Share of voice used to mean your slice of ads, mentions or rankings in a category. In AI search it means something more specific: how often an AI assistant names your brand when someone asks a question you want to be the answer to.
The 2026 data on that metric tells three stories. The platforms where share of voice is earned are shifting fast, with ChatGPT’s lead shrinking. Mentions inside AI answers are highly concentrated among a small group of brands. And the answers themselves change so often that a single check tells you very little. This page gathers the latest figures on all three, with our own calculations where the published numbers leave a gap.
- Key AI Search Share of Voice Statistics
- Where AI Share of Voice Is Earned: Platform Statistics
- Brand Share of Voice and Concentration
- How Much AI Share of Voice Changes
- Share of Voice Differs by Engine
- From Share of Voice to Traffic
- What the Numbers Mean for Measuring Share of Voice
- Frequently Asked Questions
Key AI Search Share of Voice Statistics
- The average brand is mentioned in 16.3% of relevant AI answers; category leaders appear in 56.5%, about 3.5 times as often.
- The top 10% of brands receive about 75% of all AI mentions. The top 1% receive about 30%.
- Between two runs of the same question, ChatGPT and Gemini replace about 64% of their top five recommended brands.
- The first brand an AI names changes between runs 58% of the time on ChatGPT and 64% on Gemini.
- A single check disagrees with the four-month picture about a third of the time.
- ChatGPT and Gemini share only about 2 of their top 5 brands for the same category.
- ChatGPT, Claude, Gemini and Perplexity disagree on whether to name a tracked brand in 27.2% of identical questions.
- ChatGPT’s share of AI chatbot web visits fell from 79.0% in May 2025 to 53.9% in May 2026.
- Gemini’s share rose from 7.6% to 27.9% over the same year, and Claude’s from 1.4% to 9.2%.
- A brand’s own website is not cited in 84% of AI answers about it.
- Reddit accounts for 21.9% of off-site citations in AI answers.
- AI Overviews appear in about 43% of Google searches, up from 15% a year earlier.
- AI Mode has more than 1 billion monthly users and AI Overviews more than 2 billion.
- AI referrals make up about 1.08% of website traffic, roughly ten times the early-2025 level.
- ChatGPT sends about 87% of all AI referral traffic.
Where AI Share of Voice Is Earned: Platform Statistics
Share of voice only matters on platforms people use. The balance between them changed more in the past year than at any point since ChatGPT launched.
| Platform | Share of Chatbot Web Visits, May 2026 | Change Since May 2025 | Web Visits, May 2026 |
|---|---|---|---|
| ChatGPT | 53.9% | -25.1 points | 5.6 billion |
| Gemini | 27.9% | +20.3 points | 2.9 billion |
| Claude | 9.2% | +7.8 points | 952.6 million |
| DeepSeek | 4.1% | -2.2 points | 430.4 million |
| Grok | 2.4% | -0.2 points | 244.9 million |
| Perplexity | 1.3% | -0.5 points | 138.1 million |
| Microsoft Copilot | 1.3% | 0.0 points | 131.6 million |
These figures, compiled from Similarweb data by Momentic, count web visits only, not app use or assistants built into other products. ChatGPT’s visit numbers have held roughly steady; its share fell because the market around it grew by about half in a year.
| Platform | Reported Users | Date |
|---|---|---|
| ChatGPT | 900 million weekly active users | February 2026 |
| Gemini app | 900 million monthly active users | May 2026 |
| Google AI Mode | More than 1 billion monthly users | May 2026 |
| Google AI Overviews | More than 2 billion monthly users | July 2025 |
Google’s AI surfaces reach the most people. According to Similarweb’s 2026 Generative AI Landscape report, AI Overviews now appear in about 43% of Google searches, up from 15% a year earlier, and other trackers put the figure near 48%. For many brands, share of voice inside Google’s AI answers is the largest single slice. Our guide to AI Overviews vs AI Mode explains how the two differ.
Brand Share of Voice and Concentration
AthenaHQ’s State of AI Search 2026 report, based on millions of answers across eight AI models, gives the clearest benchmark for brand visibility.
| Statistic | Figure |
|---|---|
| Share of relevant AI answers that mention the average brand | 16.3% |
| Share that mention the category leader | 56.5% |
| Leader’s visibility compared with the average | About 3.5 times |
| Answers where the brand’s own website is not cited | 84% |
| Reddit’s share of off-site citations | 21.9% |
| Share of citations driven by informational and comparison content | More than half |
| Distinct websites cited per answer, Grok | 27 |
| Distinct websites cited per answer, Gemini | 5 |
A separate analysis by The Answer Signal, covering about 12 million answers in the 30 days to August 5, 2026, measured how mentions are spread. The top 1% of brands, about 150 names, received roughly 30% of all mentions. The top 10% received 75%. The median brand was mentioned about 60 times in the month.
That distribution is steeper than in traditional search, where page two still exists. In an AI answer that names four or five brands, there is no page two. It also explains why off-site brand mentions carry so much weight: 84% of answers about a brand cite someone else’s website.
How Much AI Share of Voice Changes
The most important statistic for anyone tracking share of voice comes from MentionBird, which collected 77,204 answers to 585 buying-intent questions between April and August 2026, roughly one run per question per engine per day.
| Measure, Between Consecutive Runs | ChatGPT | Gemini |
|---|---|---|
| Share of the top five brands replaced | 64.3% | 64.6% |
| A given brand drops in or out of the top five | 39.2% | 39.7% |
| Position changes for a brand that stays in | 54.4% | 57.9% |
| The first-named brand changes | 58.4% | 64.3% |
| A single check disagrees with the four-month result | 30.7% | 33.0% |
| Brands ranked per answer | 5.23 | 8.13 |
Churn was highest on questions where ChatGPT never searched the web (a 43.7% flip rate) and lowest where it always searched (36.7%). Web search makes answers slightly more stable, not less.
How Many Answers You Need to Measure Share of Voice
With answers this changeable, share of voice has to be measured as a sample, like an opinion poll. Using the standard sample-size formula for a proportion, the number of answers needed per question set is:
| Target Precision | Confidence Level | Answers Needed |
|---|---|---|
| Within 10 percentage points | 95% | 97 |
| Within 5 percentage points | 90% | 271 |
| Within 5 percentage points | 95% | 385 |
These figures assume the worst case, a brand mentioned about half the time, and treat each answer as independent. In practice that means tracking a set of 20 questions across five engines with several runs each, not checking a handful of prompts once. Most AI visibility tracking tools are built around exactly this kind of repeated sampling.
Share of Voice Differs by Engine
BrightEdge compared ChatGPT and Gemini across eight categories in June 2026. On average the two engines share only two of their top five brands. Agreement is highest in technology and lowest in finance and insurance, where they share one. The sources they draw on differ just as much: in finance, 98% of ChatGPT’s citations came from exchanges and financial institutions, while 87% of Gemini’s came from media and reference sites.
Research from LLM Scout, published on October 7, 2026, tested 749 identical product-selection questions across ChatGPT, Claude, Gemini and Perplexity. The four disagreed on whether to name a tracked brand at all in 27.2% of cases, with ChatGPT the most willing to name a brand when the others did not.
| Comparison | Finding | Source |
|---|---|---|
| Top-five brand overlap, ChatGPT vs Gemini | About 2 of 5 | BrightEdge, June 2026 |
| Engines disagree on naming a brand | 27.2% of questions | LLM Scout, October 2026 |
| Brands ranked per answer | ChatGPT 5.23, Gemini 8.13 | MentionBird, August 2026 |
| Websites cited per answer | Grok 27, Gemini 5 | AthenaHQ, September 2026 |
From Share of Voice to Traffic
Being mentioned and being clicked are different things. According to Conductor data reported by Analyze AI, AI referrals make up about 1.08% of website traffic across 13,770 enterprise domains, about ten times the early-2025 level. ChatGPT sends 87.4% of those referrals.
Comparing each engine’s share of visits with its share of referrals shows which ones pass attention on to websites. Perplexity, built around citations, sends about three times as much traffic as its visit share would suggest. Gemini sends about a third. Claude sends less than half. A brand’s share of voice on Perplexity is worth more clicks than the same share on Gemini.
| Engagement Measure | ChatGPT Referrals | Google Referrals | Source |
|---|---|---|---|
| Average time on site | 15 minutes | 8 minutes | Similarweb |
| Pages per visit | 12 | 9 | Similarweb |
| Conversion rate on transactional sites | 7% | 5% | Similarweb |
Fewer clicks of higher quality is the pattern. Our comparison of ChatGPT and Google Search covers how the two audiences behave differently.
What the Numbers Mean for Measuring Share of Voice
| Finding | What It Means |
|---|---|
| Top 10% of brands get 75% of mentions | Moving from average to leader is worth far more than a small gain at the bottom |
| 64% of the top five changes between runs | Report share of voice as an average over many answers, never a single screenshot |
| Engines share 2 of 5 top brands | Track each engine separately; a blended number hides real gaps |
| 84% of answers cite someone else’s site | Share of voice is earned mostly off-site |
| ChatGPT’s visit share fell 25 points in a year | Weight engines by current usage, not 2024 habits |
| Perplexity sends 3 times its weight in clicks | Share of voice on citation-led engines turns into traffic more readily |
Frequently Asked Questions
What Is AI Search Share of Voice?
It is the share of relevant AI answers that mention your brand, often compared with the shares of named competitors for the same set of questions.
What Is a Good AI Share of Voice?
The average brand appears in about 16% of relevant answers and category leaders in about 57%, according to AthenaHQ’s 2026 benchmark. Anything above the average puts a brand in a minority, since the top 10% of brands take 75% of all mentions.
Why Does My AI Share of Voice Change Every Day?
AI answers vary between runs. In a study of 77,204 answers, ChatGPT and Gemini replaced about 64% of their top five brands from one run to the next.
How Many Prompts Should I Track?
Enough to collect around 385 answers per question set for results within 5 points at 95% confidence, or about 97 answers for a rough reading within 10 points.
Which AI Platform Matters Most for Share of Voice?
ChatGPT still has the largest share of chatbot visits at 53.9% and sends 87% of AI referral traffic, but Gemini has grown to 27.9% of visits, and Google’s AI Overviews reach more than 2 billion monthly users.
Do ChatGPT and Gemini Recommend the Same Brands?
Only partly. They share about two of their top five brands in a category on average, and as few as one in finance and insurance.
How Much Traffic Comes From AI Search?
About 1.08% of website traffic, according to Conductor’s study of 13,770 enterprise domains, though AI referrals tend to stay longer and convert better than average.
