Dec 2025 AI share ranking
A monthly report of AI chatbot market share and usage worldwide and in Japan as of Dec 2025, with month-over-month change and fastest risers/fallers.
A. The bottom line for Dec 2025
Worldwide #1 is ChatGPT (about 79.8%).The fastest riser is Google Gemini (MoM +1.76pt).
Worldwide share (Dec 2025)
| # | AI tool | Worldwide share | Share ratio | MoM | Trend |
|---|---|---|---|---|---|
| 1 | ChatGPT OpenAI | 79.75% | ▼2.10 | ||
| 2 | Perplexity Perplexity AI | 10.83% | ▼0.23 | ||
| 3 | Google Gemini | 4.73% | ▲1.76 | ||
| 4 | Microsoft Copilot Microsoft | 3.60% | ▲0.55 | ||
| 5 | Claude Anthropic | 1.07% | ▲0.01 | ||
| 6 | DeepSeek DeepSeek | 0.02% | ▲0.01 |
▲ Gained share
Google Gemini▲1.76
Microsoft Copilot▲0.55
Claude▲0.01
▼ Lost share
ChatGPT▼2.10
Perplexity▼0.23
Claude▲0.01
Worldwide share history through Dec 2025
Japan share (Dec 2025)
| # | AI tool | Japan share | Share ratio | MoM |
|---|---|---|---|---|
| 1 | ChatGPT OpenAI | 73.91% | ▼9.26 | |
| 2 | Google Gemini | 11.31% | ▲6.45 | |
| 3 | Microsoft Copilot Microsoft | 6.82% | ▲2.23 | |
| 4 | Perplexity Perplexity AI | 6.75% | ▲0.71 | |
| 5 | Claude Anthropic | 1.17% | ▼0.17 | |
| 6 | DeepSeek DeepSeek | 0.03% | ▲0.03 |
Source: StatCounter Global Stats (AI Chatbot Market Share) ／ Captured: 2026-06-03 ／ reference value
Frequently asked questions
Which AI had the highest share in Dec 2025?
ChatGPT, with a worldwide market share of about 79.8% (StatCounter).
Which AI gained the most in Dec 2025?
Google Gemini gained the most, at MoM +1.76pt.
⚠ 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.