Though literally "VedAnta" means "End of Veda", it should be interpreted as Beyond Veda. Because "end" is also a part of Vedas.
VedAnta is an umbrella term for various philosophies and is not limited to Upanishada-s. Hence, I will concentrate on "VedAnta" in general.
Bhagavad Gita is also considered as a "VedAnta", because it doesn't talk about worldly matters, like 'what or what not - to do'. Rather it discusses the final destination, which is beyond every worlds (loka-s).
Here is that verse, which supports why, "VedAnta = Beyond Veda":
BG 2.45 - Veda-s are subjected to only 3 modes of material nature (Sattva, Rajas, Tamas); O Arjuna, become free of these 3 modes, free of duality, ever situated in "constant-ness"; free of gaining support [and] self sustained.
The lord suggests Arjuna to be beyond traditional Veda-s viz. VedAnta. And attain the state of non-duality, viz. Advaita.
[Note: There is no mention in Gita, if Krishna referred Purva/Uttara MimAnsa of Vedas.]