What is ChatGPT Search?
OpenAI's web-grounded search experience inside ChatGPT — the largest single source of AI referral traffic to websites.
Definition
ChatGPT Search is OpenAI's web-connected answering mode: ChatGPT issues live searches (via its OAI-SearchBot crawler and search partnerships), retrieves pages, and composes a cited answer. Estimates put it at hundreds of millions of queries per week, and multiple 2026 measurement firms report ChatGPT driving the large majority of AI referral traffic — Conductor pegs it near 87% of AI referrals on average, though its share is eroding as Gemini grows.
Why it matters
For most brands, ChatGPT is where AI visibility concentrates: it's the default research assistant for consumers and — per G2's 2026 research — the starting point for about half of B2B software buyers. Similarweb clickstream data puts ChatGPT referral conversion at 7.1%, second only to paid search. If you optimize for one assistant first, this is the one — while watching Gemini's rising share.
Frequently asked
How does ChatGPT choose what to cite?
It runs one or more background searches, retrieves candidate pages, and selects passages that directly answer the question from sources it treats as credible — favoring corroborated claims, clear structure, and parseable HTML.
Is ChatGPT Search traffic visible in analytics?
Yes — human click-throughs arrive with a chatgpt.com referrer. What stays invisible is everything upstream: the prompts asked, the answers given, and the mentions you did or didn't get. That layer requires prompt tracking.
Related terms
- AI CitationsThe linked sources an AI assistant credits when generating an answer. Being cited is the AI-era equivalent of ranking #1.
- CrawlabilityHow easily bots can access, fetch, and parse a site's content. The technical foundation of both SEO and AI visibility.
- AI CrawlerBots operated by AI companies — GPTBot, ClaudeBot, PerplexityBot, Google-Extended — that fetch web content for model training or live answer retrieval.
- AI OverviewsGoogle's AI-generated summaries shown above traditional results, now appearing on roughly half of searches and dramatically reducing clicks to websites.