Top AI Chatbots by Market Share November 2026

Key takeaways

• ChatGPT accounts for 56.6% of worldwide AI chatbot web-visit share in October 2026, down 0.8 points from September. Its share had risen for four straight months from a May low of 53.7%, and October is the first month since then that it slipped.
• Claude reached 11.7% worldwide share in October 2026, up 1.9 points in one month. Its web visits rose 24% from September to 1.25 billion, the largest monthly gain of any assistant, and are up 536% year over year.
• Google Gemini is second at 24.7% worldwide share with 2.64 billion web visits in October 2026. Its share has fallen for four months from a June peak of 28.6%, and its visits are 9% below their May peak.
• The seven assistants drew 10.68 billion combined web visits in October 2026, the highest month on record in this data and the first month above the 9.8 billion to 10.4 billion range they held from March to September. The total is up 27% year over year.
• In the United States, ChatGPT accounts for 62.9% of web-visit share in October 2026, Gemini 16.5%, and Claude 14.8%. Claude is now within 2 points of Gemini in the US after gaining 1.6 points in a month.
• Microsoft moved its consumer Copilot website from copilot.microsoft.com to copilot.com during September and October 2026. Counting both addresses, Copilot drew 80.1 million web visits in October, level with September. This report now counts both.
• ChatGPT leads in 16 of the 18 countries this report breaks out beyond the US, based on September 2026 country data, the latest available. Gemini leads in Italy (44.8% to 43.5%), and DeepSeek leads among these seven assistants in China (73.2%).
• No flagship model released in September or October 2026 published GPQA Diamond or SWE-bench Verified scores, and list prices kept falling: GPT-6.1 Terra arrived on October 26 at $1 input and $5 output per million tokens, and Claude Haiku 5.5 on October 7 at $0.10 and $0.50.

Which AI chatbot has the largest market share in November 2026?

ChatGPT has the largest AI chatbot market share in the November 2026 edition, at 56.6% of worldwide web visits among the seven largest generative AI chatbots in October 2026, the latest complete month of data. The seven assistants drew 10.68 billion combined web visits that month. ChatGPT and Google Gemini together hold 81.3% of those visits, and the other five assistants split the remaining 18.7%, with Claude alone at 11.7%.

Source: Similarweb, total (desktop and mobile web) visits, worldwide, October 2026. Shares are each assistant's visits as a percentage of the seven assistants' combined visits and may not sum to 100% because of rounding. MoM compares September 2026; YoY compares October 2025. Microsoft Copilot counts copilot.microsoft.com and copilot.com together in every month.

Which apps are counted, and which are not

The ranking includes standalone, general-purpose generative AI assistants on a separable primary web domain above roughly 50 million monthly web visits. It excludes assistants with no separable domain such as Meta AI inside Meta's apps, companion and character apps such as Character.AI, answer aggregators such as Poe, and major Chinese-language assistants such as Doubao, Ernie, and Qwen. Adding any of these would lower each of the seven share figures, most visibly at positions 4 to 7. Read the lower positions as shares of these seven assistants, not of all AI chatbot usage worldwide.

Microsoft Copilot's web app now answers at two addresses. Beginning in September 2026, copilot.microsoft.com started redirecting to copilot.com, and Similarweb shows copilot.com rising from 1.8 million worldwide visits in August to 16.5 million in September and 49.1 million in October, while copilot.microsoft.com fell from 73.5 million to 31.0 million over the same months. Counting only the old address would show Copilot falling 52% in October; counting both shows it flat at 80.1 million, above the 50 million inclusion line. This edition adds copilot.com to Copilot for every month, which changes Copilot's figures by less than 2 million visits a month before August 2026 and restates its September 2026 share as 0.8% instead of the 0.6% published last month.

What changed in AI chatbot usage in October 2026?

October 2026 was Claude's month. Claude's worldwide web visits rose 24% from September to 1.25 billion, adding 241 million visits in one month, more than the other six assistants' combined net change. DeepSeek rose 4% and ChatGPT 2%. Gemini, Grok, and Microsoft Copilot were flat to down 1%, and Perplexity fell 4%.

Claude's gain was not a one-day spike. Its worldwide weekday visits climbed from about 43 million a day in the first full week of October to about 49 million a day in the last full week, and its visits in the week of October 19 to 25 were 9.1% above the week of October 5 to 11. Anthropic released Claude Opus 5.5 on September 22, Claude Sonnet 5.5 on September 28, and Claude Haiku 5.5 on October 7, 2026, so the rise coincides with a run of three releases, though the data cannot attribute visits to any one of them. ChatGPT's 2% October gain is smaller than its 4% September-to-October gain in 2025, so the month was ordinary for ChatGPT and unusual for Claude.

What is the AI chatbot market share in the United States?

In the United States, ChatGPT accounts for 62.9% of AI chatbot web-visit share in October 2026, ahead of Google Gemini (16.5%) and Claude (14.8%). Claude gained 1.6 points of US share in a month and now trails Gemini by 33 million US visits, down from a 76 million gap in September. The US market is more concentrated at the top than the worldwide market, and Claude's US share is higher than its worldwide share because the US accounts for 23.7% of Claude's visits, the second-highest US concentration among the seven.

Source: Similarweb, total web visits, United States, October 2026. US quarterly growth compares July 2026; US YoY compares October 2025. Shares may not sum to 100% because of rounding. Microsoft Copilot counts copilot.microsoft.com and copilot.com together.

The seven assistants drew 1.95 billion combined US web visits in October 2026, up 37% year over year, faster than the 27% worldwide growth. ChatGPT's US visits rose 6% in October after a 14% jump in September, so its US total is up 26% over the quarter, more than twice its 11% worldwide quarterly gain.

How has AI chatbot market share changed over time?

AI chatbot web-visit share moved from ChatGPT to Gemini and Claude for most of the past 20 months, partly reversed toward ChatGPT after May 2026, and moved toward Claude in October. ChatGPT's share of the seven assistants' combined visits fell from 76.5% in February 2025 to a low of 53.7% in May 2026, recovered to 57.4% by September, and slipped to 56.6% in October. Gemini's share rose from 5.6% to a peak of 28.6% in June 2026 and has fallen in each of the four months since, to 24.7%. Claude's share rose from 1.4% to 9.8% by July 2026, held there through September, and reached 11.7% in October.

Source: Similarweb, total worldwide web visits; each assistant's share of the seven assistants' combined visits at each month. February and May 2025 columns are taken from earlier editions of this report. Columns may not sum to 100% because of rounding.

ChatGPT held 78% to 79% through August 2025, lost about 24.5 points over the next nine months as Gemini and Claude scaled, regained 3.7 points from May to September 2026, and gave back 0.8 points in October. Gemini's climb was steady from September 2025 to June 2026 and then reversed, with four consecutive monthly share declines. Claude has had two step changes: its visits rose 111% from February to March 2026, from 290 million to 614 million, and after five flat months they rose 24% in October. DeepSeek's February 2025 figure (12.1%) reflects its launch spike, and it has held between 3.2% and 4.3% since August 2025.

Is the AI chatbot market still growing?

The AI chatbot market grew again in October 2026 after six flat months. The seven assistants drew 10.68 billion combined web visits in October 2026, up 27% from 8.43 billion in October 2025 and up 3.6% from September. October is the highest month in this data, above the previous record of 10.37 billion in May 2026, and the first month outside the 9.8 billion to 10.4 billion range that held from March through September.

The October increase came from two assistants. Claude added 241 million visits and ChatGPT added 127 million, against a combined 374 million increase in the total, so the other five assistants were net flat. Over the longer window from May to October 2026, ChatGPT added 483 million monthly visits and Claude 301 million, while Gemini lost 266 million, DeepSeek 58 million, Microsoft Copilot 52 million, Perplexity 50 million, and Grok 41 million. Whether October marks a return to growth or a single strong month will show in the November data.

How do ChatGPT, Gemini, and Claude compare?

ChatGPT, Gemini, and Claude are the three largest AI chatbots by web traffic, and in October 2026 each is on a different path. ChatGPT is the largest, with visits near their October 2025 peak but a share 16.5 points lower than a year ago. Gemini is second and has lost share for four months. Claude is third and posted the largest one-month gain of the three in visits, share, and US share.

Source: Similarweb, total web, October 2026; unique visitors and largest market are September 2026, the latest month with those figures. Company-reported users from OpenAI's DevDay 2026 recap and Alphabet's Q2 2026 earnings remarks; these are self-reported, include apps, and use different definitions.

Is ChatGPT gaining or losing market share?

ChatGPT lost 0.8 points of web-visit share in October 2026 after gaining share in each of the previous four months. Its worldwide share rose from 53.7% in May 2026 to 57.4% in September, then fell to 56.6% in October, because Claude's visits grew 24% while ChatGPT's grew 2%. ChatGPT's visit count has stayed in a narrow band: 5.35 billion to 6.17 billion in each of the 16 months from July 2025 to October 2026. October 2026 (6.05 billion) is 2% below October 2025 (6.17 billion), its highest month, so a year of change in the market left ChatGPT's own traffic about where it started.

ChatGPT's share now depends on what its rivals do. Through May 2026 it lost share because Gemini and Claude grew around a flat ChatGPT. From May to September it regained share because Gemini, DeepSeek, Grok, Perplexity, and Copilot all shrank. In October it lost share to Claude alone. ChatGPT's engagement remains the strongest of the seven: its worldwide bounce rate was 24.0% in October, the lowest in the set, down from 33.5% in April 2026, and it still serves more web visits than the other six assistants combined.

Is Google Gemini overtaking ChatGPT?

Google Gemini is not overtaking ChatGPT on the web, and the gap widened for a fifth month. Gemini drew 2.64 billion worldwide web visits in October 2026 against ChatGPT's 6.05 billion, so ChatGPT's web traffic is 2.3 times Gemini's, up from 1.9 times in May. Gemini's visits peaked at 2.90 billion in May 2026 and are 9% lower five months later, and its share fell from 28.6% in June to 24.7% in October.

Web visits understate Gemini more than most assistants. Alphabet reported 950 million monthly active users for the Gemini app on July 22, 2026, and much of Gemini's use runs through the Android app, the Google app, and Workspace, which web-visit data does not capture. Some of Gemini's measured web visits also arrive from Google entry points, which can raise or lower its share as Google changes those entry points. Gemini leads ChatGPT outright among these seven assistants in one large country, Italy, and comes within 4 points in Vietnam and within 6 points in Turkey, based on September 2026 country data. Google released Gemini 4 Argon on September 30 and announced Gemini 4 Carbon on October 28, 2026, both with access limited at first to cybersecurity defenders and partners, so neither had a broad consumer release that October web data could reflect.

How fast is Claude growing in 2026?

Claude is the fastest-growing major AI chatbot by web visits over the past year, up 536% from 197 million worldwide web visits in October 2025 to 1.25 billion in October 2026. October 2026 is Claude's largest monthly gain since March: its visits rose 24% from 1.01 billion in September, after holding between 947 million and 1.01 billion from May through September. Over six months Claude's visits are up 52% from 824 million in April.

Claude's October gain built through the month rather than arriving all at once. Its weekday visits ran about 43 million a day in the week of October 5 to 11 and about 49 million a day on October 26 to 28, so Claude entered November at a higher run rate than its October average. In the United States, Claude drew 286.9 million web visits in October 2026, up 19% in a month and 371% year over year, for a 14.8% US share. The gap to Gemini in the US narrowed from 76 million visits in September to 33 million in October. Worldwide, Gemini's visits are still 2.1 times Claude's.

Which AI chatbot is growing the fastest in 2026?

Ranked by quarterly web-visit growth from July to October 2026, Claude (+29%), ChatGPT (+11%), and DeepSeek (+8%) grew, while Gemini (-2%), Grok (-3%), Microsoft Copilot (-3%), and Perplexity (-15%) declined. Over a full year, Claude grew fastest (+536%), followed by Gemini (+123%).

Source: Similarweb, worldwide total web visits. MoM compares September 2026, quarterly compares July 2026, six-month compares April 2026, YoY compares October 2025. Microsoft Copilot counts both of its web addresses in every month.

The horizons tell different stories. Gemini is up 123% year over year but down 2% over the quarter, because its climb ended in May. ChatGPT is up 11% over the quarter and down 2% over the year, because October 2025 was its best month. Grok is flat year over year but down 27% over six months from a March 2026 peak of 326 million visits. Read a single growth figure as the net change between two dates, not as a steady rate.

Which AI chatbot is declining the fastest?

Perplexity is declining the fastest by web visits. Its worldwide web visits fell 60% year over year, from 218.9 million in October 2025 to 88.3 million in October 2026, and have fallen in each of the seven months since March 2026. Perplexity is also the only assistant in the set whose US app users outnumber its web users, so web visits capture a smaller part of its use than for the others. Microsoft Copilot is down 26% year over year and 39% over six months, but its October 2026 figure was flat against September once both of its web addresses are counted.

What happened to Microsoft Copilot's web traffic?

Microsoft Copilot's web traffic moved to a new address rather than away from the web. In September 2026, copilot.microsoft.com began redirecting to copilot.com. Similarweb shows copilot.com rising from 1.8 million worldwide web visits in August 2026 to 16.5 million in September and 49.1 million in October, while copilot.microsoft.com fell from 73.5 million in August to 64.4 million in September and 31.0 million in October. Counting both, Copilot drew 75.3 million visits in August, 80.9 million in September, and 80.1 million in October.

The two addresses behave differently. In October, copilot.microsoft.com had a 69% bounce rate and 2.1 pages per visit, consistent with people landing on a page that forwards them elsewhere, while copilot.com had a 34% bounce rate and 3.4 pages per visit, closer to a normal assistant session. Copilot's spring 2026 surge, when its US visits rose from 21.5 million in February to between 40 and 48 million from March to June with a 66% to 69% bounce rate, also fits traffic routed in from another Microsoft entry point rather than people choosing the web app. Most Copilot usage runs inside Windows, Edge, and Microsoft 365, so Copilot's 0.7% web-visit share understates its reach more than for any other assistant.

Which AI chatbot is most popular in each country?

ChatGPT is the most-used AI chatbot by web visits in 16 of the 18 countries this report breaks out beyond the United States, based on September 2026 data, the latest month for which Similarweb has published country-level figures. Gemini leads in Italy with 44.8% of the seven assistants' visits against ChatGPT's 43.5%. DeepSeek leads among these seven assistants in China at 73.2%. ChatGPT's lead is narrowest in Vietnam (46.8% to Gemini's 43.5%), Turkey (48.4% to 43.0%), and Mexico (47.1% to 39.2%), and widest in the United Kingdom (68.2%), Australia (66.6%), and Brazil (65.1%).

Source: Similarweb, total web visits by country, September 2026, the latest month with country-level data. Each cell is that assistant's share of the seven assistants' combined visits in that country; Copilot here is copilot.microsoft.com only. Countries are ordered by the seven assistants' combined visits. China figures cover only these seven assistants; domestic Chinese assistants such as Doubao, which are not in the set, are larger there.

In Australia, Claude is second at 15.5%, ahead of Gemini's 12.5%, the only country in the table where Claude outranks Gemini. Claude's October gain was not yet in the country data, so its position in countries where it was within a few points of Gemini, such as the United Kingdom (13.0% to 14.3%), may have changed. In Russia, DeepSeek has 32.1%, and Perplexity's 3.6% is its highest share of any country in the table. Japan, Indonesia, Vietnam, Mexico, Turkey, and Italy all give Gemini more than a third of visits, while the United Kingdom, Australia, and Canada give it less than a fifth.

Where does each AI chatbot's traffic come from?

The United States is the largest country for six of the seven assistants, and China is the largest for DeepSeek. In September 2026, the US supplied 19.5% of ChatGPT's web visits, 12.0% of Gemini's, and 23.7% of Claude's. DeepSeek drew 44.5% of its visits from China and 10.9% from Russia, with the US third at 5.5%. Gemini is the most geographically spread of the seven, and DeepSeek the most concentrated.

Source: Similarweb, share of each assistant's own total web visits by country, September 2026, the latest month with country-level data. Copilot here is copilot.microsoft.com only.

India is the second-largest country for four of the seven assistants: ChatGPT, Claude, Grok, and Perplexity. DeepSeek's base explains why its worldwide share (3.5%) is more than three times its US share (1.0%). The October US figures confirm the pattern for Claude: its US visits grew 19% in October against 24% worldwide, so its October gain was spread across countries rather than concentrated in the US.

How many people use each AI chatbot?

ChatGPT drew 492.6 million monthly unique web visitors worldwide in September 2026, the most of any assistant, followed by Gemini (313.1 million) and Claude (119.0 million). September is the latest month for which Similarweb has published monthly unique visitors; the October figures were not yet available when this edition was prepared. These counts cover each assistant's website only and exclude iOS and Android apps. Companies report larger figures that include apps: OpenAI said 1.2 billion people use ChatGPT each week at its DevDay on September 29, 2026, and Alphabet reported 950 million monthly active users for the Gemini app on July 22, 2026.

Source: Similarweb, monthly unique visitors, total web, worldwide, September 2026. Copilot is copilot.microsoft.com only; copilot.com drew a further 4.4 million unique visitors in September, and the two cannot be added because visitors to both addresses would count twice. Company-reported figures from the OpenAI DevDay 2026 recap and Alphabet's Q2 2026 earnings remarks; they are self-reported and use different definitions and dates.

ChatGPT's visitors return most often, at 12.0 web visits per visitor in September 2026, against about 8.4 for Gemini and Claude. Unique visitor counts are not deduplicated across assistants, so one person who uses three assistants counts three times, and the seven figures cannot be added into a single total of AI chatbot users.

How much does web traffic undercount app usage?

Web visits undercount total usage by roughly 15% to 60% depending on the assistant, because native iOS and Android apps record usage that does not appear in web data. The latest platform breakdown available for this report is for the United States in May 2026. It counts active users by device, a different metric from web visits, and is not deduplicated across platforms, so read it as a directional measure of where each assistant's usage lives.

Source: Similarweb, active users by platform, United States, May 2026. Platforms are not deduplicated, so totals are not additive. The May 2026 Copilot web figure falls inside the spring surge described above.

Perplexity is the only assistant whose app users outnumber its web users, so its 0.8% web-visit share understates its reach more than any other in the set. Apps account for close to 40% of ChatGPT's and Grok's US users.

Which AI chatbots have the highest user engagement?

By October 2026 engagement metrics, Grok has the longest web sessions and Microsoft Copilot the shortest. Grok averaged 10 minutes 3 seconds and 9.3 pages per visit, more than 50% longer than any other assistant. ChatGPT has the lowest bounce rate of the seven at 24.0%, followed by Claude at 27.2% and Gemini at 27.8%. Claude's average visit, at 6 minutes 31 seconds, is now within a second of ChatGPT's.

Source: Similarweb, total worldwide web traffic, October 2026. October figures are visit-weighted averages of Similarweb's daily data for October 1 to 31. Microsoft Copilot combines copilot.microsoft.com (69% bounce) and copilot.com (34% bounce).

Grok's session length has fallen from a peak of 12 minutes 58 seconds in February 2026, and its pages per visit from 21.4 to 9.3, but it remains an outlier, likely because grok.com bundles activity beyond chat and is entangled with X. Treat both its engagement and its visit counts as directional. Claude's bounce rate fell from 28.0% in September to 27.2% in October while its visits rose 24%, so the new visits were not noticeably less engaged than the old ones.

How do the models behind the leading assistants compare?

The flagship models behind the leading assistants in October 2026 are the ones released in late September, plus a second wave of cheaper tiers released in October, and none of them published GPQA Diamond or SWE-bench Verified scores, the two benchmarks earlier editions of this report used to compare them. OpenAI released GPT-6.1 Sol on September 29 at $2 input and $10 output per million tokens, then GPT-6.1 Terra, a computer-use model, on October 26 at $1 and $5. Anthropic released Claude Opus 5.5 on September 22 at $4 and $20, then Claude Haiku 5.5 on October 7 at $0.10 and $0.50 for prompts up to 100,000 tokens. Google released Gemini 4 Argon on September 30 at an introductory $2 and $10 and announced Gemini 4 Carbon on October 28 at $4 and $20, with no public API yet. xAI's Grok 4.7 (September 21) stayed at $2 and $6.

Data from DemandSphere AI Frontier Model Tracker, updated November 4, 2026, used with permission. GPT-6.1 Sol is the mid tier of the GPT-6 line; GPT-6 Astra ($10/$50) is the top tier. Gemini 4 Argon's $2/$10 is an introductory rate; its listed standard rate is $4/$20. Copilot routes to OpenAI and Microsoft MAI models, and Perplexity routes queries to third-party models, so neither lists a separate base model.

The labs moved their headline claims to agentic and task benchmarks such as OSWorld, Terminal-Bench, and AutomationBench, so published figures no longer support a single like-for-like capability column across the five makers. Price is where the models now differ most, and the October releases pushed the floor lower: Claude Haiku 5.5's $0.50 output price is one fortieth of Opus 5.5's, and GPT-6.1 Terra's $5 is half of GPT-6.1 Sol's. DeepSeek V4 Pro's open weights still list at about a third of GPT-6.1 Sol's output price, a gap that coincides with DeepSeek's strength in Russia and China. Model releases can coincide with usage changes, as Claude's October rise after three September and October releases shows, but a release does not reliably move web share on its own: GPT-6.1 Sol's September 29 release was followed by a 2% ChatGPT gain in October, in line with its usual seasonal pattern.

How did October 2026 unfold week by week?

Inside October 2026, Claude and DeepSeek kept gaining through the month while the rest of the set held flat. Comparing the week of October 19 to 25 with the week of October 5 to 11, Claude's worldwide web visits rose 9.1% and DeepSeek's 8.6%, Grok's rose 1.8%, Gemini's were flat (-0.1%), ChatGPT's fell 0.8%, Perplexity's fell 2.1%, and Microsoft Copilot's combined visits fell 16.7% as traffic on its old address dropped faster than copilot.com grew.

A within-month rise means an assistant's end-of-month run rate is above its monthly average, so its November figure can grow even if nothing else changes. Claude's last full week of October (296 million visits) scales to about 1.3 billion for a 31-day month, above its 1.25 billion October total. These are three-week comparisons of daily data, so read them as direction, not as a forecast. The December 2026 edition will report the full November month.

Frequently asked questions

What are the top AI chatbots in November 2026? By worldwide web-visit share in October 2026, the latest complete month for the November 2026 edition, the top AI chatbots are ChatGPT (56.6%), Google Gemini (24.7%), Claude (11.7%), DeepSeek (3.5%), Grok (1.9%), Perplexity (0.8%), and Microsoft Copilot (0.7%).

What is the most popular AI chatbot in 2026? ChatGPT is the most-used AI chatbot in 2026 by web visits, at 56.6% of worldwide web-visit share and 6.05 billion web visits in October 2026.

What is ChatGPT's market share? ChatGPT held 56.6% of worldwide AI chatbot web-visit share and 62.9% of US web-visit share in October 2026.

What is Gemini's market share? Google Gemini held 24.7% of worldwide AI chatbot web-visit share in October 2026, down from a peak of 28.6% in June 2026, and 16.5% in the United States.

What is Claude's market share? Claude held 11.7% of worldwide AI chatbot web-visit share in October 2026, with 1.25 billion web visits, and 14.8% of US web-visit share. Both are its highest to date.

What is DeepSeek's market share? DeepSeek held 3.5% of worldwide AI chatbot web-visit share in October 2026, with 372.8 million web visits, 44.5% of them from China as of September.

What is Grok's market share? Grok held 1.9% of worldwide AI chatbot web-visit share in October 2026, with 203.8 million web visits, fifth among the seven leading assistants.

What is Perplexity's market share? Perplexity held 0.8% of worldwide AI chatbot web-visit share in October 2026, with 88.3 million web visits, down 60% year over year, though its app users outnumber its web users.

What is Microsoft Copilot's market share? Microsoft Copilot's web app held 0.7% of worldwide AI chatbot web-visit share in October 2026, with 80.1 million web visits across copilot.microsoft.com and copilot.com, though most Copilot usage runs inside Windows, Edge, and Microsoft 365 and does not appear in web visits.

Is Gemini overtaking ChatGPT? Not on the web. ChatGPT drew 2.3 times Gemini's worldwide web visits in October 2026, up from 1.9 times in May, and Gemini's share has fallen for four months.

Which is bigger, Gemini or Claude? Google Gemini is bigger. Gemini drew 2.64 billion worldwide web visits in October 2026 against Claude's 1.25 billion, about 2.1 times as many. In the United States the gap is narrower: 320.3 million to 286.9 million.

Which is bigger, ChatGPT or Claude? ChatGPT is bigger. ChatGPT drew 6.05 billion worldwide web visits in October 2026 against Claude's 1.25 billion, about 4.8 times as many, and 4.3 times as many US web visits.

What is the best AI chatbot? This report measures usage, not quality. By usage, ChatGPT leads with 56.6% of worldwide web visits in October 2026. Which assistant fits best depends on the task. Among the flagship models in the table above with published scores, GPT-5.5 (88.7%) and Claude Opus 4.8 (88.6%) led SWE-bench Verified for coding, and Gemini 3.1 Pro (94.3%) led GPQA Diamond for science reasoning.

Which AI chatbot is growing the fastest? Claude is growing the fastest on all four horizons in this report: up 24% in October 2026, 29% over the July to October quarter, and 536% year over year in worldwide web visits.

Which AI chatbot is declining the fastest? Perplexity, down 60% in worldwide web visits from October 2025 to October 2026 and down 15% over the July to October quarter.

Is ChatGPT losing market share? Slightly, in October 2026. ChatGPT's worldwide web-visit share fell to 56.6%, down 0.8 points, after rising for four months from a May low of 53.7%. It is 16.5 points below October 2025.

Is the AI chatbot market still growing? Yes. The seven assistants' combined web visits rose 27% year over year and 3.6% month over month to 10.68 billion in October 2026, the highest month on record in this data.

How many people use ChatGPT? OpenAI reported 1.2 billion weekly ChatGPT users at its DevDay on September 29, 2026. Similarweb counted 492.6 million monthly unique visitors to chatgpt.com in September 2026, web only.

How many people use Gemini? Alphabet reported 950 million monthly active users for the Gemini app on July 22, 2026. Similarweb counted 313.1 million monthly unique visitors to gemini.google.com in September 2026, web only.

How many people use Claude? Anthropic has not published a current user count. Similarweb counted 119.0 million monthly unique visitors to claude.ai in September 2026, web only, before Claude's 24% October rise in visits.

What is ChatGPT's market share in the United States? ChatGPT held 62.9% of US AI chatbot web-visit share in October 2026, ahead of Gemini (16.5%) and Claude (14.8%).

Which AI chatbot is most used in the United States? ChatGPT is the most-used AI chatbot in the United States, with 1.22 billion US web visits in October 2026 and a 62.9% share.

Which AI chatbot is most popular in India? ChatGPT, with 64.1% of the seven assistants' web visits in India in September 2026, followed by Gemini (20.2%) and Claude (11.7%).

Which AI chatbot is most popular in Europe? ChatGPT leads in the United Kingdom (68.2%), Germany (62.6%), France (62.5%), and Spain (55.0%), while Gemini leads in Italy (44.8% to ChatGPT's 43.5%), based on September 2026 web visits.

Which AI chatbot is most popular in Japan? ChatGPT, with 55.6% of the seven assistants' web visits in Japan in September 2026, followed by Gemini at 35.5%, one of Gemini's strongest showings.

Which AI chatbot is most popular in the United Kingdom? ChatGPT, with 68.2% of the seven assistants' web visits in the UK in September 2026, its widest lead in any country in this report, followed by Gemini (14.3%) and Claude (13.0%).

Which AI chatbot is most popular in Brazil? ChatGPT, with 65.1% of the seven assistants' web visits in Brazil in September 2026, followed by Gemini at 26.3%.

Which AI chatbot is most popular in Australia? ChatGPT, with 66.6% of the seven assistants' web visits in Australia in September 2026. Claude is second at 15.5%, ahead of Gemini at 12.5%.

Which AI chatbot is most popular in China? Among these seven assistants, DeepSeek leads in China with 73.2% of web visits in September 2026. Domestic Chinese assistants such as Doubao are not in the set and are larger there.

Where is Claude most popular? The United States supplies 23.7% of Claude's web visits, followed by India (10.4%), as of September 2026. By share of each country's AI chatbot visits, Claude is strongest in Australia (15.5%) and the United States (14.8% in October 2026).

Is DeepSeek popular outside China? DeepSeek's largest market after China is Russia, where it has 32.1% of the seven assistants' web visits. In the United States, its share is 1.0%.

Why does Statcounter show a different ChatGPT share? Statcounter's AI chatbot figure (51.58% for ChatGPT in October 2026, after 80.48% in September) is built from data collected on member websites and appears to track referrals from assistants to other websites, not usage of the assistants. This report measures visits to the assistants themselves, where ChatGPT's share is 56.6%.

What happened to Microsoft Copilot's web traffic in October 2026? It moved address. copilot.microsoft.com began redirecting to copilot.com in September 2026; copilot.com drew 49.1 million worldwide web visits in October and the old address 31.0 million, for a combined 80.1 million, level with September.

Which AI model is the most capable in 2026? No like-for-like answer is available for the current flagships, because GPT-6.1, Claude Opus 5.5, Gemini 4, and Grok 4.7 launched without published GPQA Diamond or SWE-bench Verified scores. Among earlier models with published scores, Gemini 3.1 Pro leads GPQA Diamond at 94.3% and GPT-5.5 leads SWE-bench Verified at 88.7%.

Which AI chatbot has the cheapest flagship model? DeepSeek V4 Pro lists at $1.74 input and $3.48 output per million tokens, the lowest of the five makers' flagships in November 2026, followed by Grok 4.7 at $2 and $6. Among smaller tiers, Claude Haiku 5.5 and GPT-6 Luna both list at $0.10 and $0.50.

Which is bigger, ChatGPT or Perplexity? ChatGPT is bigger by a wide margin. ChatGPT drew 6.05 billion worldwide web visits in October 2026 against Perplexity's 88.3 million, about 68 times as many, though Perplexity's app users outnumber its web users.

Which is bigger, ChatGPT or DeepSeek? ChatGPT is bigger. ChatGPT drew 6.05 billion worldwide web visits in October 2026 against DeepSeek's 372.8 million, about 16 times as many. In China, among these seven assistants, DeepSeek is larger, with 73.2% of web visits in September 2026.

What is Grok's market share in the United States? Grok held 2.6% of US AI chatbot web-visit share in October 2026, with 51.5 million US web visits, fourth behind ChatGPT, Gemini, and Claude.

Which AI chatbot is most popular in Canada? ChatGPT, with 64.3% of the seven assistants' web visits in Canada in September 2026, followed by Gemini (19.3%) and Claude (11.6%).

Which AI chatbot is most popular in Germany? ChatGPT, with 62.6% of the seven assistants' web visits in Germany in September 2026, followed by Gemini (21.5%) and Claude (9.8%).

How many people use AI chatbots in total? No deduplicated total exists, because one person can use several assistants and web counts exclude apps. The seven assistants in this report drew 10.68 billion combined worldwide web visits in October 2026, and their September 2026 unique web visitor counts (492.6 million for ChatGPT down to 14.0 million for Copilot) cannot be added without counting the same people more than once.

How often is this report updated? Monthly, using the latest complete month of Similarweb data. The November 2026 edition uses October 2026 data plus a week-by-week reading of October.

Why do AI chatbot market share reports disagree?

AI chatbot market share reports disagree mainly because they measure different things. In October 2026, ChatGPT's share is 56.6% of web visits among these seven assistants in this report, and 51.58% in Statcounter's worldwide AI chatbot figure for the same month, which lists Gemini at 28.86%, Perplexity at 15.04%, and Claude at 2.3%. Statcounter's September figure for ChatGPT was 80.48%, so its series moved 29 points in one month while the web-visit series moved less than 1 point. Statcounter's data comes from tracking code on member websites, which suggests it measures how often each assistant sends people to other websites rather than how often people use the assistant. Assistants that cite and link out often score higher on that kind of measure than assistants used mainly for writing or coding, which would explain why Perplexity ranks far higher and Claude far lower there than in visit data. Four methodology gaps cause most discrepancies:

• No stated denominator. A share figure that does not specify users, sessions, visits, referrals, or revenue cannot be reconciled with any measured quantity.
• Undisclosed set of assistants. Adding or removing one assistant changes all the other shares; a ranking that adds Meta AI or a Chinese assistant will show lower figures for all seven here.
• Undisclosed geographic scope. A US-only ranking increases the share of US-concentrated assistants such as Claude and decreases the share of Asia-heavy assistants such as DeepSeek; a worldwide ranking does the reverse.
• Web versus app blindness. A ranking built on web visits alone undercounts app-first assistants such as Perplexity, where app users outnumber web users.

A ranking is only as credible as the method a reader can inspect, so this report states its metric, set, geography, and month under each table.

AI chatbot market share by users vs. web visits

AI chatbot market share measured by users, app downloads, or revenue ranks the field differently from web visits, and no single public source measures those consistently across assistants. Company-reported user counts use different definitions and dates: OpenAI reports weekly users for ChatGPT, and Alphabet reports monthly active users for the Gemini app. This report found no comparable current user counts published for Claude, Grok, DeepSeek, Perplexity, or the Copilot web app as of November 2026. Revenue share is dominated by API and enterprise contracts that no consumer-usage metric captures. This report uses web visits because it is one defined, reproducible quantity that can be pulled again and audited. Where a question is about users or revenue, read web-visit share as a proxy for consumer web demand.

How is AI chatbot market share measured?

AI chatbot market share in this report is web-visit share: each assistant's monthly visits to its primary web domain, estimated by Similarweb, as a percentage of the seven assistants' combined visits. The headline window is October 2026, the latest complete month as of November 5, 2026. October visit totals are sums of Similarweb's daily figures for October 1 to 31; the same daily sums reproduced Similarweb's published September 2026 monthly total exactly in a check for chatgpt.com. October engagement figures are visit-weighted averages of the same daily data. Unique visitors and country breakdowns are September 2026, the latest month for which Similarweb had published them. Month-over-month compares September 2026, quarterly compares July 2026, six-month compares April 2026, and year-over-year compares October 2025. The monthly trend runs from July 2025, and the February and May 2025 trend columns are taken from earlier editions. Microsoft Copilot counts copilot.microsoft.com and copilot.com together from this edition onward. Figures are worldwide unless a country is named. Estimates are panel-modeled, come with an error band rather than decimal precision, and are revised month to month, so single percentages are best read as approximate.

Does web traffic capture total AI chatbot usage?

No. Web traffic understates total AI chatbot usage, and it does so unevenly across assistants. Web visits measure the consumer web product, not total model usage or revenue. Four categories sit outside, or distort, web-visit data:

• Native mobile apps. Every assistant in the set has iOS and Android apps, and the platform table shows apps accounting for 15% to 60% of US users depending on the assistant.
• Embedded products. Most Microsoft Copilot usage occurs inside Windows, Edge, and Microsoft 365, and Gemini runs across the Google app, Android, and Workspace. Entry points from those products can also add low-engagement visits to the web data, as Copilot's spring 2026 surge and its 69% bounce rate on its old address in October show.
• API and enterprise consumption. A large share of OpenAI's, Anthropic's, and Google's token volume runs through APIs that generate no web visit.
• Automated traffic. Panel-and-model estimates can include non-human traffic, and AI domains are common automation targets, which adds noise to any single-month figure.

Web-visit share is a reproducible public view of the consumer web market, and it is not offered as a measure of total usage.

What does AI chatbot market share mean for brands and AI search visibility?

For brands, AI chatbot market share shows where to monitor AI search visibility, which is a different question from where a brand is already cited. ChatGPT and Gemini holding 81.3% of the seven assistants' worldwide web visits in October 2026 means those two assistants produce most AI-mediated brand impressions, so monitoring should start there. Claude's rise to 11.7% worldwide and 14.8% in the US makes it a third assistant worth tracking for any brand with a US, UK, or Australian audience. The country table changes that priority by market: a brand selling in Italy, Vietnam, Turkey, or Mexico should weight Gemini close to ChatGPT.

Whether a brand appears in those answers depends on other signals: being indexed and ranking in Google Search, which feeds Gemini and AI Overviews, and being present on the third-party sources these assistants ground answers on, such as review platforms, community threads, and structured listings. With frontier models now competing more on price and agentic tasks than on headline benchmark gaps, the usage race turns more on distribution and grounding than on raw model quality. Presence on other websites complements a brand's own website content.

AI search visibility measurement is directional rather than measurement-grade, because assistant answers vary from run to run, no public dataset of real prompts exists, and most prompts are unique. Track it at the topic level as a trend, report usage-share data like this report as the defined quantity it is, and treat share of citations inside AI answers as an estimate.

Methodology and data sources

• Metric: web visits (a session on the assistant's primary web domain) and web-visit share within this defined group of seven assistants.
• Data source: Similarweb, total = desktop and mobile web, pulled November 5, 2026. Frontier-model data from the DemandSphere AI Frontier Model Tracker, used with permission (updated November 4, 2026). Company-reported user figures from OpenAI's DevDay 2026 recap and Alphabet's Q2 2026 earnings remarks. Statcounter figures from its AI chatbot market share page, September and October 2026.
• Data window: October 2026 (latest complete month), built from Similarweb daily data for October 1 to 31. Monthly trend July 2025 to October 2026; February and May 2025 trend columns from earlier editions. Unique visitors and country tables use September 2026, the latest month published. Week-by-week reading compares October 19 to 25 with October 5 to 11.
• Comparisons: month-over-month vs September 2026; quarterly vs July 2026; six-month vs April 2026; year-over-year vs October 2025.
• Domains: chatgpt.com, gemini.google.com, claude.ai, deepseek.com, grok.com, perplexity.ai, and for Microsoft Copilot both copilot.microsoft.com and copilot.com, combined in every month from this edition onward.
• Scope of data: worldwide ranking, United States ranking, 16-month monthly trend, combined market size, 18-country share table, top countries for all seven assistants, unique visitors, engagement, a US platform breakdown of web versus app users (May 2026, the latest available), a frontier-model price comparison, and a week-by-week October reading.
• Inclusion rule: standalone, general-purpose generative AI assistants on a separable primary web domain above roughly 50 million monthly web visits.
• Excluded apps: assistants without a separable domain (Meta AI), companion and character apps (Character.AI), aggregators (Poe), major Chinese-language assistants (Doubao, Ernie, Qwen), and small standalone apps.
• Known limits: web visits exclude native apps, embedded products, and API or enterprise usage; entry points inside Windows, Edge, Microsoft 365, or Google products can add visits to some assistants' web counts; the platform and model tables use different metrics and dates from the web-visit ranking; estimates are panel-modeled, come with error bands, and are revised monthly.
• Update cadence: monthly.