The Complete Guide to Medical AI Data Labeling in 2026

When annotators compete, your model wins

The best AI models aren't built with human data alone — they're built with superhuman data. They're not evaluated by a single expert or judged by a single model, but shaped through the collective intelligence of humans and AI working together.

The best data is made by centaurs. And the best AI teams build with Centaur.ai.

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Skin Lesion Classification

Dermatology

2,847 COMPETED

Centaur Aggregation

Aggregates top human + AI

92.1

Top HUMANS

Top AI Models

1
Dr. Tom Reeves
91.4
2
Dr. James Okafor
90.8
3
Dr. Maria Lopez
90.7

1
GPT-5.5
90.8
2
Claude Opus 4.7
87.9
3
Gemini 3.1 Pro
85.4

Retinal OCT Grading

ophthamology

4,778

COMPETed

Centaur Aggregation

96.8

Best Human

Dr. Alan Park

95.1

Best AI

Claude 4.7

96.2

ICD-10 Code Mapping

medical coding

306

COMPETed

Centaur Aggregation

90.5

Best Human

Dr. Nina Patel

89.2

Best AI

Llama 4 Maverick

85.1

*AI model scores are representative and may not reflect actual results. Specialist names are anonymized to protect privacy.

Trusted by AI leaders from startups to enterprises

HOW CENTAUR WORKS

From raw data to frontier AI

1

DATASET DESIGN

Bring your raw data and your problem... or just your problem

If you don't have the right raw data to start with, we do. Either way, we'll work with you to design the best datasets to accomplish your goals

2

COMPEITIONS

Experts and AI compete

Select from 100,000+ subject matter experts and/or AI models and have them annotate independently. We continually measure - and reward them - based on performance.

3

AGGREGATION

Centaur combines the best signals

We trust annotators - whether human or AI - based on their performance and combine the best of each to outperform either alone.

4

DEPLOY

Superhuman dataset delivery

Production-ready data delivered via API, JSON, CSV, or DICOM - ready for you to train and/or evaluate your model.

Interactive Tool

Think you can beat Centaur data?

Test your labeling strategy with our interactive quality playground. Then see how Centaur helps optimize the result.

Adjust your mix in real-time
Visualize cost vs. accuracy
Compare with Centaur's optimization

Test Your Strategy

Frustrated by your labeling results?

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Build a scalable and accurate medical data labeling pipeline

Security and
compliance you can trust

With leading security and privacy practices in place, you can rest assured we are handling your data with care.

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TESTIMONIALS

What our customers say

“The Centaur.ai platform provided labels at a scale 10x, or 20x, anything we had done by ourselves. Tremendous scale, tremendous throughput, and high-quality labels.”

Daniel Barbosa

Daniel Barbosa

Machine Learning Engineer

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“We found ~5,000 potential new synonyms for the indication and anatomy vocabularies, but curating that many terms manually would have taken months of dedicated work”

Mark Streer

Mark Streer

Scientific Coordinator

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“We were able to improve our model dramatically - from .6 to .83 F1 score - in part, because of Centaur.ai.”

Fausto Milletarì

Fausto Milletarì

Sr. AI Scientist

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What we annotate

TEXT

AUDIO

IMAGE

VIDEO

Audio Waveform

WAVE

industries

Industries building with Centaur.ai

Medical Device

From software as a medical device (SaMD) to next generation AI-enabled hardware devices.

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Life Sciences

From accelerating drug discovery to leveraging real world evidence.

How It Works →

Consumer

From skin matching AI for cosmetics, to AI-enabled wellness applications.

How It Works →

Insurance

From accelerating claims processing and reimbursement, to improving customer service.

How It Works →

LLMs and Software

From chatbots answering patient questions to expert review on LLM hallucinations.

How It Works →

Accelerate your AI development today.