Checked fact 42808 Nov 2026Research

The METR paper reports that the 80% time horizons are 4 to 6 times shorter than the 50% horizons (section 3.2.1).

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However, models’ 80% time horizons are 4-6x shorter, suggesting that even models that sometimes succeed on difficult and diverse tasks cannot reliably perform tasks of moderate length.

What the source said when we opened it, on 8 Nov 2026.

The source

Measuring AI Ability to Complete Long Tasks (arXiv 2503.14499v3)
METR

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Checked by the notis newsroom on 8 Nov 2026, against the source above.

In the story

How METR's time horizon rates AI agents by human task length 8 Nov 2026

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“The METR paper reports that the 80% time horizons are 4 to 6 times shorter than the 50% horizons (section 3.2.1).” ai notis, checked 8 Nov 2026. Source: Measuring AI Ability to Complete Long Tasks (arXiv 2503.14499v3) (METR). https://ainotis.com/c/4280

As a reference (APA style)

ai notis. (2026, November 8). The METR paper reports that the 80% time horizons are 4 to 6 times shorter than the 50% horizons (section 3.2.1) [Checked claim 4280]. ai notis. https://ainotis.com/c/4280

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