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Topic gaps, what AI engines connect with you and what they miss

Topic gaps is a way to see which parts of a topic AI engines connect with your brand. For each topic, Axiom GEO asks ChatGPT, Perplexity, Gemini and Claude about you and up to three competitors. It compares the answers with your website and lists the sub-topics you are missing, each with a suggested fix.

AI engines asked per topic
4
AI engines asked per topic
competitors compared
3
competitors compared
kinds of gap, each with a fix
3
kinds of gap, each with a fix

Key points

  • A topic is one core service, product or subject, such as a service line you want to be known for.
  • Each engine is asked what it knows about you and each competitor in relation to the topic.
  • The answers are broken into sub-topics and compared with what your own pages cover.
  • Every gap is marked as not found on your site, only mentioned, or covered but not picked up.
  • Each gap comes with a suggested fix and can go straight to Work as a task.

Why look at topics, not only keywords?

AI engines do not answer with a list of pages that match a phrase. They answer with what they know about a subject and the brands they connect with it. When someone asks about fitted kitchens, the answer might mention worktop materials, design visits, guarantees and made to measure units, and name the firms it links with each.

If the engines link those things to your competitors and not to you, you are less likely to be named. A keyword report will not show this, because the gap is in what the engines know, not in a single phrase. Topic gaps shows it directly.

How does a topic check work?

You add a topic, such as a service line, and choose up to three competitors. The competitors you already track in your prompts are filled in for you. Then each check runs in four stages.

  1. Ask the engines. Each engine in your plan is asked what it knows about your brand in relation to the topic, and the same for each competitor. One neutral question asks what matters most about the topic itself.
  2. Break the answers into sub-topics. The answers are read and turned into one shared list of sub-topics, such as products, features, standards, guarantees, places and types of customer. For each answer, the platform records which sub-topics it connects with that brand.
  3. Check your website. The pages on your site that best match the topic and each sub-topic are read, and each sub-topic is marked as covered, only mentioned, or not found.
  4. Score and suggest fixes. Each brand gets a knowledge score. Gaps are ranked by how strongly the engines link them to competitors, and each one gets a short suggested fix.

A check usually takes two to four minutes. You can see every answer in full, so nothing is hidden behind the score.

What do you see?

  • Knowledge scores. Your score and each competitor's, out of 100, with a trend line once a topic has been checked more than once.
  • A short summary. Two or three sentences on the overall picture for the topic.
  • Gaps. Each one shows the engines that connect it with you and with each competitor, whether your site covers it, how serious it is, and what to do.
  • Strengths. Sub-topics at least half the engines already connect with you, with the page that covers each one.
  • A topic map. Every sub-topic against every brand and engine, plus what your site covers, in one table.
  • The answers. Each engine's full answer for each brand, with the pages it cited.

What kinds of gap are there?

GapWhat it meansThe usual fix
Not found on your siteEngines link it to competitors, and the pages checked do not cover itAdd a section or page, if you offer it
Only mentioned on your siteIt is named in passing, with no clear sectionGive it a heading and specific detail
On your site, not picked upYour site covers it, but engines still do not link it to youMake it easier to find, link to it and get it mentioned elsewhere

Gaps are marked critical when the engines link a sub-topic to a competitor strongly and not to you at all. Significant and minor gaps follow. Anything that clearly does not fit your business is kept apart in a list marked as probably not relevant.

What happens after a gap is found?

Each gap can go to Work as a task with one click. The task carries the suggested fix, the page to update and a short checklist. When the topic is checked again, you can see whether the engines now link that sub-topic with you.

Topic gaps sits well next to content opportunities, which starts from your Search Console data and rankings, and page optimisation, which checks each page in detail. Our guide to how AI engines choose sources explains why clear, specific pages tend to be picked up.

Where it fits

Topic gaps is one of the Improve tools. It works alongside AI visibility tracking, which measures whether you are named for the questions buyers ask, and competitor share of voice, which shows who is named instead. Plans and credit prices are on the pricing page.

Frequently asked questions

What is the difference between a topic gap and a keyword gap?

A keyword gap is a search phrase your competitors rank for and you do not. A topic gap is a part of a subject that AI engines link to your competitors but not to you, such as a feature, a standard or a type of customer. Engines answer in topics, so the gaps are found the same way.

How is the knowledge score worked out?

Each answer is broken into sub-topics. The score shows how many of them the engines connect with a brand, out of 100, with more weight for sub-topics that more brands and the neutral answer raise. The same method scores your competitors, so the numbers can be compared.

Which engines are used?

The engines in your plan. ChatGPT, Perplexity and Gemini search the web when they answer, so their view can change quickly. Claude answers from what the model already knows, so it shows the longer term picture and only changes when the model is retrained.

How many credits does a check use?

Each engine question is charged at the normal credit price for that engine, plus one charge for reading the answers, checking your site and writing the fixes. The screen shows the cost before you run it. With four engines and three competitors it is about 520 credits.

How often should I run it?

Monthly suits most topics, and you can choose weekly, every three months or only when you press the button. Changes to your site can take a few weeks to show in the engines that search the web, and longer in engines that answer from memory.

Does it tell me to write about things I do not offer?

No. Fixes are phrased as suggestions, such as adding a section if you offer something, and they never invent facts about your business. Gaps that clearly do not fit, such as a region you do not serve, are put in a separate list marked as probably not relevant.
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