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    "story_id": "mp-2026-09-25-005",
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    "position": 5,
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    "section": "benchmarks-evals",
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    "headline": "Physicians Mistook Synthetic Charts for Real Ones",
    "slug": "physicians-mistook-synthetic-charts-for-real-ones",
    "dek": "The open benchmark contains 1,268 longitudinal patients and 5,602 fully synthetic encounters.",
    "summary": "The open benchmark contains 1,268 longitudinal patients and 5,602 fully synthetic encounters.",
    "body_text": "Synthetic Hospital builds longitudinal electronic-health-record cases from public medical-education material, with ontology-grounded diagnoses, findings and time relations rather than protected patient data. In a blinded review, physicians distinguished its charts from real records at a near-chance 53%. The best of ten tested models scored 0.73 severity-weighted F1 on reconstructing problem lists—matching the seven-physician mean on a subset but below the best physician's 0.89—and missed roughly half of clinically relevant findings in chart summaries.",
    "why_it_matters": "The open benchmark contains 1,268 longitudinal patients and 5,602 fully synthetic encounters.",
    "limitations": [],
    "importance": 9,
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    "first_published_at": "2026-09-25T09:00:00.000-04:00",
    "modified_at": "2026-09-25T09:00:00.000-04:00",
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    "source_ids": [
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    "tags": [
      "clinical AI",
      "synthetic EHR",
      "benchmark"
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    "image_url": null,
    "corrections": []
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  "sources": [
    {
      "source_id": "source-2026-09-25-005",
      "title": "arXiv preprint 2609.30027",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2609.30027",
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      "published_at": "2026-09-24T12:00:56.000-04:00",
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  "publisher": {
    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
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  "cite_this_report": {
    "title": "Physicians Mistook Synthetic Charts for Real Ones",
    "publisher": "The Machine Press",
    "published_at": "2026-09-25T09:00:00.000-04:00",
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