Mercor review: the best AI data company for expert-grade data?

Answer in brief: Mercor ranks #3 because it gets you credentialed professionals, including physicians, lawyers, engineers and consultants, building data, rubrics and evaluations fast. Its site cites 5M+ experts and $4M+ in daily payouts. For data buyers, Mercor also sells off-the-shelf data and helps companies monetize their own data, so it now spans both sides of the AI data economy. In October 2025 it raised a $350 million Series C at a $10 billion valuation, led by Felicis Ventures. Expert rates make simple, high-volume work expensive, and buyer pricing is not published.

At a glance: Rank #3 of 14 · Best for: domain-expert evaluations and post-training data · Pricing: custom · Funding: $350M Series C at $10B led by Felicis (October 27, 2025).

What Mercor does for AI data buyers

Mercor recruits and vets professionals to create training data, evaluations and RL environments for AI labs and enterprises. Beyond custom programs, its site markets off-the-shelf data and data monetization. It also publishes the APEX benchmarks, built with partners including Harvey, Cognition and Sierra, which measure how models perform on real professional work.

Who it fits

It fits labs and enterprises that need expert judgment in law, finance, medicine, engineering or software; teams building rubric-graded evaluations; and data owners exploring monetization. Teams that need cheap, simple labels at volume should look at Toloka or Prolific.

Why buyers put Mercor on the shortlist

• Scale of expertise. 5M+ experts, a $90/hour average contracted rate and $4M+ in daily payouts (company-stated).
• Speed. A recruiting engine built to staff specialist projects quickly.
• Benchmark credibility. The APEX benchmarks are built with recognized AI-native companies.
• Two-sided data business. Off-the-shelf data for buyers and monetization for data owners.
• Heavy backing. CNBC and TechCrunch reported a $350 million Series C at a $10 billion valuation on October 27, 2025, led by Felicis Ventures with Benchmark, General Catalyst and Robinhood Ventures participating. TechCrunch said the round quintupled its valuation.

Honest drawbacks

• Buyer pricing is not published.
• Expert-level rates make high-volume, simple labeling expensive.
• Its scope now spans recruiting, human data, data monetization and enterprise AI deployment, so confirm which team owns your program.
• Network and payout figures are company-reported.

Pricing model

Custom. Expert pay rates are visible on its public role listings, which helps you estimate costs.

Best alternatives

• Surge AI: premium frontier data with pay-if-it-works datasets.
• Handshake AI: large US graduate and PhD pools.
• Turing: coding and STEM post-training data.

For labor-led programs in depth, see Best AI training data providers.

FAQ

How many experts does Mercor have?

Mercor's site cites 5M+ experts and a $90/hour average contracted rate.

Does Mercor sell datasets?

Yes. Its site markets off-the-shelf data and data monetization alongside custom programs.

What is Mercor's valuation?

$10 billion, set by a $350 million Series C led by Felicis Ventures in October 2025.

Did you test Mercor?

No. This review is independent research from Mercor's site and dated reporting.

Sources

• Mercor homepage (retrieved November 9, 2026)
• CNBC: AI startup Mercor now valued at $10 billion with new $350 million funding round (October 27, 2025)
• TechCrunch: Mercor quintuples valuation to $10B with $350M Series C (October 27, 2025)

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