ChatGPT's traffic share fell from 71.8% to 56.4% in a year, Similarweb data shows
gaganghotra_ · x · 2026-10-12
Similarweb's Gen AI traffic share update for September 2026 shows a reshuffled market over 12 months:
- ChatGPT: 71.8% → 56.4%, though it has stabilized around 54–56% in recent months
- Gemini: 13.6% → 25.0%, nearly doubling to a solid #2
- Claude: 2.3% → 9.6%, the biggest gainer, now #3 ahead of DeepSeek
- DeepSeek: 4.1% → 3.4%; Grok: 2.8% → 2.3%; Copilot: 2.0% → 1.5%; Perplexity: 2.5% → 0.9%
The market has shifted from one-player dominance to a ChatGPT+Gemini duopoly, with Claude as the year's biggest riser.
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