How long do Xiaomi phones get updates?

Xiaomi's windows step down by tier. Its flagships (Xiaomi 14 and 15 series) and the 14T/15-class T-series get four Android/HyperOS upgrades plus five years of security patches; recent Redmi Note Pro and Pro+ models get roughly three upgrades and four years; and POCO devices typically get two-to-three upgrades and four years. Note that most Xiaomi, Redmi and POCO phones are not sold through official US channels, so US buyers import them.

Source: Xiaomi's policy documentation