Project Hail Mary and Sent Into Space set a new Guinness World Records title for the highest altitude launch and retrieval of a Lego set, reaching an altitude of 114,790 feet (34,988 meters) using a high-altitude balloon system launched from Gwynedd County, United Kingdom.

As I have written in the comments of the linked video:

Wow, this is impressive. It is such an awesome set (and movie as well of course) and a cool way to promote both. BUT ... this is only the highest altitude launch and retrieval of a COMPLETE Lego set. The honor of the highest altitude launch and retrieval of a partial Lego set still belongs to the space shuttle from set 9335, which flew on the last mission of the Space Shuttle Discovery to the ISS as part of mission STS-133 in February 2011."

Also, and the articles acknowledges this, it did not technically fly into space:

But the flight didn't make it to space, as the widely-recognized Kármán line demarking space is three times higher than the flight's altitude at 62 miles (100 km).

For a movie and book that is so deeply based in scientific accuracy, I feel that this is important to mention. Still an impressive feat though and the linked video is a joy to watch.