Claude Code · Anthropic · DeepSeek · OpenAI · Gemini · Claude · Decrypt
ChatGPT Is Losing Ground to Rivals—Here Are Some Numbers
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According to SimilarWeb's latest web traffic data, ChatGPT commanded 77.6% of global generative AI website traffic in May 2025.
Key facts
- As Decrypt previously reported, Anthropic's shares on secondary trading platform Forge Global were hovering around $1 trillion —above OpenAI's $880 billion on the same platform
- The Ramp AI Index, which tracks paid AI subscriptions across more than 50,000 U.S. businesses, published its May 2026 update this week
- Anthropic's adoption rose 3.8% in April to 34.4% of businesses; OpenAI fell 2.9% to 32.3%
- According to SimilarWeb's latest web traffic data, ChatGPT commanded 77.6% of global generative AI website traffic in May 2025
Summary
ChatGPT's global web traffic share fell from 77.6% in May 2025 to 53.7% in April 2026, per SimilarWeb. For the first time, Anthropic passed OpenAI in business adoption: 34.4% vs. 32.3% of companies tracked by the Ramp AI Index. Secondary markets are pricing Anthropic at around $1 trillion—above OpenAI's $880 billion on Forge Global. The ground it's ceding isn't going to a single challenger.