Data compiled by U.S. research firm Similarweb for August 2026 reveals the latest shifts in global web traffic share among generative AI chatbot sites. ChatGPT, the market leader, pushed its share back up to 55.5%, putting a stop to the declining trend it had shown in prior months. Meanwhile, Google Gemini, which had surged sharply in the spring, retreated to 25.6% as its momentum cooled.
This trajectory reflects a generative AI market that has moved rapidly in a short span of time and is now settling into a new equilibrium. Although ChatGPT's once-overwhelming dominance—it commanded 73.3% as recently as summer 2025—has eroded, the market has reorganized into an oligopoly of three major players: ChatGPT, the fast-rising Gemini, and Claude, which grew roughly fivefold year-over-year.
The Rebound to 55.5% and Gemini's Pause
ChatGPT's web traffic share had fallen as low as 52.7% in May 2026, but it has since recovered 2.8 percentage points over the past three months to reach 55.5%. This recovery was underpinned by the strength of ChatGPT as an everyday work platform on PC browsers, with usage habits for weekday business and study tasks now firmly entrenched.
OpenAI's integration of search functionality and the growing adoption of its desktop PC application also helped stem the loss of existing users. Keeping the desktop app running in the background with quick shortcut access eliminated the hassle of reopening a browser mid-task, sustaining the frequency with which users launch ChatGPT during daily work. By consolidating search and chat into a single interface, OpenAI has also built a defensive wall that prevents users from routing their information searches to competitors.
By contrast, Google Gemini has been forced to pause after its rapid expansion earlier in the year. Gemini's web share fell 2.2 percentage points from 27.8% three months ago to 25.6%. Around the Google I/O developer conference, Google had aggressively promoted the large-context processing capabilities of the Gemini 1.5 series along with enhanced free-tier offerings, rapidly attracting users. However, in terms of repeat visits to the browser-based website, the pace at which those newly acquired users have stuck around slowed over the summer.
データを表で見る
| シェア (%) | |
|---|---|
| ChatGPT | 55.5 |
| Gemini | 25.6 |
| Claude | 9.3 |
| DeepSeek | 3.4 |
| Grok | 2.4 |
| Copilot | 1.6 |
| Perplexity | 0.9 |
As the chart above shows, ChatGPT and Gemini together currently account for more than 80% of all web traffic. With ChatGPT hitting bottom and rebounding, the battle for the top spot has moved back toward widening the gap between the two.
The End of Single-Player Dominance and Claude's Fivefold Growth
Taking a longer view, the tectonic shift in market structure becomes even clearer. ChatGPT's share, which stood at 73.3% in the same month a year earlier (August 2025), has contracted by 17.8 percentage points over the past year. The era of unchallenged "ChatGPT dominance," when no real competitor existed, has come to a complete end.
Stepping into that gap and achieving explosive growth is Anthropic's Claude. Claude's web traffic share has surged approximately 4.9-fold (nearly fivefold) from 1.9% a year ago to 9.3% today. Its high processing accuracy in programming and long-document analysis, combined with its "Artifacts" feature that lets users intuitively preview their work on screen, has strongly attracted engineers and knowledge-work professionals.
Claude's canvas feature—which expands beyond simple conversational responses to generate real-time code execution results and structured document displays on the side of the screen—has become an established work environment that directly boosts productivity for hands-on tasks. This high loyalty among professional users has driven organic traffic growth without relying on advertising or flashy promotions.
The combined share of the top three services—ChatGPT at 55.5%, Gemini at 25.6%, and Claude at 9.3%—reaches 90.4%. As each company advances with its own distinct strengths, a clear three-way framework has taken shape: ChatGPT with broad mainstream penetration, Gemini tied to search and the Google ecosystem, and Claude firmly rooted in advanced professional work.
Why the Rest Can't Break the 10% Barrier
While the top three capture more than 90% of traffic, the players ranked fourth and below continue to struggle to gain ground. DeepSeek sits at 3.4%, xAI's Grok at 2.4%, Microsoft Copilot at 1.6%, and Perplexity at 0.9%—and even combined, these trailing services account for only 8.3% of the total, falling short of even a tenth of the market.
Behind the struggles of these trailing services lies the difficulty of differentiating within standalone chatbot feature competition. Neither DeepSeek, which has boosted cost-performance with open-weight models, nor Grok, which leverages its integration with the social platform X, has managed to broaden its base of users who return to the browser as a daily-use tool. The reality is that buzz on social media or in technical communities doesn't necessarily translate into repeated, habitual visits to a website.
Microsoft Copilot's mere 1.6% web traffic share is also notable in this context. While Microsoft has embedded its AI assistant across Windows, Edge, and its Office suite of products, the pathway for users to directly access and use the standalone website (copilot.microsoft.com) remains limited, meaning much of its usage doesn't register in browser visit counts.
The Real Battleground Beyond Browsers, and the Blind Spot of OS Integration
That said, this Similarweb data is limited strictly to "website visit traffic." Actual generative AI usage has already expanded well beyond the browser, and this reality—invisible in the statistics—must be factored in.
The biggest blind spot is mobile apps and OS-level integration. Google is advancing efforts to replace the traditional Google Assistant with Gemini on Android devices. As the mechanism by which the Gemini app launches directly from device notifications and gestures—displaying answers without ever passing through a web link—becomes widespread, much of the usage occurring via Android goes uncounted in web traffic figures.
OpenAI, too, is aggressively pushing mobile app adoption and investing heavily in its dedicated desktop application. Apple's integration allowing Siri to invoke ChatGPT through "Apple Intelligence" is also a major factor driving substantial usage that bypasses browser access altogether. Factoring in usage patterns where developers call models directly via API from coding environments like Cursor, it has become increasingly difficult to judge each company's overall user base from web traffic figures alone.
The primary battleground for generative AI is shifting—from chat interfaces on web browsers to smartphone and PC operating systems, and to each company's own business ecosystem. Whether ChatGPT can sustain the strength it has shown in holding its ground on the web, or whether the giant platform holders that control the operating systems will chip away at that share from outside the browser, remains to be seen. The next axis of competition will hinge on how deeply each player can embed itself into users' daily routines.