Mercor review: the professional-expert training data company
Answer in brief: Mercor supplies AI training data and evaluations from professionals: physicians, lawyers, engineers and consultants. It says its network has 5M+ experts. It builds benchmarks and RL environments based on real professional work (APEX) and also helps businesses sell their own workflow data. Choose it when your model has to perform real professional work. This is independent research; we did not test Mercor hands-on.
Top pick for: legal, finance, medical, engineering and software data, and evaluation judged against professional standards. Visit Mercor →
Where Mercor sits in the directory
Category: human data and expert post-training. Its data-monetization program also puts it in the marketplace category for businesses with data to sell.
What it does for AI training data
- Human data and evals from a network of 5M+ experts.
- APEX benchmarks and RL environments built on real work, including APEX-Agents, APEX-Accounting and APEX-SWE (built with Cognition).
- Partner benchmarks such as Harvey LAB: 1,749 attorney-built legal tasks across 24 practice areas.
- Off-the-shelf data and a robotics offering.
- Data monetization: businesses can license their workflow data, with automated anonymization of 60+ categories of identifiers.
Who it fits
Frontier labs and enterprises whose models must meet a professional bar, and companies that want to earn money from their own data.
Why buyers pick Mercor
- Expert depth at volume. Mercor reports a $90/hr average contracted rate and $4M+ in daily payouts. That signals the calibre of contributor, not just the size of the crowd.
- Credible benchmarks built with industry partners.
- Momentum. CNBC reported a $10B valuation in October 2025. Powerlaw attributes a $2B gross annualized run rate in June 2026 to The Information.
Honest drawbacks
- The run-rate figure is gross (before contractor payouts) and unaudited.
- Mercor also sells enterprise AI deployment with forward-deployed engineers, so data is not its only focus.
- Expert-hour pricing makes it a premium option.
Pricing
Custom, through sales or its research team.
Best alternatives to Mercor
- Surge AI: premium post-training data with published benchmark gains.
- micro1: expert data plus Realm RL environments.
- Snorkel AI: research-grade specialized datasets.
Mercor FAQ
How many experts does Mercor have?
Mercor says it has 5M+ experts, including physicians, lawyers, engineers and consultants.
What is APEX?
Mercor's family of benchmarks and RL environments built on real professional work, including APEX-Agents, APEX-Accounting and APEX-SWE.
Can my company sell data through Mercor?
Yes. Its data-monetization program licenses workflow data, with automated anonymization, and your organization controls what is shared.