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AI platform features change quickly. This article describes what was verified on the date of the last update. Check the provider's current documentation before making an implementation decision.
When OpenAI launched ChatGPT Search in late 2024, many marketers dismissed it. That was a mistake. Within six months it became one of the fastest-growing search channels. Unlike the classic ChatGPT, which relies on training data that can be months or years old, ChatGPT Search browses the web in real time, cites specific pages and behaves like a next-generation search engine.
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ChatGPT Search has been available to all ChatGPT users, including free accounts, since early 2025. A substantial share of users now rely on it to research products, services and companies.
How does ChatGPT Search differ from classic ChatGPT?
| Attribute | ChatGPT (no web search) | ChatGPT Search |
|---|---|---|
| Data source | Training data up to a cut-off | The live web |
| Source citation | Rarely, without links | Always - links to pages shown alongside |
| Data freshness | Historical | Current, from the last hours or days |
| What matters for companies | Presence in the training data | The site and content available online |
| How to enable it | Default (old mode) | The globe icon in the chat bar |
| Who can use it | Everyone | Everyone, free and paid |
The key difference for companies: in classic ChatGPT your company exists in the AI's knowledge because of what was written about it before the training cut-off. In ChatGPT Search your company is visible because of what is on your site and what others write about you now, in real time. That is a fundamental change in the logic of optimisation.
How does ChatGPT Search choose sources?
ChatGPT Search uses its own crawler, GPTBot, to index web pages. OpenAI has not fully disclosed the source-selection algorithm, but observation and testing point to several key factors:
- Content relevance - whether the page answers the user's question directly. ChatGPT Search favours pages with a specific, unambiguous answer.
- Freshness - it actively favours new content. Articles with a current publication or update date have an advantage.
- Page structure - content with H1, H2 and H3 headings, lists and tables is easier to parse and cited more often.
- Crawler accessibility - check that GPTBot is not blocked in robots.txt. Many companies block it inadvertently along with other bots.
- Domain authority - as with Google, ChatGPT Search favours more credible sites. Links and mentions from external sources help.
- llms.txt - a file telling AI systems how to index your site. Sites with a well-configured llms.txt have an advantage.
How to check whether GPTBot can reach your site
The first optimisation step is verifying that OpenAI can index your site at all. Check robots.txt on your domain by opening yourdomain.com/robots.txt and looking for GPTBot entries:
- User-agent: GPTBot / Disallow: / - BLOCKS all OpenAI bots, including ChatGPT Search. Remove this rule if you want to be indexed.
- User-agent: * / Disallow: / - BLOCKS all bots, including GPTBot. Check whether that is intended.
- User-agent: GPTBot / Allow: / - permits indexing. Good.
- No GPTBot entry - GPTBot has access by default. Fine.
Many companies implemented a blanket AI bot block in 2023 in response to scraping concerns. Now that ChatGPT Search has become a key visibility channel, that block can cost you citations. Consider unblocking GPTBot and OAI-SearchBot, the crawler ChatGPT Search uses.
Five actions that improve visibility in ChatGPT Search
- 1Unblock GPTBot and OAI-SearchBot in robots.txt - a necessary condition. Without it, ChatGPT Search cannot index your site.
- 2Add or update an llms.txt - point AI systems to your most important pages, their purpose and how to interpret the content. Sites with llms.txt are understood better.
- 3Create content that answers specific questions - every page or article should answer one question unambiguously. The format: question as an H2, answer in the first paragraph, detail below.
- 4Add an update date to every page - ChatGPT Search favours fresh content. If you update an article, mark it visibly.
- 5Build external mentions in real time - industry articles, media citations and active profiles on platforms ChatGPT indexes all increase the odds of appearing as a recommendation.
What ChatGPT Search indexes
Testing ChatGPT Search on B2B queries reveals several patterns. Indexing quality is uneven - pages with substantial content and regular updates are cited more often. Industry publications appear frequently as sources. Companies with their own blog and regular publishing have an advantage over companies with no content.
An important observation: for queries in languages other than English, ChatGPT Search often cites both local and English sources - particularly where there is little local content on the topic. That means, for niche B2B topics, a company with good English content can hold an advantage over firms publishing only in their local language.
How to measure visibility in ChatGPT Search
Measuring visibility in ChatGPT Search is harder than in Perplexity, which shows clear citations as a source list. In ChatGPT Search, source links appear in a side panel and do not always reflect every source used. Measurement methods:
- Manual tests - regularly ask 20 to 30 category questions with ChatGPT Search enabled and check whether your site appears in the source panel.
- Traffic analysis - create a referral traffic segment and check whether traffic appears from chatgpt.com, since ChatGPT Search sends users to full articles.
- Tools - Rankscale and Scrunch AI have dedicated modules for tracking ChatGPT Search citations.
- Mention monitoring - tools that track when your site is cited online indirectly indicate content popularity among AI tools.
ChatGPT Search or Perplexity - where to focus?
Clients often ask: with limited resources, where should optimisation focus - ChatGPT Search or Perplexity? The answer depends on your audience. Perplexity is more popular among technical users, start-ups and IT professionals. ChatGPT Search has a wider user base; after being opened to free users, the number of people using it for search rose several times over.
The good news: most optimisation work serves both platforms at once. A good llms.txt, accessibility to AI crawlers, structured content and fresh dates all help in ChatGPT Search and in Perplexity. You do not have to choose - do what is good for both.
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Frequently asked questions
What is ChatGPT Search?
ChatGPT Search is a search mode within ChatGPT with real-time web access. Unlike the classic ChatGPT, which relies on training data, it browses the web continuously, cites sources and provides links - much like Perplexity. It has been available to all ChatGPT users, free and paid, since 2025.
How do I check whether my site appears in ChatGPT Search?
Open ChatGPT and enable search mode with the globe icon. Ask 10 to 20 questions your buyers might ask when looking for a service in your category. Check the side panel to see whether your site appears as a cited source. Repeat on different days and record the results.
Is GPTBot blocked on my site?
Check robots.txt on your domain. If you find "User-agent: GPTBot" with "Disallow: /", or "User-agent: *" with "Disallow: /", OpenAI's bots are blocked. Remove or change those rules so ChatGPT Search can index your site.
How does ChatGPT Search differ from Google?
ChatGPT Search gives one synthesised answer with a handful of cited sources rather than a list of ten links. Users click through less often and read the answer instead. For companies that means being cited, not merely ranking, is decisive. ChatGPT Search does not use PageRank - it favours content that answers the question directly.