounding system

Five components that change the answer

Prompt and instructions

Define the task, role, constraints and output format.

Context window

Contains the conversation, retrieved passages, tool results and other information available now.

Retriever

Selects outside documents, passages or records for the question.

Tools

Search, calculate, browse, query databases or perform authorized actions.

Interface

Controls citations, links, warnings, memory, personalization and user confirmation.

Why this matters for publishers

You are publishing into retrieval systems, not training a personal model

A public website should not attempt to “speak to the LLM” through hidden instructions or unnatural text. It should publish accurate, accessible evidence that search and retrieval products can discover and interpret.

The model may summarize a small passage rather than the whole page. Clear local context, explicit subjects and nearby limitations reduce the risk of a detached passage becoming misleading.

Evaluation

Fluency is not evidence

Source trail

Primary material behind this analysis

OECD Explanation of the Updated Definition of an AI System

A practical distinction among AI systems, models, inputs, inference, outputs, autonomy and adaptiveness.

Open the original source at OECD.AI →

Retrieval-Augmented Generation for Knowledge-Intensive NLP Tasks

The original RAG paper combining parametric generation with retrieved non-parametric memory.

Open the original source at arXiv →

Related reading

Continue through the discovery stack

OECD Definition of an AI System

An explanation of the OECD AI-system definition and the differences among models, complete systems, inputs, inference, outputs, autonomy and adaptiveness.

Information Retrieval Explained

A practical guide to lexical, semantic, hybrid, graph and structured retrieval, failure modes, passage design and evaluation.