Similarweb data shows ChatGPT still dominates AI chatbot website traffic and has recently regained share, climbing from 52.7 percent three months ago to 55.5 percent. Google Gemini, after a strong comeback, is slipping again from 27.8 to 25.6 percent. Year-over-year ChatGPT has lost significant ground (down from 73.3 percent), while Gemini doubled its share and Anthropic's Claude grew from 1.9 to 9.3 percent. DeepSeek (3.4 percent), Grok (2.4 percent), Copilot (1.6 percent), and Perplexity (0.9 percent) remain bit players.

These figures cover website traffic only. Google likely drives many mobile Gemini interactions through its Android ecosystem that don't show up here, sending push notifications that open the Gemini app directly with a summary instead of a web link. OpenAI is also pushing its mobile ChatGPT app and the new desktop version ChatGPT Work, neither of which appear in the stats.
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