The first abort test using the special test vehicle (TV) as part of Gaganyaan will see the crew module separate from the TV at a height of around 11km (from sea level), attain an altitude of around 15km before falling back to back in the Bay of Bengal.

from Times of India https://timesofindia.indiatimes.com/home/science/gaganyaan-abort-test-vehicle-to-go-up-to-11km-crew-module-around-15km/articleshow/93007458.cms