It is hard to say how similar different companies are when deciding what counts as a disengagement that needs reporting, but if the headline numbers are accurate, having twice as many disengagements per mile is extremely impressive; the SF environment is far more than twice as hard to drive in as suburban / highway environments.

Also, Cruise’s disengagement rates are already ahead of what Waymo averaged in 2018: https://miro.medium.com/max/1644/0*lYhqv0Bd82ocQP5T

Waymo disengagement rates were halved in 2018 though so they might be continuing to exhibit substantial improvements as well.