From letters to the overall grade
How the overall grade works
Each criterion grade converts to grade points: A 4.0, A- 3.7, B+ 3.3, B 3.0, B- 2.7, C+ 2.3, C 2.0, C- 1.7, D+ 1.3, D 1.0, D- 0.7, F 0.0. The five criteria carry equal weight, and the average (the GPA, published with each lab) converts back to a letter at the midpoints: 3.85 and up A, 3.50 A-, 3.15 B+, 2.85 B, 2.50 B-, 2.15 C+, 1.85 C, 1.50 C-, 1.15 D+, 0.85 D, 0.50 D-, below 0.50 F. Plus and minus within a criterion mark where the evidence sits inside a band. There is no curve and no adjustment for size or market share.
What the board does not measure
Limits
The board grades public commitments and public evidence, not how safe any model actually is. It does not measure model capabilities, alignment quality, weight security, military contracts, lobbying, or harms to users such as privacy or mental health. Labs that disclose more can show more problems: a published incident earns credit for disclosure and may count against shutdown, while a lab that discloses nothing earns nothing. Binding Chinese state rules are noted but are not company commitments. Private assurances and unreleased reports are not counted; survey answers count only where FLI published them. Grades reflect documents available on Nov 8, 2026 and will change as labs publish.