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.
A. The bottom line for May 2026
Worldwide #1 is ChatGPT (about 79.1%).The fastest riser is ChatGPT (MoM +2.20pt).
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 |
▲ Gained share
ChatGPT▲2.20
Claude▲0.33
DeepSeek±0
▼ Lost share
Google Gemini▼1.96
Microsoft Copilot▼0.51
Perplexity▼0.06
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: 2026-06-03 ／ reference value
Frequently asked questions
Which AI had the highest share in May 2026?
ChatGPT, with a worldwide market share of about 79.1% (StatCounter).
Which AI gained the most in May 2026?
ChatGPT gained the most, at MoM +2.20pt.
⚠ 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.