Glossary
Large Language Model (LLM)
The underlying AI model that powers AI engines — examples include GPT-5, Gemini 3, Claude Sonnet 4.6, and Grok 4.
Definition
An LLM is a neural network trained on massive amounts of text that can generate coherent responses to natural-language prompts. LLMs are the engines beneath the engines: ChatGPT, Claude, Perplexity, Gemini, and Grok are all products built on top of one or more LLMs. Different LLMs have different training data, different knowledge cutoffs, and different recommendation behaviors — which is why your visibility can vary engine-to-engine.
Example
ChatGPT runs on OpenAI's GPT family. Claude is Anthropic's LLM. Perplexity uses a mix including its own and others. Grok is xAI's model.
Related terms
AI Engine
A general term for the AI assistants and answer products that synthesize responses from multiple sources — ChatGPT, Gemini, Claude, Perplexity, Grok.
Generative Engine
An AI system that generates answers (rather than retrieving them), typically powered by an LLM.
Hallucination
When an AI engine states something confidently that is factually wrong — including incorrect details about your brand.
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