Its shares, which have fallen about 15% so far this year, rose nearly 2% in extended trading.
The results suggest that the electric-vehicle maker's long-awaited push into the mass market has picked up pace. It began customer deliveries of the Tesla (TSLA.O) Model Y rival during the second quarter and improved its outlook for deliveries a softer U.S. EV market.
Rivian said it hosted a record number of R2 demo drives during the quarter, reflecting strong customer interest in the vehicle.
"We've been very positively encouraged by the conversion rate of reservations to orders for the Launch Edition. It is meaningfully above our own internal projections," CEO RJ Scaringe told Reuters.
The company will start to see positive gross margin on the R2 vehicle in the back half of the year, he said.
Rivian's expansion into the lower-priced segment comes as U.S. EV demand has slowed following the expiry of a federal consumer tax credit in September last year.
Revenue rose 27% to $1.66 billion, topping analysts' average estimate of about $1.51 billion, according to data compiled by LSEG.
Adjusted loss per share came in at 46 cents, compared with the estimate of a 63-cent loss.
Rivian raised full-year delivery forecast to 65,000-70,000 vehicles from 62,000-67,000. It lowered planned capital spending projection to between $1.7 billion and $1.8 billion, from $1.95 billion to $2.05 billion earlier, and expects a smaller adjusted core loss.
Software and services revenue climbed 37% to $515 million, with $308 million coming from Rivian's joint venture with Volkswagen (VOWG.DE).
Rivian this month raised $1.5 billion through a share sale to help fund equity contributions tied to a U.S. Department of Energy loan supporting construction of its Georgia factory.
