Foundation Model Transparency Index
Summary
A comprehensive assessment scoring 13 foundation model developers on transparency indicators, noting a general decrease in transparency scores in 2025 compared to previous years.
Key quotes
Companies score worse this year. The mean score this year is 41: this is a 17 point decrease over the previous year.
IBM receives the highest score across all three years.
Openness correlates with—but isn't sufficient for—transparency.
The 2025 Foundation Model Transparency Index evaluates 13 companies, including new additions like DeepSeek and xAI. It identifies a significant decline in average transparency scores and highlights persistent opacity regarding training data and model architecture.