Sep 2026 AI share ranking
A monthly report of AI chatbot market share and usage worldwide and in Japan as of Sep 2026, with month-over-month change and fastest risers/fallers.
A. The bottom line for Sep 2026
Worldwide #1 is ChatGPT (about 80.1%).
Worldwide share (Sep 2026)
| # | AI tool | Worldwide share | Share ratio | MoM | Trend |
|---|---|---|---|---|---|
| 1 | ChatGPT OpenAI | 80.08% | — | ||
| 2 | Google Gemini | 11.04% | — | ||
| 3 | Perplexity Perplexity AI | 4.94% | — | ||
| 4 | Microsoft Copilot Microsoft | 2.06% | — | ||
| 5 | Claude Anthropic | 1.86% | — | ||
| 6 | DeepSeek DeepSeek | 0.02% | — |
▲ Gained share
▼ Lost share
Worldwide share history through Sep 2026
Japan share (Sep 2026)
| # | AI tool | Japan share | Share ratio | MoM |
|---|---|---|---|---|
| 1 | ChatGPT OpenAI | 67.44% | — | |
| 2 | Google Gemini | 23.26% | — | |
| 3 | Microsoft Copilot Microsoft | 7.91% | — | |
| 4 | Claude Anthropic | 1.09% | — | |
| 5 | Perplexity Perplexity AI | 0.31% | — | |
| 6 | DeepSeek DeepSeek | 0.00% | — |
Source: StatCounter Global Stats (AI Chatbot Market Share) ／ Captured: 2026-09 （provisional） ／ reference value
The current month is a provisional, month-to-date figure. Month-over-month change and risers/fallers are based on the latest completed month.
Frequently asked questions
Which AI had the highest share in Sep 2026?
ChatGPT, with a worldwide market share of about 80.1% (StatCounter).
Which AI gained the most in Sep 2026?
Calculated for periods that have month-over-month data.
⚠ These rankings are reference values based on public market-share data, web-traffic estimates and editorial research, and do not represent a complete count of every user of each AI tool. Rankings change with the measurement method (web-visit share vs. market share, etc.). Always check each official site for the latest information.