What is METR?

METR is an organization that tracks AI task length doubling time. As of Apr 2026, Nathan Labenz noted that METR’s estimated doubling time for task length was under four months, implying a greater than 8x increase over a year, possibly 10-12x. In May 2026, Ben Todd said METR has 20 useful projects they would like to do but only capacity for two or three.