Stanford's 2026 AI Index Report, compiled by the Stanford Institute for Human-Centered Artificial Intelligence, finds that United States based organizations released 50 notable AI models in 2025, more than any other country tracked by the research group Epoch AI. The report's research and development chapter shows industry, rather than universities or government labs, now drives almost all of that output.

Industry produced more than 90% of the world's notable AI models in 2025, up from about 60% in 2023, according to the report. Academic institutions still lead in one measure: their research papers draw the most citations even as company labs pull ahead in the number of models actually released and shipped to the public.

The shift shows up in how American businesses spend money on AI tools. A separate analysis of business adoption found that OpenAI holds the largest share of paid AI usage among US companies at 35%, while Anthropic has climbed to roughly 30% in just over a year on the strength of coding and workplace tools such as Claude Code. Google and xAI make up most of the remaining paid share tracked since January 2023.

The Stanford report also found that organizational AI adoption kept climbing worldwide, with 88% of surveyed organizations now using AI in some form and 70% using generative AI in at least one business function. The report noted a separate concern for the United States: the number of AI researchers and developers moving into the country has dropped 89% since 2017, even as domestic model output rises.

Source: Stanford HAI AI Index - https://hai.stanford.edu/ai-index/2026-ai-index-report/research-and-development