Claude’s market share more than doubled in March — here’s why users actually left ChatGPT
Summary Claude’s US market share more than doubled in March and has tripled since January. ChatGPT still dominates (~68% US share, according to Statcounter) but lost about 7% in March as rivals gained ground. Many users switched to Claude after controversy around OpenAI’s government deal. Early in March 2026, we saw something remarkable happen in the AI landscape. Following the announcement of OpenAI’s deal with the US government, Anthropic’s Claude chatbot saw a huge surge in both press and app downloads. Users called for abandoning ChatGPT in favor of Claude. Now, with March market share numbers available (via Statcounter), it’s become clear that this was more than just talk. Claude’s share of the US market more than doubled over the month, while ChatGPT’s share dropped noticeably over the same period. The AI controversy of March 2026 Did OpenAI sell out? The drama all started when Anthropic, the company behind Claude, turned down a contract with the US government. Following this announcement, OpenAI, the makers of ChatGPT, quickly signed their own deal. The backlash was almost …



