Mercor vs Scale AI

Mercor — Application · Private · $20B valuation · 4 of 4 figures sourced  |  Scale AI — Infrastructure · Private · $29B valuation · 3 of 3 figures sourced

Relationship

Both are expert-workforce training-data services for AI labs, named together on Prolific's own Mercor-alternatives page.

2 of 2 capabilitiesShared product typeSame scale bandSourced competitorTrain or fine-tune a model

2 of 2 capabilities — Shares data labelling and evaluation and observability.

Ludbee capability tags · from the product records

Shared product type — Both ship data service.

Ludbee product records

Same scale band — Both late-stage private.

Ludbee scale bands · from valuation and funding figures

Sourced competitor — “Scale AI and Surge AI represent the most direct competitors, offering comprehensive services in AI data annotation and expert talent sourcing.”

sacra.com · checked 2026-09-19

Train or fine-tune a model — Rivals on this job — Adapt a base model to a domain, or train one from scratch — the platforms, capacity and tooling that job needs.

Ludbee needs vocabulary · the scope on the sourced edge

Aligned comparison

FieldMercorScale AI
Valuation$20B$29B Scale AI has 45% more
Employees2651,300 Scale AI has 4.9× more
Founded20232016 7 yrs earlier
StatusPrivatePrivate match
CategoryApplicationInfrastructure
Stack layerData serviceData service, Platform
HeadquartersSan Francisco, USASan Francisco, USA match

Capability overlap

Shared · 2

Data labellingEvaluation and observability

Not verified for Mercor · 2

Data analysisKnowledge retrieval

Recorded for Scale AI. Mercor’s product records say nothing either way — a missing record is not a missing capability.

Mercor has no capability Scale AI lacks, among the 2 recorded here.

Products, side by side

Hand-checked pairing

Mercor

Data service

Mercor DataData service

A service that sources real enterprise workflow data from partner organisations for frontier AI training, in exchange for analysis of where AI can help those organisations.

Mercor Enterprise EvalsData service

Expert-built evaluations of a customer's own AI agents, measuring whether they work and what they cost to run.

Mercor for EnterpriseData service

Recruits and manages domain experts who produce training data and evaluations for AI labs.

Off-the-shelf DataData service

Pre-built, peer-reviewed AI post-training datasets (APEX-Agents, SWEBench Ext., TerminalBench, BrowseComp and more) available for immediate licensing to AI labs.

Scale AI

Data service

Scale Data EngineData service

Data labelling and curation service producing training and evaluation sets for AI models.

No counterpart

Scale AI sells these in a stack layer with no product recorded for Mercor yet — nothing on the other side to compare them against.

Platform

Scale DonovanPlatform

AI platform for defence and intelligence users, for searching, summarising and reasoning over operational data.

Scale GenAI PortfolioPlatform

Platform for building and evaluating enterprise generative-AI applications against a customer's own data.

Open in the browser view