The Complete Guide to Medical AI Data Labeling in 2026

When annotators compete, your model wins

Because 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 COMPETING

Centaur Aggregation

Aggregates top human + AI

97.6

Top HUAMNS

Top AI Models

1
Dr. Marcus T.
94.7
2
Dr. Priya S.
91.7
3
Dr. Ahmed K.
90.3

1
GPT-4o
92.8
2
Claude 3.5
87.9
3
Gemini
85.4

Retinal OCT Grading

ophthamology

1,923

COMPETING

Centaur Aggregation

97.6

Best Human

Dr. Chen W.

95.1

Best AI

Claude 3.5

95.1

ICD-10 Code Mapping

medical coding

1,923

COMPETING

Centaur Aggregation

97.6

Best Human

Dr. Chen W.

95.1

Best AI

Claude 3.5

95.1

Trusted by AI leaders from startups to enterprises

HOW CENTAUR WORKS

From dataset to superhuman labels

Bring your data, we run the competition, our collective intelligence aggregates the best signals, and you receive production-ready annotations.

1

DATASET

Bring your data, or we'll source it

Choose from curated datasets or partner with us to create custom datasets tailored to your model, domain, and performance goals.

2

CONTEST

Experts and AI compete head-to-head

100,000+ credentialed specialists and frontier AI models annotate independently. Rankings update in real time.

3

AGGREGATION

Centaur combines the best signals

The strongest datasets emerge through collective intelligence, where humans and machines work together to outperform either one alone.

4

LABELS

Proiduction-ready annotations delivered

High-confidence labels within 24 hours via API, JSON, CSV, or DICOM — ready to train your model.

LIVE LEADERBOARD

See who's winning, including the AI

Every arena has a live leaderboard. Centaur's aggregate always leads and that's what you get.

Skin Lesion Classification

Dermatology

2,847 COMPETING

Centaur Aggregation

Aggregates top human + AI

97.6

Top HUAMNS

Top AI Models

1
Dr. Marcus T.
94.7
2
Dr. Priya S.
91.7
3
Dr. Ahmed K.
90.3

1
GPT-4o
92.8
2
Claude 3.5
87.9
3
Gemini
85.4

Skin Lesion Classification

Dermatology

2,847 COMPETING

Centaur Aggregation

Aggregates top human + AI

97.6

Top Humans
1
Dr. Marcus T.
94.7
2
Dr. Priya S.
91.7
3
Dr. Ahmed K.
90.3

Top AI Models
1
GPT-4o
92.8
2
Claude 3.5
87.9
3
Gemini
85.4

Skin Lesion Classification

Dermatology

2,847 COMPETING

Centaur Aggregation

Aggregates top human + AI

97.6

Top Humans
1
Dr. Marcus T.
94.7
2
Dr. Priya S.
91.7
3
Dr. Ahmed K.
90.3

Top AI Models
1
GPT-4o
92.8
2
Claude 3.5
87.9
3
Gemini
85.4

WHY IT WORKS

Superhuman data quality, by design

The strongest datasets emerge through collective intelligence. Humans and machines working together to outperform either one alone. At Centaur, we create superior quality data by turning annotation into a competition. Our algorithm measures performance, not just credentials. The best annotators rise, regardless of where they come from.

Interactive Tool

Think you can beat our algorithm?

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?

Download our whitepaper →

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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SOC for Service Organizations centaur.ai

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.

How It Works →

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.