According to CNBC's analysis of House spending records, U.S. House of Representatives offices spent at least $113,740 on identifiable AI tools in the year ending March 31, 2026, with OpenAI's ChatGPT accounting for $100,580, or approximately 88% of that total. At least 70 House offices used AI tools, with Democrats leading in visible spending. As lawmakers weigh AI regulation, OpenAI, Anthropic, Google, and Microsoft are vying for influence in Washington.