OpenAI’s ChatGPT accounted for about 88% of identifiable House spending on artificial intelligence tools during the year ending March 31, according to a CNBC analysis. ChatGPT purchases appeared in at least 71 House member offices — roughly 1 in 6 — while Democratic offices spent more than three times as much as Republican offices on identifiable AI tools. The figures capture only part of Congress’ AI use but show the technology becoming embedded in legislative research, constituent work and communications as lawmakers debate how the industry should be regulated and overseen. OpenAI CEO Sam Altman spoke with reporters following meetings on Capitol Hill in Washington on June 3, 2026. OpenAI is dominating the first visible wave of artificial intelligence spending inside Congress, with the maker of ChatGPT accounting for roughly $9 out of every $10 spent on identifiable AI tools by House offices, committees and institutional accounts during the year ending March 31, according to a CNBC analysis of House disbursement records.