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llms.txt GeneratorChatGPT share of generative AI website visits
Similarweb worldwide web panel, May 2026. This is not ChatGPT’s share of all searches.
See the source register below.
Executive summary
There is no single defensible percentage for “AI search market share.” Website visits, active users, search queries, AI citations and outbound referrals describe different activities. This review keeps those measures separate and links each reported figure to its original source. It replaces the earlier unsourced projections on this page with observed or company-reported figures. The latest observation in the web-share comparison is May 2026; checking the sources in October does not turn it into an October estimate.
Key findings
The leading platforms vary by surface: standalone websites, mobile apps and AI features embedded in Search need separate measures.
Do not treat a chatbot visit as a search query or an active user as a referral.
Prioritize platforms using buyer relevance, observed brand coverage and qualified conversions alongside external usage estimates.
- Method in brief
- Desk review of primary publisher reports and company disclosures. Figures retain their original units, observation windows and coverage limits. No proprietary consumer survey or market forecast was conducted for this review.
Methodology
- Approach
- Source review, with no blended market-share denominator
- Data sources
- Similarweb worldwide website panel
- OpenAI product usage disclosure
- Alphabet Search volume disclosure
- Sample
- The source publishers’ own panels and product disclosures; no shared sample
- Timeframe
- 2025 disclosures and May 2026 web estimates; sources checked 5 October 2026
- Where the evidence stops
- Website estimates exclude native-app and API use; Google’s embedded AI features are not Gemini website visits.
- Rounded shares and different periods cannot form a combined pie chart.
- No verified comparable Perplexity figure is available in the cited web-share summary; no percentage is inferred.
Statistics with their denominators
Reported figures retain their original activity, denominator and observation period. Source check date: 5 October 2026.
Scroll across the table to read each figure's basis and source.
| Measure | Reported figure | Basis and period | Source |
|---|---|---|---|
| ChatGPT share of generative AI website visits | ~53% | Visits to generative AI websites in Similarweb’s worldwide panel May 2026 · Worldwide web A web-visit share, not a share of all searches. | Similarweb: 2026 generative AI landscape |
| Gemini share of generative AI website visits | ~27–28% | The same generative AI website visit panel May 2026 · Worldwide web Gemini website visits exclude AI Overviews inside Google Search. | Similarweb: 2026 generative AI landscape |
| Claude share of generative AI website visits | ~9% | The same generative AI website visit panel May 2026 · Worldwide web Rounded source estimate, not an exact census. | Similarweb: 2026 generative AI landscape |
| ChatGPT weekly active users | 900M+ | People using ChatGPT during a week Reported 27 February 2026 · ChatGPT product Use includes writing, coding and other tasks, not only search. | OpenAI: Scaling AI for everyone |
| Annual Google searches | 5T+ | Searches on Google during a year Reported 24 April 2025 · Google Search Annual query volume cannot be divided by weekly active users. | Alphabet: Q1 2025 earnings call |
Data visualizations
Standalone AI website visit share
Analysis
Define the market before comparing it
A percentage needs an explicit activity and denominator.
For a usage chart, ask whether the source counts visits or unique people, which destinations are included, and whether the panel covers web, apps or both. For a search chart, ask how a search task is identified. A conversation can include several requests and still produce no website visit. A single person can use several platforms in the same week. A report that silently switches between those units can produce a persuasive chart with no useful business meaning.
Data points
- Usage share: platform visits divided by visits to the defined platform set.
- Referral share: sessions from one AI source divided by sessions from the defined AI source set.
- Brand share of voice: a brand’s observed mentions divided by a stated competitive mention total.
What it means
- Write the unit and denominator beside every chart.
- Keep each metric in its own trend series rather than combining unlike totals.
Where Perplexity and Google AI fit
A missing figure is a coverage limit, not zero market share.
Perplexity is a distinct answer engine, while AI Overviews and AI Mode are surfaces inside Google Search. They deserve separate checks even when a standalone website panel does not provide a comparable figure. This page does not assign Perplexity a guessed residual or label Gemini website share as Google’s overall AI search share. Coverage should follow the questions your buyers ask and the surfaces where those questions are answered.
Data points
- Do not subtract rounded selected-platform figures from 100% and call the remainder Perplexity.
- Do not add AI Overview impressions to Gemini website visits.
What it means
- Use the same buyer questions to compare observed answers across supported engines.
- Record market, language, date and query wording with each check.
Turn market context into a monitoring plan
Broad platform adoption is a starting point for a brand experiment.
Choose a small set of category, comparison and purchase questions that map to real products. Run the same wording on each relevant engine, keep market controls fixed and save answer evidence. Review which brands are named and which sources support those answers. A platform with fewer total visits can still matter if it repeatedly answers valuable questions in your category. A platform with broad reach can produce little measurable direct traffic while shaping later brand searches.
Data points
- Start with a fixed buyer-query inventory.
- Separate a brand mention from a direct citation to your site.
- Compare recurring observations, not one lucky answer.
What it means
- Assign page or source improvements to a named owner.
- Review mentions, citations, referrals and trial or purchase outcomes together.
Measure your own AI referral mix
Your traffic share describes your site, not the whole market.
In GA4 or PostHog, define the AI source list, preserve first and later touches, and use one completed date range. Remove internal and known automated traffic where possible. Count sessions consistently and attach a conversion definition. When a reader copies a brand name from an answer and later searches Google, that visit may have no AI referrer. Report that attribution limit instead of claiming all direct or branded traffic came from AI.
Data points
- Illustrative calculation: 120 ChatGPT sessions out of 200 measured AI sessions equals 60% of your AI referral sessions.
- That calculation says nothing about 60% of global search demand.
What it means
- Use a referral setup guide before comparing sources.
- Review qualified outcomes and sample sizes before changing investment.
Sources and downloads
- 01Similarweb: 2026 generative AI landscape
Estimated worldwide generative AI website visits; June 2025 to May 2026. Native apps, APIs and AI inside Google Search are separate surfaces.
Published 2026-07-29 · Checked 2026-10-05
- 02OpenAI: Scaling AI for everyone
Company-reported ChatGPT weekly active users, covering the product rather than search-only activity.
Published 2026-02-27 · Checked 2026-10-05
- 03Alphabet: Q1 2025 earnings call
Company-reported Google annual search volume. Includes Google Search, not a standalone generative AI website panel.
Published 2025-04-24 · Checked 2026-10-05
Cite this review
Trakkr Research (2026). AI search market share in 2026. Source review checked 5 October 2026. https://trakkr.ai/insights/ai-search-market-share-2026
Keep the original publisher, observation period and limits when reusing a figure.
Frequently asked questions
Similarweb estimates about 53% of worldwide generative AI website visits in May 2026 went to ChatGPT. That describes standalone web usage in its panel, not all search queries, native-app use or API activity.