Usage of AI assistants
ChatGPT has the largest share of web traffic to generative AI sites, 56.4%, ahead of Gemini (25.0%) and Claude (9.6%). Share of web traffic to generative AI sites and share of tokens processed on OpenRouter, the developers' platform. Published alongside the Celsius score, outside the score.
Share of web traffic of AI assistants, September 2026
Share of visits to generative AI sites, worldwide, September 2026; alongside, the share of tokens on OpenRouter
- 1
ChatGPTOpenAI · United States56.4 %18.8 % - 2
GeminiGoogle · United States25.0 %14.4 % - 3
ClaudeAnthropic · United States9.6 %5.7 % - 4
DeepSeekDeepSeek · China3.4 %29.8 % - 5
GrokSpaceX Super Intelligence · United States2.3 %- - 6
CopilotMicrosoft · United States1.5 %- - 7
PerplexityPerplexity · United States0.9 %- 
Meta AIMeta · United Statesnot measured1.5 %
VibeMistral AI · Francenot measured2.2 %
QwenAlibaba · Chinanot measured5.6 %
Developers: the detail is in the Table tab.
Similarweb, generative AI sites, September 2026; OpenRouter, week of 26/10/2026. CC BY 4.0 licence.
Detail of the 2 measurements
Web traffic
Share of visits to generative AI sites, September 2026; alongside, the share for October 2025.
- ChatGPT56.4 %In October 2025: 71.8%.
- Gemini25.0 %In October 2025: 13.6%.
- Claude9.6 %In October 2025: 2.3%.
- DeepSeek3.4 %In October 2025: 4.1%.
- Grok2.3 %In October 2025: 2.8%.
- Copilot1.5 %In October 2025: 2.0%.
- Perplexity0.9 %In October 2025: 2.5%.
- Meta AI-Mostly in WhatsApp, Instagram and Messenger: outside the record of websites.
- Vibe-Outside the Similarweb record of AI sites.
- Qwen-Outside the Similarweb record of AI sites.
"Rankings" series on the Éclairages blog
All articles on AI →
Blog article ↗environmentWhich AIs pollute the most?10Grok139Qwen338Meta AI37environment score out of 100, the 3 lowest4 November 2026 · 12 min read
Blog article ↗ethicsWhich AI is the most ethical?1Claude772Copilot583ChatGPT52ethics score out of 1004 November 2026 · 13 min read
Blog article ↗Celsius scoreWhat are the best AIs of 2026?1Claude742Gemini713ChatGPT62Celsius score out of 1004 November 2026 · 11 min read
Blog article ↗useWhich AIs are the most used?1ChatGPT56.4 %2Gemini25.0 %3Claude9.6 %share of web traffic, September 20264 November 2026 · 12 min readContinue in the ranking
The full ranking →Comparison2 AI assistantsChatGPT or Gemini56.4% against 25.0%share of web trafficThe top 2 of the category, on each score and each criterion.The comparison →
UsesThe hub's uses topic: the summary, charts and figures.The topic →AssistantChatGPT62out of 100, 3rd out of 101st in web traffic: its scores, its plans, its models.The entry →The hub newsletter
This month's ranking, news on the impact of AI and one figure from the AI Impact Database. One newsletter a month at most, free of charge. Past issues
