Key takeaways
- Assistants answer from what they learned in training and, often, from pages they fetch at the moment.
- Clear, specific, well-supported pages from sites that others cite are used more.
- Because answers vary, the only reliable way to learn what works is to measure over many samples.
No AI assistant publishes the full rules it uses to choose sources, and the rules change as products do. What we can say comes from what the companies document and from watching thousands of answers: which pages get cited, and what they have in common. Treat it as practical guidance, not a formula.
Two sources of an answer
An assistant can answer from what the model learned in training, or from pages it retrieves when you ask. Many assistants do both. What was learned in training changes only when the model is updated. What is retrieved can change the day you publish, which is why fixing a page can change an answer in weeks rather than months.
What retrieved sources have in common
- They answer the question directly, near the top of the page.
- They state facts that can be checked, with a date or a named source.
- They are easy to read: clear headings, short paragraphs, real tables and lists.
- They come from sites that other trusted sites mention or link to.
- They agree with other sources about basic facts such as who you are and what you do.
What gets in the way
- Key content that appears only after a script runs, or inside an image.
- A page the assistant's crawler is blocked from reading. See robots.txt and AI crawlers.
- Facts that differ between your site and your profiles.
- Thin pages that repeat what a hundred others say.
Why each assistant differs
Assistants use different search providers, different crawlers and different models, so the same question can name different businesses. Some always show their sources; some show few. This is why we measure each assistant separately, and why a single answer from one of them is a weak guide.
What to do
| Goal | Action |
|---|---|
| Be readable | Make sure the crawlers can fetch your key pages |
| Be quotable | Put the answer first and make facts checkable |
| Be consistent | Fix differences between your site and your profiles |
| Be trusted | Earn mentions from independent sources |
| Know what works | Measure weekly, with several samples and a range |
Where this fits
This is the logic behind our AI visibility work. The guide to measuring AI search visibility shows how to test what you change, and how to write a page assistants quote shows what a quotable page looks like.