Black Order vs Thanos
Rules.
Fight is in New York city (no people around).
Thanos can die (no death curse here).
Fight is to the death or ko.
Proxima is prone to use her spear (sun mass and poison) in this fight. Thanos can't mentally control the spear like she can. He can grab it though.
All characters are fighting with optimal intelligence (they don't do things that are contrary to their actual intelligence).
First fight
Thanos does not have his tech and is reduced to only blasting and h2h.
Second fight
Thanos has access to any tech that's normally and currently on his person (no outside tech) and can perform other actions within his current powers.