ChatGPT SEO vs Google SEO: What Actually Changes

Our GEO vs SEO guide covers the general shift from ranking in search results to being mentioned in AI answers, across ChatGPT, Gemini, Perplexity and Google AI Mode. This page is narrower. It puts ChatGPT next to Google Search and asks one practical question: if you already do basic SEO for Google, what do you need to do differently for ChatGPT?

The honest answer is: less than the market noise suggests. ChatGPT search reads public web pages, just as Google does. Pages that are crawlable, fast, clearly written and mentioned by other sites do well in both. The differences below are real, but they sit on top of the same foundation. Where each one fits in a ChatGPT plan is shown on the ChatGPT SEO overview.

Google Search uses Googlebot. ChatGPT search uses OAI-SearchBot, a different user agent with its own robots.txt rule. OpenAI states that sites opted out of OAI-SearchBot will not be shown in ChatGPT search answers, and that a robots.txt change can take about a day to take effect. OpenAI runs two more bots, GPTBot for training and ChatGPT-User for pages a user asks ChatGPT to open, each controlled separately. What each OpenAI bot does has the full comparison and the rules to copy.

Allowing Googlebot does not allow OAI-SearchBot. If your robots.txt names Googlebot and has a strict rule for everyone else under User-agent: *, ChatGPT's crawler falls under the strict rule. The same applies to firewall and CDN bot settings, which often treat AI crawlers differently from Google. AI crawlers and robots.txt shows how to check both layers.

Mostly, yes. On 2026-11-09 we read the robots.txt of 61 hosts: the 59 domains cited most in our 2026-10-25 tracker round of the Netbase JSC sites (citations pooled over Perplexity sonar, Google AI Mode and OpenAI) and the 8 Netbase JSC sites themselves (Netbase-owned, part of Netbase JSC, the company behind Leadee); 6 of the Netbase sites were in both lists. clutch.co, wordpress.com and themanifest.com refused the request, which leaves 58 hosts we could judge (one of them, dnsleaktest.com, has no robots.txt, which allows every crawler).

On 57 of the 58, Googlebot and OAI-SearchBot got the same answer for the home page. The one exception was help.sap.com: it allows Googlebot and Bingbot, names GPTBot and ChatGPT-User with Allow: /, but never names OAI-SearchBot, so ChatGPT's search crawler falls under the User-agent: * group, which blocks it. That is very likely an oversight rather than a choice, and it is exactly the kind of gap that a Google-only SEO check misses.

reddit.com is a different case: its robots.txt disallows / for all five tokens we tested, including Googlebot, through the * group. Search engines' access to Reddit is governed by agreements outside robots.txt, which we did not verify. Do not copy a large platform's robots.txt; it may rely on arrangements your site does not have.

Google Search returns a list, and your page has a position in it. ChatGPT returns a written answer. When it searched the web, the answer carries citations: links attached to the specific sentences they support. In OpenAI's API each citation is a url_citation with the page's address and the start and end of the text span it backs up. OpenAI also says the model usually consults more pages than it cites, so being read is not the same as being shown.

There is no position 1 to 10. The useful questions become: were you named, were you cited, and for which question? Being named and being cited are different events, and you can have one without the other. What ChatGPT citations are explains the difference with our own counts.

That also changes what a page needs. A Google result is a whole page behind a title and snippet. A ChatGPT citation points at a passage, so each passage that answers a buyer question should make sense on its own, with the subject, the number and the source in it. How to write pages ChatGPT can quote walks through that rewrite.

Because the same question gives different answers on different runs. A Google ranking is fairly stable from one hour to the next; a ChatGPT answer is generated fresh each time and can name different companies. One screenshot is one sample. Leadee's tracker therefore asks each question several times and reports a rate (how many runs named or cited you) with a confidence interval, not a position.

Small samples are very uncertain. In our 2026-10-25 round, OpenAI's gpt-5 with web search ran 25 times across the 7 Netbase JSC sites before the account ran out of credit. A Netbase domain was cited in 3 of the 25 runs: 12%, with a 95% interval from 4.2% to 30.0%. That interval is so wide that the result is an indicator, nothing more, and it is why we would not compare it with a Google ranking report.

If you want to start tracking without a paid tool, how to check if ChatGPT mentions your brand and the ChatGPT prompt tracking sheet show a manual setup that respects this variation.

In Google you can rank for your own brand name almost by default. In AI answers the same is roughly true: when a question names the brand, the answer usually names it too. The hard part is the question a buyer asks before they know you, such as "best WooCommerce product designer plugin".

We re-counted the 2026-10-25 tracker runs for the Netbase JSC brands in the US by the shape of the question. Questions with the brand name in them produced a mention in 62 of 84 runs (73.8%, interval 63.5-82.0%). Questions without it produced a mention in 20 of 274 runs (7.3%, interval 4.8-11.0%). These counts pool three engines (Perplexity sonar, Google AI Mode and OpenAI), so they are not ChatGPT-only numbers, and brands of different size and niche are mixed together.

The practical point holds anyway: a branded mention mostly shows that the engine knows you exist. Progress shows up in unbranded questions, which is where buyers who have not heard of you are. How to find the prompts customers ask ChatGPT helps you build that list.

Yes. Google crawls the raw HTML first and then renders JavaScript pages in a headless browser before indexing them. Vercel's measurement of AI crawler traffic found that none of the major AI crawlers it tested, OpenAI's included, executed JavaScript. A page whose prices, product names or service descriptions only appear after scripts run can look complete to Google and empty to ChatGPT's crawler.

The fix is the same one many SEO teams already use for speed: put the important text in the HTML the server sends. JavaScript rendering for AI shows how to check what a crawler sees and the options per framework.

Three checks cover most of the gap. First, make sure OAI-SearchBot is allowed in robots.txt and not blocked by your firewall: the help.sap.com case shows how easily it is missed. Second, make sure the key facts are in the server-sent HTML. Third, rewrite the few passages that answer your most important buyer questions so they can be quoted alone.

Then start measuring rates for unbranded questions, monthly, with enough runs to see a trend. Skip tactics with no evidence behind them: an llms.txt file, for example, has no documented effect on ChatGPT (what the evidence says). The free ChatGPT Visibility Checker covers the first two checks in one run.