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4 vendors.

• Mercor — Recruits domain experts at scale and turns their work into training data, benchmarks and agent-training tasks for labs and enterprises.
• Perle AI — Routes work from a large international pool of credentialed professionals into AI training and evaluation projects.
• Snorkel AI — Builds specialized datasets, benchmarks and evaluation environments aimed at high-stakes domains for frontier models and agents.
• Vals AI — Independent testing of models on real-world work, publishing benchmarks across coding, finance, law and more.