The OSI,
for AI.
OSAII is the certification body for open AI — and a builder of it. We determine whether models are genuinely open, and publish the verdicts. Open weights or open data qualifies. Both are not required.
Mission
The Open Source Initiative defined what "open source software" means. OSAII does the same for AI: a neutral body that certifies whether models are open against a clear, public standard — and releases its own open models where the ecosystem needs them.
Compatibility: a model is OSAII-compatible when it is open in at least one of the three dimensions below. Verdicts are published, versioned, and never for sale.
Compatibility tiers
The model weights are publicly available.
The training and/or inference code is publicly available and reproducible.
The training dataset (or a reproducible equivalent) is publicly available.
Meets all three: Open Weights + Open Code + Open Data.