How Microsoft Copilot Chooses Which Sources to Cite (2026)

Microsoft Copilot picks its sources from Bing. When it needs facts from the web, it sends “grounding” queries to Bing’s index, pulls back the most relevant passages, and cites the pages it used. Microsoft says grounding uses the same crawlers and quality signals as Bing search.

For brands, that makes Copilot the most familiar AI engine to work with. If Bing can crawl, index and trust your pages, they are eligible for Copilot. Brands get named when they appear clearly in the pages Bing retrieves: retailer listings, reviews, “best X” articles, reference sites and their own websites.

Copilot is also unusual in one way: Microsoft gives site owners citation data. Bing Webmaster Tools now shows how often your pages are cited in Copilot. Microsoft is still clear that nothing guarantees a citation. This guide covers what Microsoft has said, what the 2026 data shows and what a brand can do.

• The short answer: what decides a Copilot citation
• How Copilot finds and cites pages, step by step
• How citations appear in Copilot answers
• Measuring citations: the Bing AI Performance report
• Bingbot, robots.txt and the controls that affect Copilot
• Which sites Copilot cites most in 2026
• Listicles, reviews and “best X” articles
• Freshness: does Copilot prefer new content?
• Which brand signals matter for Copilot mentions
• What a brand can do: a 9-step plan
• Limits: what no one can guarantee
• FAQs
• Get your brand into the sources Copilot reads

The short answer: what decides a Copilot citation

Here is the whole process in one table. Each row is covered in detail below.

How Copilot finds and cites pages, step by step

1. Copilot sends grounding queries to Bing

Microsoft calls the process of fetching web evidence for an AI answer “grounding”. In an October 2025 post, Microsoft wrote that experiences like Microsoft Copilot are “powered by Bing’s search index”.

Grounding queries do not look like what users type. In a study of one site’s Copilot data (July to October 2026, 328,700 citations across 1,319 pages), the median grounding query was 4 words long. Only 8.4% of the top 154 queries were phrased as questions. 14.9% asked for evaluation, with words like “review”, “legit”, “best” or “compare”. Another analysis by Search Influence (February 2026) described the queries as machine-written keyword strings.

The lesson is that short, keyword-style rankings in Bing still matter, even though users ask Copilot long questions.

2. Grounding uses the same index as Bing search

In a May 2026 post on the Bing blog, Microsoft explained that grounding shares the same crawlers and quality signals as search. What changes is the unit of value. Instead of ranking whole pages, grounding looks for “groundable” information: facts with clear provenance that can support a specific statement in an answer.

Microsoft’s grounding is not only used by Copilot. Jordi Ribas wrote on the Bing blog in February 2026 that Microsoft grounding “powers nearly every major AI assistant in the market”. As we covered in our guide to how ChatGPT chooses sources, OpenAI names Microsoft among its search providers.

3. Copilot’s citations match Bing more closely than other assistants

An Ahrefs study of 15,000 long-tail prompts (August 2025) compared the URLs each AI assistant cited with Google’s and Bing’s top 10 results. Across assistants, the average overlap with Bing’s top 10 was about 10%. Copilot had the highest Bing overlap of any assistant tested.

That is still a minority of citations. Grounding queries differ from the user’s original question, so Copilot often cites pages that do not rank for the question itself.

4. Copilot breaks pages into pieces

Microsoft says Copilot parses content into smaller pieces, evaluates them, and assembles the best ones into an answer (Microsoft Advertising). Its advice follows from that:

• Use clear titles, H1s and meta descriptions.
• Structure pages with headings, Q&A sections, lists and tables.
• Add schema markup where it fits.
• Avoid long walls of text, key information hidden in tabs, information only in images, and key facts locked in PDFs.

5. Copilot checks, loops and sometimes abstains

Microsoft’s May 2026 post adds three details. Retrieval can run in loops, with follow-up searches when the first evidence is not enough. Conflicts between sources need to be detected. And the system can abstain when the evidence is too weak. Stale or contradictory facts on your pages work against you, because they make your content harder to use as evidence.

How citations appear in Copilot answers

Microsoft described the citation format when it introduced Copilot Search in Bing in April 2025:

• Sources are cited prominently, with a list of every link used to build the answer.
• Inline links can sit on whole sentences or passages, not just a small number.
• Cited sources appear at the top and bottom of the answer.

Copilot Search launched worldwide except in Russia and China. Citations appear in the Copilot app, in AI-generated summaries in Bing, and in some partner products that use Bing grounding.

Microsoft’s rewritten Bing Webmaster Guidelines also make a point worth repeating to stakeholders: a decline in clicks does not always mean lost visibility. Users may read your content in a Copilot answer without visiting your site.

Measuring citations: the Bing AI Performance report

Bing Webmaster Tools added an AI Performance report as a public preview on February 11, 2026. It shows how often your pages are cited across Microsoft Copilot, AI-generated summaries in Bing and selected partner integrations.

In June 2026, Microsoft added four views. Intents groups grounding queries by purpose, such as informational, commercial or local. Topics groups them by subject. Citation Share shows your share of all citations for a grounding query. A Compare view was added at the same time.

Know the limits. Microsoft says the report does not show placement or ranking inside an answer. Citation Share does not reveal which competitors take the rest, and it is not a share of traffic. The report has no click data.

What early users have found

• Citations are concentrated. Search Influence looked at 91 days of its own data: 19,717 citations across 86 pages. One page took 69% of citations, and the top four took 90%.
• Citations are volatile. In the same data, citations peaked at 5,804 on December 7, 2025, then fell by 97% by February 2026.
• Queries are short and varied. In Lilach Bullock’s single-site study, 23 of the top 154 grounding queries were in languages other than English, covering 13.4% of citations.
• Content changes are hard to read. The same study added matching sections for 15 grounding queries. 13 gained citation share, with a median gain of 5.2 points. But queries that were not touched also rose, by a median of 4 points. The author does not claim cause and effect.

These are single-site case studies, so treat them as examples of what the report can show, not as benchmarks.

Bingbot, robots.txt and the controls that affect Copilot

Copilot does not have its own named crawler for grounding. It relies on Bing’s index, so Bingbot is the bot that matters. The Bing Webmaster Guidelines, rewritten in February 2026 and covered by Search Engine Journal, explain how standard controls affect Copilot and grounding.

Other points from the guidelines:

• Do not block Bingbot from pages you want cited, and keep pages reachable through crawlable links.
• Use IndexNow and XML sitemaps with accurate lastmod dates, so Bing picks up changes quickly.
• Consolidate duplicate pages, so signals point to one URL.
• Local businesses should keep Bing Places listings accurate, as the AI Performance announcement recommends.

Many sites have never reviewed how they treat crawlers and AI bots. Our study of AI bots in SaaS robots.txt files found that 73% of top SaaS sites name no AI bot at all. You can check your own file with the free robots.txt AI bot checker on our tools page.

What about llms.txt? Microsoft’s guidelines do not mention it. Adoption is growing anyway: 74% of 47 leading B2B SaaS sites serve an llms.txt file. Treat it as optional housekeeping, not a ranking lever. IndexNow and clean Bing indexing are the proven basics for Copilot.

Which sites Copilot cites most in 2026

The freshest public snapshot is Ahrefs’ list of the 50 most-cited websites in Copilot, based on more than 3 million US queries across all topics in September 2026.

Three things stand out:

• Retailers lead. Amazon and Walmart take almost 30% of the top-50 share between them, with Target, Etsy and Best Buy in the top 15. For product categories, accurate retailer listings are a direct source of Copilot citations.
• Smaller sites can break in. Ahrefs notes several low-authority sites in the top 50, including one with a Domain Rating of 5. Copilot appears to care more about the passage than the domain.
• The list is consumer-heavy. It covers all topics, so B2B sources look smaller than they are in a software category. Business and review sources in the top 50 include Forbes, LinkedIn, Consumer Reports and Trustpilot.

The lesson: check which sources Copilot cites for your buyer prompts. For your own site, the AI Performance report shows which pages already get cited.

Listicles, reviews and “best X” articles

“Best X” articles already have the shape of the answer Copilot builds: a shortlist of named options with reasons. They also match how Copilot is told to read content. Microsoft recommends lists, tables, clear headings and Q&A sections, which is the standard format of a good comparison article.

What the data says

• Evaluation queries are common. In the Lilach Bullock study, 14.9% of the top grounding queries used words like “review”, “best” or “compare”.
• Review sites are in the top 50. Consumer Reports, Trustpilot and BBB all appear in Ahrefs’ Copilot list.
• Bing rankings carry over. Copilot’s citations overlap with Bing’s top 10 more than any other assistant’s in the Ahrefs study, so lists that rank in Bing have an advantage.

Which lists are worth being on

We found no Copilot-specific study of which listicles get cited. Based on Microsoft’s own guidance, these traits should help:

1. The list ranks in Bing for short “best [category]” and “[brand] review” style queries.
2. Each entry is easy to lift. A clear heading, a short description, key facts and a “best for” line.
3. The facts are current. Microsoft says stale facts lead to wrong answers and that conflicting sources are detected.
4. The facts are verifiable. Bing’s guidelines ask for content that can be checked on its own, with clear entities and key information near the top.

So the goal is not “get on any list”. It is to be included, with accurate detail, in independent, well-maintained comparisons that rank in Bing. That is what our brand mentions service focuses on.

Retailers, reference sites and review platforms

• Retailers lead Copilot’s citations for product queries. Keep titles, specifications and descriptions accurate on every marketplace you sell through.
• Wikipedia is third in the Ahrefs list. Most brands do not qualify for an article, and Wikipedia’s conflict-of-interest rules discourage editing your own page. Earn the press coverage that would make you notable instead.
• Review platforms such as Trustpilot and BBB appear in the top 50. Up-to-date profiles with recent reviews are basic hygiene.

Freshness: does Copilot prefer new content?

Microsoft’s own statements point to freshness as a quality issue rather than a ranking bonus. Its May 2026 post says stale facts produce wrong answers. Its guidelines recommend IndexNow and accurate lastmod dates so Bing learns about changes quickly.

We found no public study that measures the age of the pages Copilot cites. The case studies do show that citations move fast. Search Influence saw a 97% drop within about two months. Lilach Bullock saw daily citations grow from 539 to 11,225 over three months on another site.

In practice:

• Use IndexNow, so Bing is notified of updates instead of waiting for a re-crawl.
• Update pricing, features and comparison pages when facts change, and make sure the date reflects a real change.
• Remove or fix outdated facts that contradict your current pages. Conflicting sources make your content harder to use.

Which brand signals matter for Copilot mentions

Citations are about pages. Mentions are about brands. We found no large correlation study of brand signals for Copilot specifically. Microsoft’s guidance does give clues:

• Clear entities. Bing’s guidelines ask for content with clearly identified entities. Use your brand name, product names and category consistently.
• Provenance. Grounding looks for facts with clear sources. A brand described the same way across its own site, retailers, reviews and the press is easier to cite with confidence.
• No manipulation. The 2026 guidelines expand Bing’s abuse rules to cover prompt injection, AI manipulation, link schemes and scaled content published without oversight.

This is why digital PR and earned mentions sit at the centre of AI visibility work. Bing still uses crawlable links to discover pages, so link building supports the retrieval step. But the mention on a trusted page is what gets your brand named.

What a brand can do: a 9-step plan

1. Verify your site in Bing Webmaster Tools. Check indexing, crawl errors and the AI Performance report.
2. Allow Bingbot and check meta tags. Make sure key pages are not blocked, noindexed or marked noarchive by mistake.
3. Turn on IndexNow. Keep sitemap lastmod dates accurate.
4. Read your grounding queries. Look for short, keyword-style queries where you are cited, and where your pages should be cited but are not.
5. Structure key pages. Put key facts near the top, use headings, lists, tables and Q&A sections, and keep important information out of images, tabs and PDFs.
6. Build a prompt list. Write 20 to 50 prompts a buyer would ask Copilot, run them monthly, and note cited sources and named brands.
7. Fix your retailer and review profiles. Accurate marketplace listings and recent reviews feed the sources Copilot cites most.
8. Get into lists that rank in Bing. Pitch independent “best X” articles and reviews with accurate, useful information.
9. Earn press with original data. Data-driven content and digital PR create mentions on trusted sites that Bing indexes quickly.

Limits: what no one can guarantee

Be careful with anyone who promises Copilot placements.

• Microsoft says there is no guarantee. Its October 2025 guidance says there is “no secret sauce that guarantees selection”. Bing’s guidelines say the same about citations.
• The report is a sample. Grounding queries in Bing Webmaster Tools are a sample, and the report does not show ranking inside answers or clicks.
• Citations swing fast. One site lost 97% of its citations in about two months. Short windows can mislead.
• Answers vary. Copilot can run follow-up searches, abstain or pick different sources for the same question.
• Most evidence is correlational or from single sites. Even content changes that coincide with gains may not be the cause.

A sensible goal is to raise the share of relevant prompts where your brand appears and the citations shown in Bing Webmaster Tools, tracked over months.

FAQs

Does Copilot use Bing or Google?

Copilot uses Bing. Microsoft says experiences like Microsoft Copilot are powered by Bing’s search index, and grounding shares the same crawlers and quality signals as Bing search. If your pages are not indexed in Bing, they are very unlikely to be cited in Copilot, whatever your Google rankings.

Can I see how often Copilot cites my site?

Yes. The AI Performance report in Bing Webmaster Tools, launched in February 2026, shows total citations, cited pages, a sample of grounding queries and trends. Since June 2026 it also shows intents, topics and citation share. It does not show clicks or where you appear inside answers.

Can I stay in Bing but keep my content out of Copilot?

Yes. Bing’s guidelines say the noarchive tag stops content being used in Copilot answers and grounding while the page can stay in Bing search. The nocache tag limits Copilot to the URL, title and snippet. A noindex tag removes the page from Bing and Copilot entirely.

Does IndexNow help with Copilot?

IndexNow tells Bing straight away when a page is added or changed, so updates reach the index used for grounding faster. Microsoft recommends it in both its guidelines and the AI Performance announcement. It does not guarantee a citation. It removes delay between your update and Bing seeing it.

Why does Copilot cite Amazon and Walmart so often?

Ahrefs’ September 2026 data covers broad US queries, many of them about products, so retailers lead. Product pages hold specific, structured facts such as prices and specifications, which suit grounding. For consumer brands, accurate marketplace listings are part of Copilot visibility. B2B brands should check their own prompts.

Do I need different content for Copilot than for Google?

Mostly no. Bing’s guidelines say SEO fundamentals still apply. The differences are emphasis: get indexed in Bing, use IndexNow, put key facts near the top, and write sections that make sense alone. Copilot’s grounding queries are short, so keyword-style rankings in Bing still count.

Get your brand into the sources Copilot reads

Copilot names the brands it finds in the pages Bing trusts: lists, reviews, retailers and press coverage. Create & Grow places brands in relevant “best X” articles, reviews and press pieces, and runs digital PR campaigns that earn mentions on sites AI assistants cite. Brand mention plans start at €1,500 a month.

We cannot guarantee that Copilot will mention you, and nobody honestly can. We can show you which sources it cites for your category and get you into the ones that matter. Contact us to start with a short audit of your prompts.

This guide is part of our series on AI search sources, which also covers ChatGPT, Perplexity and Claude.

More guides in this series on how AI search picks sources: ChatGPT, Google AI Overviews, Gemini, Perplexity, Claude.