ChatGPT holds an 81.2 percent to 81.4 percent share of worldwide AI chatbot sessions and traffic as of September/October 2026, bouncing back from a mid-2026 dip.
For some, that might suggest that the frontier model market, contested rather than established, still favors OpenAI, at least in some portions of the market, such as consumer and general uses rather than enterprise or coding.
And many suggest other sources of value can emerge, including applications, orchestration, data, and vertical solutions, which is why some analysts might favor Anthropic’s enterprise focus.
Surveys and usage data often show OpenAI, Anthropic, and Google accounting for 80 percent to 90 percent of enterprise API/model spend. Open-weight/open-source models have closed many gaps and exert pricing pressure, but they have not fully displaced closed frontier systems for the highest-capability workloads.
According to data compiled by Graphite and Similarweb for recent months ending September 2026, market share remains dominated by ChatGPT:
ChatGPT (OpenAI): ~81.2 percent to 81.4 percent
Claude (Anthropic): ~6.8 percent to 7.2 percent (surged over 1,900 percent year-over-year in sessions)
Gemini (Google): ~4.9 percent to 5.0 percent (up 182 percent year-over-year)
DeepSeek: ~4.0 percent
Grok (xAI): ~1.9 percent
Perplexity: ~0.9 percent.
ChatGPT holds roughly an 80.68 percent share of U.S. chatbot sessions, recovering from a low of 79.64 percent in June 2026.
On desktop/browser pageviews tracked by StatCounter Global Stats, ChatGPT sits at 51.58 percent globally (and 37.10 percent in the U.S.), while Google Gemini tracks at 28.86 percent globally (and 35.42 percent in the U.S.).
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