In 1984, does Winston eventually lose his humanity, leaving the Party and Big Brother in complete control?

No,has not
completely lost
his humanity at the end of . The Party
and Big Brother
are not in complete control. The Party believes they have taken his entire

humanity after Winston betrays , which is why they release him, but they are wrong. They
are not
as all powerful aswould have Winston believeor as O'Brien himself
arrogantly believes.

The evidence comes at the very end of
the novel. Winston is an undoubtedly shattered,
hollowed out man, with no
desire left to challenge the Party's version of events. He has learned
it is
better to conform than to fight, and he no longer has much will left to
live.

While sitting in the Chestnut Cafe, however,
watching the telescreen and drinking
Victory gin, a memory of his childhood
comes unbidden to Winston. He recalls a day when his
mother bought he and his
sister a cheap cardboard version of a game called Snakes and Ladders.
He and
his mother played it while his baby sister watched. As Winston
remembers:

For a whole
afternoon...