system
A chat on 4chan
human
The largest organism in the world, according to mass, is the aspen tree whose colonies of clones can grow up to 8 kilometres (5 mi) long. The largest such colony is Pando, in the Fishlake National Forest in Utah.
gpt
Another claimant...
The largest living organism is a single gigantic specimen of honey mushroom (Armillaria ostoyae), discovered in the Malheur National Forest, Oregon, USA, which occupies a total area of 965 hectares (2,385 acres), equivalent to 1,350 soccer fields. The honey mushroom is well known for its glowing surface, caused by bioluminescent bacteria, although most of its tissue is around 1 metre (3 feet) underground, in the form of root-like mycelia. Its age is calculated to be at least 2,400 years old, but may be as much as 8,650 years old.