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AI search guide · ChatGPT

How ChatGPT finds and cites sources.

What OpenAI documents about ChatGPT’s search, which of its crawlers to let in, and what checked studies say it cites.

Zach Chmael

Checked September 30, 2026 · from OpenAI’s documentation and checked studies

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The short answer

ChatGPT, in brief.

Sources

Where it finds sources

Crawlers

The crawlers to know

User agentWhat it doesrobots.txt
OAI-SearchBotSurfaces sites in ChatGPT’s search featuresObeys it. Block it and your pages aren’t shown in ChatGPT’s search answers.
GPTBotCollects content that may be used to train OpenAI’s modelsObeys it. Blocking it opts you out of training, not out of search.
ChatGPT-UserVisits a page when a user’s request needs itMay not apply, since a user started the visit; it doesn’t decide what appears in search.
OAI-AdsBotChecks the landing pages of ads submitted to ChatGPTOpenAI doesn’t say. It only visits pages submitted as ads, and isn’t used for training.
Free toolAI crawler checkerSee what your robots.txt tells OAI-SearchBot, GPTBot, ChatGPT-User and OAI-AdsBot, and the rule behind each.Check your robots.txt 

Citations

What it tends to cite

  1. Vendor study87%+

    More than 87% of ChatGPT search’s citations matched Bing’s top organic results for the same question; 56% matched Google’s.

    A small, early sample, and ChatGPT’s search has changed since.

    Seer Interactive, 87% of SearchGPT Citations Match Bing’s Top Results · Feb 6, 2025

    Over 500 citations from a sample of 100 queries.

  2. Vendor study47% vs 69%

    ChatGPT drew 47% of its citations from company websites, the lowest share of the major engines Profound tracked; on Gemini, company websites made up 69%.

    Company websites here are any company’s own site, competitors’ included, on the prompts Profound tracks.

    Profound, Where do AI citations come from? · Jul 30, 2026

    11.84 billion citations from ChatGPT, Claude, Google AI Mode, AI Overviews, Gemini, Grok, Copilot and Perplexity, across 8,061 active Profound categories, April 16–July 16, 2026.

  3. Vendor study15%

    ChatGPT cited 15% of the pages it retrieved to answer 15,000 prompts, and left 85% uncited.

    AirOps doesn’t say which ChatGPT model it used, or when.

    AirOps, The Influence of Retrieval, Fan-out, and Google SERPs on ChatGPT Citations · Mar 12, 2026

    548,534 pages retrieved for 15,000 prompts, which ChatGPT expanded into 43,233 searches.

Every figure, checked at the source →

Stability

How much its answers change

  1. Vendor study<1 in 100

    Asked for brand recommendations 100 times, ChatGPT and Google’s AI had less than a 1 in 100 chance of giving the same list in any two answers.

    Run with a researcher from Gumshoe.ai, an AI-tracking startup, which SparkToro discloses. Claude repeated itself slightly more often.

    SparkToro, AIs are highly inconsistent when recommending brands or products · Jan 27, 2026

    600 volunteers ran 12 prompts through ChatGPT, Claude and Google’s AI 2,961 times in November and December 2025.

First steps

What to fix first

  1. 01

    Allow OAI-SearchBot in robots.txt, and let OpenAI’s published IP ranges through your CDN or firewall.

  2. 02

    Decide on GPTBot separately: blocking it keeps your content out of training, not out of search.

  3. 03

    Put what matters in the HTML: OAI-SearchBot, ChatGPT-User and GPTBot were among the seven major AI crawlers that didn’t run JavaScript in Vercel and MERJ’s test.

  4. 04

    Fix the pages that return errors: in Vercel and MERJ’s data, ChatGPT spent 34.82% of its fetches on pages that returned a 404.

  5. 05

    Earn mentions off your own site: in AirOps’ B2B test, 85% of brand mentions came from third-party sites.

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FAQ

Questions, answered.

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