What it is
Defined.ai connects AI builders to annotated, compliance-focused datasets across modalities. It is broader and older than many generative-AI-specific entrants, with an established marketplace model for training and fine-tuning data.
Limitations
Defined.ai is a broad commercial data marketplace rather than a rights standard or publisher-specific initiative.
Evidence trail
- Jan 27, 2026 Defined.ai reports 2025 marketplace growth
Adoption signals
Payments
several partners generate $1M+/year
- Defined.ai reports 2025 marketplace growth Jan 27, 2026