Claude’s share of generative-AI website traffic rose to 11.5% in October 2026 from 9.6% in September, according to Similarweb’s monthly update posted on X on 10 November. By our arithmetic, that 1.9-point rise is larger than Claude’s whole gain over the five months from April to September, when its share went from 8.0% to 9.6%.
In the same month ChatGPT slipped to 55.7% from 56.4%, and Gemini to 24.2% from 25.0%, Gemini’s third monthly decline in a row in Similarweb’s figures. By our arithmetic, Claude’s share is about 5.5 times the 2.1% Similarweb gives it for November 2025, and the gap between Gemini and Claude narrowed to 12.7 points from 15.4 points in September.
Business Pill · Distribution Advantage
An evergreen Business Engineer explainer on distribution advantage, how reach decides which products get tried. It teaches the general idea only and does not discuss Similarweb’s data.
The key insight: Similarweb puts Claude at 11.5% of generative-AI website traffic in October 2026, up 1.9 points from September. By our arithmetic, that one-month gain is larger than Claude’s 1.6-point gain over the five months from April to September, while ChatGPT slipped to 55.7% and Gemini to 24.2%.
The post, headed “Gen AI website traffic share update”, lists seven sites at five points in time: November 2025, April 2026, August 2026, September 2026 and October 2026. Its chart shows one bar for each month from November 2025 to October 2026, labelled “All Traffic | Worldwide”, without printed values. Every share in this piece comes from the post’s text.
For October 2026 Similarweb gives ChatGPT 55.7%, Gemini 24.2%, Claude 11.5%, DeepSeek 3.4%, Grok 2.2%, Copilot 1.1% and Perplexity 0.8%. For November 2025 it gives ChatGPT 69.5%, Gemini 15.9%, DeepSeek 4.1%, Grok 3.3%, Perplexity 2.2%, Claude 2.1% and Copilot 2.0%.
Claude’s share of generative-AI website traffic in the months Similarweb itemised: 2.1% (November 2025), 8.0% (April 2026), 9.6% (July), 9.3% (August), 9.6% (September) and 11.5% (October). Data: Similarweb posts on X of 10 November and 12 October 2026 (July from the October post). The +1.9 and +1.6 point changes are our arithmetic.
What Was Posted on X
Gen AI website traffic share update โ October 2026
Similarweb’s own post of 10 November 2026 with its gen-AI website traffic shares for October 2026 and four earlier periods. It is the source of the piece’s October, September, August, April and November 2025 shares; the July figures come from Similarweb’s 12 October update.
How the Seven Moved in October
By our arithmetic, Claude’s 1.9-point gain from September was the largest move of any of the seven sites. ChatGPT lost 0.7 points, Gemini 0.8 and Copilot 0.4. Grok and Perplexity lost 0.1 each. DeepSeek was unchanged at 3.4%.
Gemini’s slide runs back to the summer. Similarweb’s September update put it at 26.6% in July. It then fell to 25.6% in August, 25.0% in September and 24.2% in October. It is still 8.3 points above November 2025, by our arithmetic.
ChatGPT’s October dip follows two monthly rises, from 54.3% in July to 56.4% in September. Its share is 13.8 points below November 2025, by our arithmetic.
The four smaller sites lost ground over the year. DeepSeek, Grok, Copilot and Perplexity together held 7.5% in October against 11.6% in November 2025, by our arithmetic. Claude alone now has more than the four combined.
A Different 81% Figure
Business Insider reported on 9 November that ChatGPT accounts for “more than 81% of traffic to six major AI chatbots”, citing a study by Graphite, a research and growthmarketing firm. That is a different measure from Similarweb’s update.
According to Business Insider, “The research analyzed worldwide web and mobile-app traffic using Similarweb data”, and the record monthly visits it cites for ChatGPT are for September. Similarweb’s own update covers website traffic only, across seven named sites, and runs to October. We did not read Graphite’s report itself.
Connecting the Coverage
The share figures point the same way as Similarweb’s ranks. On 9 November it put Claude up six places to No. 25 among all websites in October, as we reported in Claude Climbs 6 Places to No. 25 as Perplexity Drops 26. A day earlier it ranked chatgpt.com fifth, with 6.048 billion October visits, up 2.15% from September (our piece).
Website traffic is one window on Claude’s use. Another is the paid plans: one developer’s chart put a month of the $200-a-month Ultra plan’s limit at $14,662 of Opus 5.5 at API list prices, on a single account, as we reported in Claude Ultra Limit Measured at $14,662 of Opus 5.5 a Month.
The figures land as Anthropic prepares to list; our IPO map tracks the open questions on price, buyers and risks.
The Structural Read
As we read it, October breaks a flat summer for Claude: Similarweb’s figures had it at 9.6% in July, 9.3% in August and 9.6% in September before the jump to 11.5%.
As we read it, the 10% line Business Insider describes is on Graphite’s web-and-app measure for September; on Similarweb’s website-only measure, Claude’s share went above 10% in October.
Business Insider, 9 November 2026, on Graphite’s study
“No competitor has managed to capture even 10% of the market.”
Three Implications
FOR ANTHROPIC WATCHERS By our arithmetic, Claude’s share is about 5.5 times its November 2025 level, and Similarweb’s ranks put Claude up six places to No. 25 among all websites in October.
FOR GOOGLE Gemini’s share fell for a third month in a row, to 24.2%, though it is still 8.3 points above November 2025, by our arithmetic.
FOR OPENAIChatGPT still holds more than half of the gen-AI website traffic Similarweb tracks, at 55.7%, but that is 13.8 points below November 2025, by our arithmetic.
The framework says: “User counts and message volume no longer capture how AI is being used.” and “The meaningful metric is work completed rather than conversations initiated.”
As we read it, website share sits on the conversation side of that line: it counts visits to Claude’s site, not the work run through the API or coding tools. The framework predates Similarweb’s October figures and does not discuss them.
What Is Not Established
Similarweb’s shares are estimates of website traffic. The update says nothing about use through apps, the API or coding tools, and it does not measure paid users or revenue. The post does not explain why Claude’s share rose in October. One month is not a trend: Claude’s share dipped from 9.6% in July to 9.3% in August before rising again. The chart’s bars for the months the text does not list carry no values, so we do not use them.
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Similarweb puts Claude at 11.5% of generative-AI website traffic in October 2026, up 1.9 points in a month. By our arithmetic, that is more than its 1.6-point gain over the five months from April to September, while ChatGPT and Gemini both slipped and Gemini fell for a third month in a row.
A note on sourcing. Every share is from Similarweb’s own posts on X of 10 November and 12 October 2026, which are Similarweb estimates of website traffic. The Graphite figures are as reported by Business Insider; we did not read Graphite’s report. All changes, multiples and gaps are our arithmetic.
Gennaro Cuofano is a CRO and tech executive who has worked in AI since late 2015, starting with bringing NLP, natural-language generation, voice and chatbot products to the marketing industry. His background is in law and finance: he holds a Master's degree in Law and an International MBA with an emphasis on corporate finance (LUISS Business School and the University of San Diego, 2012), and worked as a financial analyst at a real-estate investment firm in San Diego and as an assistant controller. His work focuses on business model strategy, business engineering and, more broadly, structural analysis: how companies make money, read from their own filings. He created FourWeekMBA and leads research there and at The Business Engineer, his newsletter on AI and business strategy, with over 95,000 subscribers and more than 1,000 published analyses. His writing has also appeared on Entrepreneur (for example, How to Digitize a Family Business in Europe) and HackerNoon. Find him on LinkedIn and Substack. See how we source.
