Walmart Inc is adding Cruise, a majority-owned affiliate of US automaker General Motors Co , to its roster of self-driving startup partners, in a pilot delivery program early next year in Scottsdale, Arizona, the retailer said on Tuesday.

Walmart previously has partnered with tech startups Flytrex, Nuro and Gatik on pilot delivery programs with self-driving vehicles in several US locations, and with Ford Motor Co in a Miami delivery pilot.

Cruise has been testing its self-driving vehicles for several years in San Francisco, as well as Phoenix. In addition to robotaxis, it has provided automated grocery delivery services to residents in San Francisco.

Backed by Honda Motor Co, SoftBank Group and T. Rowe Price, Cruise told Reuters in an email it is "laser-focused on making this first pilot successful with Walmart."

Cruise did not say how many vehicles will be deployed in the Walmart pilot.

Walmart announced the latest partnership in a blog post early Tuesday.