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Overview of the MEDIQA-EVAL 2026 Shared Task on Evaluation Metrics in Medical Multimodal Question Answering

Evaluating clinical text generation remains challenging, as automatic metrics often correlate weakly with clinician judgments. This issue is particularly pronounced in medical multimodal question answering (MMQA), where systems must integrate visual and textual information and evaluation must capture factual accuracy, visual grounding, completeness, and overall coherence. Despite rapid progress in MMQA, there is limited consensus on clinically meaningful evaluation, and existing metrics, largely adapted from general NLG or VQA, often fail to capture domain-specific criteria. We introduce MEDIQA-EVAL 2026, a shared task on evaluation metrics for medical multimodal QA. To our knowledge, this is the first shared task focused on evaluating automatic metrics in this setting. We release a dataset of medical visual question-answer pairs annotated with multidimensional clinician judgments. Systems are evaluated by the correlation of their metric scores with expert ratings on a held-out test set. Participants explored diverse approaches, including vision-language models, retrieval-augmented judging, metric-specific classifiers, reinforcement learning, and LLM-as-a-judge frameworks. Results show that model-based evaluators achieve stronger alignment with human judgments than traditional NLG metrics, particularly on English data, while performance remains lower on Chinese, highlighting challenges in multilingual evaluation. Notably, our MEDIQA LLM-as-a-judge approach achieves strong performance across both languages.