AI search statistics become stale quickly. Products change, interfaces expand to new regions, measurement tools revise their definitions, and a number reported for one sample is often repeated as if it described the entire market.
This guide does not preserve the previous collection of unverified figures. Instead, it explains how to build a reliable evidence brief from primary sources and how to decide whether a statistic is strong enough to publish.
An estimate is not a fact. It can still be useful when its assumptions are visible, but it must not be presented with the certainty of a measured disclosure.
The catalog was last verified August 20, 2026. It contains six dated records and separates official company disclosures from original research. It includes no SkillAEO internal estimates. Company figures are publisher disclosures, not independently audited unless the source says so.
These records are dated snapshots, not universal benchmarks and not causal proof. Read each record's date, sample, definition, method, and limitations before applying it elsewhere.
Evidence catalog
Source-checked AI search statistics
These figures are dated snapshots, not universal benchmarks or causal proof. Review each record's sample, method, and limitations before applying it to a different market or period.
No SkillAEO internal estimates are published in this catalog.
Official company disclosures
Figures published by the companies themselves. Treat these as first-party reporting without third-party validation.
Official company disclosure
Google reported that AI Overviews had more than 2.5 billion users each month.
More than 2.5 billion
billion monthly users
- Source class
- Official company disclosure
- Source date
- Last verified
- Confidence
- First-party disclosure
Review sample, method, and limitations
- Sample size
- Not disclosed in the publisher announcement.
- Market / locale
- Not disclosed in the publisher announcement.
- Metric definition
- Monthly users of Google AI Overviews as described in the publisher announcement.
- Calculation notes
- The publisher stated more than 2.5 billion and did not publish a derivation.
- Limitations
- The counting rule, deduplication method, and independent audit status were not disclosed; global scope was not further defined.
- Direct source
- Alphabet investor presentation, June 2026
Official company disclosure
OpenAI reported that ChatGPT had 900 million weekly users.
900 million
million weekly users
- Source class
- Official company disclosure
- Source date
- Last verified
- Confidence
- First-party disclosure
Review sample, method, and limitations
- Sample size
- Not disclosed in the publisher announcement.
- Market / locale
- Not disclosed in the publisher announcement.
- Metric definition
- Weekly ChatGPT users as described in the publisher announcement.
- Calculation notes
- The publisher stated 900 million and did not publish a derivation.
- Limitations
- The counting rule, deduplication method, and independent audit status were not disclosed; global scope was not further defined.
- Direct source
- The next phase of enterprise AI
Original research
Findings reported by the organizations that collected or analyzed the underlying observations.
Original research
Pew classified 18% of 68,879 March Google searches as having an AI summary based on April reruns of the same queries.
18%
percent of observed Google searches
- Source class
- Original research
- Source date
- Last verified
- Confidence
- Bounded observational study
Review sample, method, and limitations
- Sample size
- 900 US adults who shared browsing activity from March 1 through March 31, 2025, covering 68,879 Google searches.
- Market / locale
- United States adult browsing activity from March 1 through March 31, 2025.
- Metric definition
- The 18% is the share of March search visits later classified as having an AI summary. Each next-visited URL came from the March browsing records; AI summary presence and content came from the same queries rerun from April 7 through April 17, 2025.
- Calculation notes
- Participant browsing activity ran from March 1 through March 31, 2025; the same queries were rerun from April 7 through April 17, 2025 to classify AI summary presence and content.
- Limitations
- AI summaries may have changed between each original search and the later query rerun. This timing mismatch means the classification may not describe the exact results a participant saw, and the observational panel does not establish population-wide behavior.
Original research
March browsing records showed traditional-result clicks on 8% of visits later classified as having an AI summary, compared with 15% classified without one.
8% vs 15%
percent of visits
- Source class
- Original research
- Source date
- Last verified
- Confidence
- Bounded observational study
Review sample, method, and limitations
- Sample size
- 900 US adults who shared browsing activity from March 1 through March 31, 2025, covering 68,879 Google searches.
- Market / locale
- United States adult browsing activity from March 1 through March 31, 2025.
- Metric definition
- A traditional-result click was identified from the next-visited URL in the March browsing records; AI summary presence and content came from the same queries rerun from April 7 through April 17, 2025.
- Calculation notes
- Participant browsing activity ran from March 1 through March 31, 2025; the same queries were rerun from April 7 through April 17, 2025 to classify visits with and without an AI summary.
- Limitations
- AI summaries may have changed between each original search and the later query rerun. This timing mismatch means the classification may not describe the exact results a participant saw; the comparison is correlation, not causation.
Original research
Semrush found that 15.69% of its dataset of more than 10 million keywords triggered an AI Overview in November 2025.
15.69%
percent of tracked keywords
- Source class
- Original research
- Source date
- Last verified
- Confidence
- Bounded observational study
Review sample, method, and limitations
- Sample size
- More than 10 million keywords in the Semrush dataset.
- Market / locale
- Market and locale were not disclosed on the source page.
- Metric definition
- Share of keywords in the publisher dataset whose Google results triggered an AI Overview.
- Calculation notes
- The reported 15.69% is the publisher dataset snapshot for November 2025.
- Limitations
- The publisher dataset may not represent all Google queries, and its market and locale composition was not disclosed on the source page.
- Direct source
- Semrush AI Overviews study
Original research
Ahrefs found that AI Overview presence correlated with a 58% lower average desktop position-one click-through rate in December 2025.
58% lower
percent lower average desktop position-one CTR
- Source class
- Original research
- Source date
- Last verified
- Confidence
- Publisher dataset correlation
Review sample, method, and limitations
- Sample size
- 300,000 keywords: 150,000 with an AI Overview and 150,000 informational keywords without one.
- Market / locale
- Desktop searches represented in aggregated Google Search Console data; market and locale were not disclosed.
- Metric definition
- The 58% is the relative decrease from the counterfactual forecast to the actual December 2025 AI Overview-group position-one CTR. The counterfactual forecast applies the non-AI Overview informational control group's CTR change from 2023 to 2025.
- Calculation notes
- Counterfactual forecast CTR was 0.03734 and actual CTR was 0.015677. The calculation was (0.015677 - 0.03734) / 0.03734 ≈ -58%; the forecast used the non-AI Overview informational control group change from December 2023 to December 2025.
- Limitations
- This is a publisher dataset correlation, not causation; differences between the keyword groups or other search changes may affect CTR.
- Direct source
- AI Overviews reduce clicks by 58%
What makes an AI search statistic reliable?
A publishable claim should answer these questions:
- Who published it? Identify the organization and the specific report or disclosure.
- When was it published? Record the publication date and the period measured.
- What exactly was measured? Define the event, user, query, visit, citation, conversion, or revenue unit.
- Which product and mode were included? Distinguish a standalone app, embedded feature, API, browsing mode, and generated Search feature.
- Which region and language were covered? A country-specific sample should not become a global claim.
- How was the sample collected? Record the query set, sites, users, devices, exclusions, and weighting.
- Can the result be reproduced or audited? Look for a dataset, methodology, calculation, or enough detail to repeat the measurement.
- What are the limitations? Note missing products, unknown traffic, attribution gaps, personalization, and sampling bias.
If those details are unavailable, label the claim as an estimate or leave it out.
Use a source hierarchy
Not every source carries the same evidentiary weight. Start as close to the original measurement as possible.
First-party product disclosures
Use official product announcements, investor reports, transparency reports, documentation, and status pages for claims about a company's own users, availability, or product behavior.
Check whether the disclosure describes:
- active users or registered accounts;
- requests, conversations, or people;
- consumer products, APIs, or both;
- a single date or an average period; and
- global usage or a limited market.
A press release that says a product is “used by millions” is not interchangeable with a defined monthly active user metric.
Government and regulatory data
Government statistical agencies, regulators, public filings, and court records can provide primary information about industries, companies, consumer behavior, and legal requirements.
Confirm the jurisdiction and reporting period. A rule or adoption survey from one country should not be generalized to every market.
Original research with a published method
Industry research can be useful when the publisher discloses:
- the research question;
- sampling and recruitment;
- collection dates;
- query or website selection;
- definitions and counting rules;
- exclusions and missing data;
- sponsor or commercial relationship; and
- uncertainty or confidence limits where applicable.
The reputation of the publisher does not replace the methodology.
Analytics and referral measurements
Traffic studies depend heavily on attribution rules. A reliable report should disclose which referrer domains were counted, whether redirects or apps lose referral data, how bots were excluded, and whether the sample represents a particular customer segment.
Do not convert a share within one analytics provider's customer base into a universal market share.
Secondary summaries
Use a secondary article to discover the original source, not as the end of the verification chain. If the original report cannot be found, say so or omit the number.
Build a claim record before writing
Create one record for every statistic considered for publication.
| Field | What to record |
|---|---|
| Claim | Exact wording you plan to publish |
| Primary source | Original disclosure, report, or dataset |
| Publisher | Organization responsible for the measurement |
| Publication date | Date the source became public |
| Measurement period | Dates covered by the underlying data |
| Product and mode | App, API, web search, AI Overview, or other defined surface |
| Geography and language | Markets represented by the sample |
| Population or sample | Users, queries, domains, visits, or transactions |
| Definition | What counts as a query, citation, referral, or conversion |
| Methodology | Collection and calculation method |
| Limitations | Known gaps, bias, uncertainty, and missing coverage |
| Verification date | When your team last checked the source |
| Status | Verified, qualified estimate, disputed, stale, or rejected |
This record makes later updates possible. Without it, a team may keep repeating a number after its source, definition, or product has changed.
A verification workflow
Step 1: Capture the exact claim
Copy the sentence as it appears. Preserve qualifiers such as “among surveyed respondents,” “within this customer sample,” or “for the measured region.” Those words often contain the real scope.
Step 2: Find the original publication
Follow citations until you reach the organization that collected or disclosed the data. A chain of blogs citing one another is not independent confirmation.
Step 3: Read the method, not only the headline
Look for footnotes, appendices, definitions, and exclusions. Check whether the headline reports a measured result, a forecast, or an estimate.
Step 4: Recalculate when possible
If the source provides counts, verify the percentage or rate. Record rounding and denominator choices. Do not combine figures from incompatible samples.
Step 5: Check the date and product version
AI products change frequently. A statistic may remain historically accurate while no longer describing the current product.
Step 6: Compare an independent source
Independent evidence can reveal whether the magnitude is plausible, but it does not automatically validate the first study. Differences may come from definitions, regions, or samples.
Step 7: Choose responsible wording
Use wording that matches the evidence:
- Measured disclosure: “The publisher reported X for the defined period and population.”
- Survey result: “Among the surveyed respondents, X selected the stated answer.”
- Forecast: “The organization projected X under its stated assumptions.”
- Estimate: “The publisher estimated X; no complete first-party count was available.”
- Observation: “In our recorded sample, we observed X. The sample is not representative.”
Step 8: Set a review date
Assign an owner and a next-review trigger. Review after a new product disclosure, methodology change, regional expansion, or material market event.
How to evaluate common AI search claims
Product usage
Separate users, accounts, sessions, messages, and API calls. Avoid adding consumer and enterprise reach unless the source defines a non-overlapping population.
AI referral traffic
Document the referrer list and attribution window. Browser privacy, mobile apps, copied links, and redirects can hide or misclassify visits.
Conversion performance
Use your own funnel definitions and compare like-for-like cohorts. Control for landing page, geography, device, campaign, and customer intent where possible. A conversion rate from one company or analytics provider should not become a universal benchmark.
AI citations
Record the exact questions, engine, product mode, date, location, account state, and visible links. Define whether repeated links count once per answer, once per domain, or once per URL.
Do not describe a small prompt sample as the percentage of all AI answers.
Google AI Overviews
Google says AI Overviews and AI Mode appear when its systems determine they add value, and supporting links can vary. Its official AI features guidance does not provide a universal appearance rate for every site or query.
Google also reports AI feature traffic within Search Console's overall Web search type. Do not invent a separate citation report or infer a universal trigger rate from a limited query study.
Structured data
Google says structured data provides explicit clues about page meaning and can make content eligible for supported Search features. Its general policies state that eligibility does not guarantee display.
Structured data is not an AI prerequisite, and it does not guarantee display, inclusion, ranking, or citation. Do not turn the prevalence of markup in a selected sample into proof of a causal effect.
How to handle forecasts and estimates
Forecasts depend on assumptions. Record the model date, baseline, scenario, and publisher. Avoid language such as “will reach” when the source says “could,” “may,” or “is projected to.”
For estimates:
- state that the number is estimated;
- explain the estimation method;
- show the range or uncertainty when available;
- avoid false precision;
- do not combine unrelated estimates into a new unsupported total; and
- replace the estimate when a primary disclosure becomes available.
If the method cannot be explained, the estimate is not ready for a reliable evidence brief.
How to cite a statistic
A useful citation should link directly to the original page, report, filing, or dataset. The surrounding sentence should include enough scope that a reader does not need to guess what the number represents.
Avoid:
AI search grew dramatically last year.
Prefer:
In its dated report, the publisher measured a defined change for the stated sample and period. The result does not represent products or regions outside that scope.
The second form is less dramatic but more defensible.
Evidence brief template
Use this structure for an internal or public brief:
Claim:
Decision this claim supports:
Primary source:
Publisher:
Publication date:
Measurement period:
Product and mode:
Region and language:
Population or sample:
Metric definition:
Methodology:
Calculation checked:
Limitations:
Independent comparison:
Verification date:
Owner:
Status:
Next review trigger:Quality checklist
Before publishing, confirm:
- The original source is available.
- The publication date and measurement period are recorded.
- The metric definition is clear.
- Product, region, and sample scope are visible.
- Estimates and forecasts are labeled.
- The methodology can be summarized accurately.
- The calculation has been checked.
- Limitations appear near the claim.
- The wording does not imply causation without evidence.
- A review owner and trigger are assigned.
Frequently Asked Questions
What is the best source for AI search statistics?
Use the original organization that measured or disclosed the information. Product companies are the primary source for their own defined usage disclosures; government agencies and public filings are primary sources for regulated reporting; research publishers must provide a method that can be evaluated.
Can I use an estimate?
Yes, when the estimate is necessary and its method, assumptions, uncertainty, and date are clear. An estimate is not a fact and should not be presented as one.
How often should an evidence brief be updated?
Update it when a source publishes new data, changes its definition, expands the measured product or region, or withdraws a claim. The review schedule should match the volatility of the metric.
How do I compare conflicting studies?
Compare their definitions, samples, dates, regions, products, and counting rules before comparing results. Two studies can both be internally valid while measuring different things.
Does a sourced statistic prove a marketing tactic works?
No. A citation proves where a claim came from, not that the study supports causation or applies to your site. Review the research design and measure the result in your own context.
Related Resources
- 7 practical checks for websites seeking AI citations
- Google AI Overviews: practical guidance for site owners
- Schema markup: a practical Google-aligned guide
Build a brief before making a claim
Use the Skillaeo anonymous audit only as one limited Perplexity observation. It does not replace a source record, representative dataset, or verified market statistic.
