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    "story_id": "mp-2026-09-30-010",
    "source_story_id": "tmp-story-grounded-entity-biographies",
    "edition_id": "mp-2026-09-30-morning-0083",
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    "position": 10,
    "story_type": "dispatch",
    "section": "frontier-models",
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    "headline": "Long-Video Memory Followed Objects Across Days",
    "slug": "long-video-memory-followed-objects-across-days",
    "dek": "Grounded Entity Biographies linked the same physical instance across clips without discarding each moment's context.",
    "summary": "Grounded Entity Biographies linked the same physical instance across clips without discarding each moment's context.",
    "body_text": "Grounded Entity Biographies groups visually grounded observations of one physical object into a retrievable history, then supplies that biography alongside episodic evidence when answering questions. Across four benchmarks containing day- and week-long recordings, the authors report improvements for both multiple-choice and open-ended answers. On EgoLifeQA, accuracy reached 72.0%, 4.4 percentage points above the best published result cited in the paper. Ablations attribute gains to both identity association and biography reading; extra descriptions alone did not recover the full improvement.",
    "why_it_matters": "Grounded Entity Biographies linked the same physical instance across clips without discarding each moment's context.",
    "limitations": [
      "Ablations attribute gains to both identity association and biography reading; extra descriptions alone did not recover the full improvement."
    ],
    "importance": 8,
    "canonical_url": "https://themachinepress.com/story/mp-2026-09-30-010/long-video-memory-followed-objects-across-days",
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    "first_published_at": "2026-09-30T09:00:00.000-04:00",
    "modified_at": "2026-09-30T09:02:00.000-04:00",
    "content_status": "new",
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        "text": "Grounded Entity Biographies linked the same physical instance across clips without discarding each moment's context.",
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        "qualification": "Ablations attribute gains to both identity association and biography reading; extra descriptions alone did not recover the full improvement."
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    "source_ids": [
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    "tags": [
      "long video",
      "multimodal memory",
      "object identity"
    ],
    "image_url": null,
    "corrections": []
  },
  "sources": [
    {
      "source_id": "source-2026-09-30-010",
      "title": "arXiv preprint 2609.38155",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2609.38155",
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      "source_type": "primary_research",
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      "published_at": "2026-09-29T13:59:01.000-04:00",
      "accessed_at": "2026-09-30T08:24:00.000-04:00",
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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": "Long-Video Memory Followed Objects Across Days",
    "publisher": "The Machine Press",
    "published_at": "2026-09-30T09:00:00.000-04:00",
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