AI Training Data Companies

Licensed data

Start here if the data may already exist

Licensors hold material someone else created: publisher archives, web content, support histories, recordings. You pay for permission, not labor, so the price turns on size, uniqueness, exclusivity and term.

Collective licenses such as Copyright Clearance Center's AI Systems Training License cover many rightsholders at once; company-data offerings such as Labelbox Prism license operational data from individual firms, exclusive by default.

Listed: Appen, Centific, Copyright Clearance Center, Labelbox Prism, RSL Collective and others. Open the Licensed data section of the directory.

Marketplaces

For standard datasets with a listed price

Marketplaces let independent providers list data and set their own terms. They suit tabular and commercial datasets more than bespoke training sets, and the marketplace usually takes its cut from the provider: AWS Data Exchange charges providers a 3% listing fee on public offers.

Listed: AWS Data Exchange, Databricks Marketplace, Datarade, Defined.ai, Prolific and others. Open the Marketplaces section of the directory.

Annotation

When you hold raw data that needs labels

Labeling companies split into platforms (you bring annotators, they bring software) and managed services (they bring both). Rates are seldom public. Two exceptions: a box drawn by Label Your Data starts at two cents, and Segments.ai's entry plan comes to $2.67 for each hour of labeling.

Listed: CloudFactory, Dataloop, Encord, HumanSignal (Label Studio), Keymakr and others. Open the Annotation section of the directory.

Expert and RLHF

When people with expertise must create it

Post-training data for language models and agents comes from networks of domain experts who write demonstrations, rank outputs and build tasks with graders. RL environment builders recreate software such as CRMs and ticketing tools so agents can practice in them.

Buyer prices here are almost never public. People Epoch AI interviewed said one graded RL task usually lands somewhere from $200 up to $2,000, and that exclusivity multiplies the bill about fourfold or fivefold.

Listed: Bespoke Labs, Halluminate, Handshake AI, Innodata, Mercor and others. Open the Expert and RLHF section of the directory.

Synthetic

To fill gaps, protect privacy or scale cheaply

Generators produce tabular records, text or rendered images from seed data, a schema or a 3D scene. They are strongest where real data is scarce or cannot leave a secure system, and weakest where the generator shares the blind spots you want fixed. Rendered.ai is one of few to publish a price: from $5,000 a month.

Listed: Aindo, K2view, MOSTLY AI (Syntho), Parallel Domain, Rendered.ai and others. Open the Synthetic section of the directory.

Evaluation

To prove the data improved the model

Evaluation platforms run test sets against model versions and trace failures in production; red-teaming specialists probe for unsafe behavior. Here, at least, list prices exist: LangSmith charges $39 per seat monthly on Plus, and Braintrust Pro costs $249 monthly.

Listed: Braintrust, Confident AI (DeepEval), Galileo, Giskard, Gray Swan AI and others. Open the Evaluation section of the directory.

Disclosure: any company in this list could end up paying us for an introduction that turns into work. Entries, their sequence and our descriptions are written the same way regardless.

Disclosure: any company in this list could end up paying us for an introduction that turns into work. Entries, their sequence and our descriptions are written the same way regardless.

Published starting rates, not quotes. Read how each model behaves on a real project, or put your own volumes into the cost estimator.