May 2026 AI share ranking
A monthly report of AI chatbot market share and usage worldwide and in Japan as of May 2026, with month-over-month change and fastest risers/fallers.
Worldwide share (May 2026)
| # | AI tool | Worldwide share | Share ratio | MoM | Trend |
|---|---|---|---|---|---|
| 1 | ChatGPT OpenAI | 79.06% | ▲2.20 | ||
| 2 | Perplexity Perplexity AI | 7.67% | ▼0.06 | ||
| 3 | Google Gemini | 7.03% | ▼1.96 | ||
| 4 | Microsoft Copilot Microsoft | 3.24% | ▼0.51 | ||
| 5 | Claude Anthropic | 2.99% | ▲0.33 | ||
| 6 | DeepSeek DeepSeek | 0.01% | ±0 |
Worldwide share history through May 2026
Japan share (May 2026)
| # | AI tool | Japan share | Share ratio | MoM |
|---|---|---|---|---|
| 1 | ChatGPT OpenAI | 66.21% | ▲7.35 | |
| 2 | Google Gemini | 16.83% | ▼4.35 | |
| 3 | Microsoft Copilot Microsoft | 10.00% | ▼2.12 | |
| 4 | Claude Anthropic | 3.66% | ▲0.14 | |
| 5 | Perplexity Perplexity AI | 3.19% | ▼1.13 | |
| 6 | DeepSeek DeepSeek | 0.11% | ▲0.10 |
Source: StatCounter Global Stats (AI Chatbot Market Share) ／ Captured: 2026-05 ／ reference value
#1 and #2 by region in May 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 67.1% | Microsoft Copilot 10.8% | 56.2 pt |
| United Kingdom | ChatGPT 70.2% | Microsoft Copilot 10.1% | 60.0 pt |
| Germany | ChatGPT 74.8% | Google Gemini 8.3% | 66.5 pt |
| South Korea | ChatGPT 63.7% | Google Gemini 17.0% | 46.7 pt |
| India | ChatGPT 79.8% | Google Gemini 9.3% | 70.5 pt |
AI price changes in May 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 |
|---|---|---|---|---|
| May 19, 2026 | Google AI Ultra (20x) | Price cut | $249.99 → $199.99 | Source |
| May 19, 2026 | Google AI Ultra | New plan | $99.99 | 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 May 2026?
Which AI gained the most in May 2026?
In which regions was an AI other than ChatGPT #1 in May 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.