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    "story_id": "mp-2026-10-10-006",
    "source_story_id": "tmp-story-metr-time-horizon-validity",
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    "section": "benchmarks-evals",
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    "headline": "A Tenfold Time-Horizon Jump Was Not Always the Same Leap",
    "slug": "a-tenfold-time-horizon-jump-was-not-always-the-same-leap",
    "dek": "A statistical reanalysis finds that human task time maps unevenly onto AI difficulty, especially between two and thirty minutes.",
    "summary": "A statistical reanalysis finds that human task time maps unevenly onto AI difficulty, especially between two and thirty minutes.",
    "body_text": "METR’s time horizon expresses capability as the human completion time of tasks an AI solves with 50% probability. Reanalyzing 228 tasks and 26 systems with splines and item-response theory, the authors find that the mapping from human time to AI difficulty is nearly flat from roughly two to thirty minutes and closer to linear elsewhere. That makes a jump from three to thirty minutes statistically easier than one from thirty minutes to five hours, despite the same multiplier. Cross-validated scoring favored the new estimates. The paper does not invalidate time horizons; it argues that point estimates should travel with diagnostic plots and construct-validity checks.",
    "why_it_matters": "A statistical reanalysis finds that human task time maps unevenly onto AI difficulty, especially between two and thirty minutes.",
    "limitations": [
      "The paper does not invalidate time horizons; it argues that point estimates should travel with diagnostic plots and construct-validity checks."
    ],
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    "first_published_at": "2026-10-10T09:00:00.000-04:00",
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        "qualification": "The paper does not invalidate time horizons; it argues that point estimates should travel with diagnostic plots and construct-validity checks."
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    "source_ids": [
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    "tags": [
      "AI time horizons",
      "benchmark validity",
      "statistics"
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  "sources": [
    {
      "source_id": "source-2026-10-10-006",
      "title": "arXiv preprint 2610.12466, original v1",
      "publisher": "arXiv / submitting research authors",
      "url": "https://arxiv.org/abs/2610.12466v1",
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      "published_at": "2026-10-08T13:59:50.000-04:00",
      "accessed_at": "2026-10-10T08:22:13.309-04:00",
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    "name": "The Machine Press",
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    "description": "A daily newspaper for the age of artificial intelligence."
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  "cite_this_report": {
    "title": "A Tenfold Time-Horizon Jump Was Not Always the Same Leap",
    "publisher": "The Machine Press",
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