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.
Worldwide share (Sep 2026)
| # | AI tool | Worldwide share | Share ratio | MoM | Trend |
|---|---|---|---|---|---|
| 1 | ChatGPT OpenAI | 80.49% | ▲1.07 | ||
| 2 | Google Gemini | 10.94% | ▲0.02 | ||
| 3 | Perplexity Perplexity AI | 5.82% | ▲1.48 | ||
| 4 | Microsoft Copilot Microsoft | 1.78% | ▼0.99 | ||
| 5 | Claude Anthropic | 0.95% | ▼1.58 | ||
| 6 | DeepSeek DeepSeek | 0.02% | ±0 |
Worldwide share history through Sep 2026
Japan share (Sep 2026)
| # | AI tool | Japan share | Share ratio | MoM |
|---|---|---|---|---|
| 1 | ChatGPT OpenAI | 74.12% | ▲1.68 | |
| 2 | Google Gemini | 16.70% | ▲0.73 | |
| 3 | Microsoft Copilot Microsoft | 6.21% | ▼0.84 | |
| 4 | Perplexity Perplexity AI | 2.01% | ▼0.01 | |
| 5 | Claude Anthropic | 0.89% | ▼1.62 | |
| 6 | DeepSeek DeepSeek | 0.07% | ▲0.06 |
Source: StatCounter Global Stats (AI Chatbot Market Share) ／ Captured: 2026-09 ／ reference value
#1 and #2 by region in Sep 2026
The leading and second AI in each major region other than the world and Japan that month, and the share gap between them.
| Region | #1 | #2 | Gap #1–#2 |
|---|---|---|---|
| United States | ChatGPT 74.9% | Google Gemini 13.4% | 61.5 pt |
| United Kingdom | ChatGPT 79.8% | Google Gemini 10.2% | 69.6 pt |
| Germany | ChatGPT 78.9% | Google Gemini 11.3% | 67.6 pt |
| South Korea | ChatGPT 64.3% | Google Gemini 29.3% | 35.0 pt |
| India | ChatGPT 77.3% | Google Gemini 16.0% | 61.4 pt |
AI price changes in Sep 2026
New plans, price increases and cuts, and discontinued plans announced by major AI tools this month (US prices in USD).
| Date | Plan | Change | Monthly | Source |
|---|---|---|---|---|
| Sep 29, 2026 | ChatGPT Pro ($500) | New plan | $500 | Source |
Only changes confirmed by an official announcement or major tech-press reporting are listed (checked 2026-10-17). Changes that did not affect the price, such as usage limits, are not included.
Frequently asked questions
Which AI had the highest share in Sep 2026?
Which AI gained the most in Sep 2026?
In which regions was an AI other than ChatGPT #1 in Sep 2026?
⚠ 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.