Claude topped South Korea's paid generative AI market in March 2026 for the first time, recording 49.5 billion won ($33.6M) in domestic credit-card transactions versus ChatGPT's 47.2 billion won, per Korea Economic Daily card payment data. Corporate card transactions accounted for 61% of Claude's South Korea payments — 16 percentage points higher than ChatGPT's ratio — indicating enterprise adoption is driving the gap. OpenAI Korea disputed the data, arguing that large enterprise contracts typically settle by invoice rather than corporate card, and that Samsung SDS has signed more than 10 ChatGPT Enterprise clients whose spending would not appear in card figures.