AI citation (cross-LLM)
AI citation is the inclusion of a website's content (with source attribution) in the response of an AI assistant — ChatGPT search, Perplexity, Claude with web access, Gemini, Bing Copilot. Citation in AI responses is increasingly the goal of content marketing in 2024-2026, replacing or supplementing traditional organic search rankings.
Different AI surfaces cite content differently: Perplexity surfaces source URLs inline; ChatGPT browsing surfaces them in a sidebar; Google AI Overview embeds source links in the answer; Claude with tool use cites in its written response. The optimisation patterns converge: provide content the AI can read confidently (clear, definition-led, factually dense), make it machine-accessible (clean HTML, llms-full.txt, schema.org markup), and demonstrate authority (original research, primary sources, backlinks). Tracking AI citation share is harder than tracking organic ranking because most AI APIs don't expose query logs — operators typically use a query template set checked weekly.
Related terms
- AI Overview (Google SERP)
AI Overview is the LLM-generated answer that Google shows at the top of search results for many queries — synthesising information from multiple sources and citing them inline.
- Semantic search
Semantic search retrieves documents based on meaning rather than keyword overlap — using embedding vectors and similarity scoring to match queries to documents that express the same concept in different words.
- Grounding (LLM)
Grounding provides an LLM with authoritative context — retrieved documents, structured data, real-time API responses — and instructs it to base its response on that context rather than its pre-trained knowledge.