# What is a large language model (LLM)?

Source: https://cloudbrain.in/glossary/large-language-model
Last updated: 2026-11-10

A large language model (LLM) is an AI model trained on very large amounts of text that can understand and generate language — answering questions, summarising documents and drafting text. LLMs power most of today's AI assistants, so they are the starting point for drafting specifications, RFIs, reports and tender documents in AEC firms.

## Why does a large language model (LLM) matter for architects, engineers and contractors in India?

LLMs power most of today's AI assistants, so they are the starting point for drafting specifications, RFIs, reports and tender documents in AEC firms. Their answers can be confidently wrong, which is why outputs must be checked by a qualified person.

## What is an example of a large language model (LLM)?

A project manager pastes site notes into an approved LLM-based assistant, which drafts a weekly progress report that the manager then checks and edits.

## Where does CloudBrain come in?

Our [custom AI tools and agents](/services/custom-ai) service helps architecture, engineering and construction firms put this into practice. See the related terms below, or browse the full [AEC × AI glossary](/glossary).