Do AI Companies Make Good on Voluntary Commitments to the White House?

Voluntary commitments are central to international AI governance, as demonstrated by recent voluntary guidelines issued from the White House to the G7, from Bletchley Park to Seoul. But do AI companies actually make good on their commitments? We score 16 companies based on their publicly disclosed behavior by developing a detailed rubric based on their eight voluntary commitments to the White House in 2023. We find significant heterogeneity: while the highest-scoring company (OpenAI) scores 83\% overall on our rubric, the average score across all companies is just 52\%. The companies demonstrate systemically poor performance on their commitment to model weight security, with an average score of 17\%: 11 of the 16 companies receive 0\% for this commitment. Our analysis highlights a clear structural shortcoming that future AI governance initiatives should correct: when companies make public commitments, they should proactively disclose how they meet their commitments to provide accountability, and these disclosures should be verifiable. To advance policymaking on corporate AI governance, we provide three directed recommendations that address underspecified commitments, the role of complex AI supply chains, and public transparency that could be incorporated into AI governance initiatives worldwide.