Rivian Automotive (NASDAQ:RIVN) has agreed to a $1.25 billion deal with Uber for up to 50,000 R2-based robotaxis as part of the deal, with an initial investment of $300 million and an option for Uber to purchase up to 40,000 additional robotaxis. However, some analysts believe this deal is a high-stakes test for Rivian, as Rivian must meet four performance milestones to secure the funding. The deal shows Uber's confidence in Rivian's autonomy capabilities, while Rivian is investing "all-in" for the deal.