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Medicine

OpenMedQ: Broad Open Pretraining for Medical Vision-Language Models

Halil Ibrahim Gulluk, Max Van Puyvelde

Featured July 1, 2026

Original Paper

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Simply

By training a medical AI on a huge, diverse collection of open medical images and text, the authors created a vision-language model that answers questions and classifies images better than many bigger, secret models.

In depth
The paper introduces OpenMedQ, a medical vision-language model pretrained on an unprecedentedly broad and fully-open collection of 14 medical datasets, totaling approximately 3.35 million samples across diverse modalities like pathology, radiology, and microscopy. This extensive and open pretraining enables the model to achieve state-of-the-art performance on several medical visual question answering (VQA) benchmarks and superior classification transfer capabilities, demonstrating that data diversity is a critical lever for medical AI, even with fewer parameters than proprietary models.

Key Takeaways

  • 1
    OpenMedQ achieves state-of-the-art BLEU-1 scores on PathVQA (75.9) and matches VQA-MED (64.5), outperforming significantly larger proprietary models like Med-PaLM M variants on PathVQA.
  • 2
    The vision encoder of OpenMedQ, when transferred to 8 unseen medical classification benchmarks, obtains the highest average macro-F1 (0.757) compared to other strong medical contrastive encoders.
  • 3
    The study highlights that breadth of open pretraining data is a competitive and reproducible lever for developing high-performing medical vision-language models, offering a fully-open baseline for the community.

Conceptual Flow

HIGH LEVEL
1
Methodology: Broad Open Pretraining

The model learns from many different types of medical pictures and questions, all shared openly, to become smart about health data.

Many Medical Images
Many Medical Texts
Learn Connections
Smart Medical AI Model
2
Results: Superior Performance with Open Data

This new model, built with open data, answers medical questions and identifies diseases better than many other models, even much bigger ones.

OpenMedQ Model
Other Big Models
Compare Results
OpenMedQ Wins Often