Definition

AI Overviews

AI Overviews is the AI-generated summary Google places above the classic search results on informational queries, with three to five citation chips. It appears without the user asking for it, on roughly 47% of general informational searches.

Launched broadly in the US in May 2024 and now running in 200+ countries and 40+ languages. Google put the surface at about 2.5 billion monthly users at I/O in May 2026; the figure is Google's own and is not independently verified.

Google announced on 19 May 2026 that AI Overviews and AI Mode will merge into a single AI Search experience; no completion date has been published.

Related terms

AI Mode Citation share Query fan-out

Nostimates measures ai overviews across twelve AI answer surfaces. Request access →

All terms

AEO (Answer Engine Optimisation)GEO (Generative Engine Optimisation)AI Mode Citation share n-sampling Query fan-out Grounding Share of voice (AI)Extraction success rate Surface Answer engine Citation Brand mention Mention rate Confidence interval Statistical significance Citation volatility Non-determinism Reproducibility Identity-free collection Personalisation Locale Residential proxy Bot detection Collection cost Credit Evidence retention Audit trail Parser version Canary prompt Data freshness Cadence Prompt set Head term Long-tail query Competitive set llms.txt robots.txt AI crawler Training crawler Retrieval-augmented generation (RAG)Hallucination Answer box Featured snippet Zero-click search Entity Entity salience Knowledge graph Structured data JSON-LD schema.org FAQ schema Answer-first content Chunk Embedding Semantic search Prompt injection Market coverage Sentiment analysis Position tracking White-label data