Is Ozymandias a villain or an antihero?

Really hard call.. I'd say villain..

Right now, he's more of a villain.

Lawful evil so villain

He’s a villain. But his end goal or motivation for trying to avoid catastrophic mass death by nuclear war does have a bit of nobleness to it...in a sick demented kind of way

I f Winston Churchill or any comparable real person is considered a hero i dont see how Ozy isn't a hero.

He's an anti-villain. A character with heroic goals, traits, and virtues who is ultimately the villain of the story.

Anti-Villain.

Good intentions. Evil acts.

Like others have said, he fits the archetype of the anti villain.

Anti-villain.

The Punisher and Wolverine are anti-heroes; they are darker in method but still do good overall

Genocide in the name of peace isn't heroic, but it is enough to make him an anti-villain.

Ozy is a typical villain with delusion of grandeur/messiah complex .

But atleast he is not as stupid as MCU Thanos.

Nope. Anti Villains do good things in the name of evil.

Instead of everyone dying only a select few die. The end justified the means

https://tvtropes.org/pmwiki/pmwiki.php/Main/AntiVillain

An Anti-Villain is the opposite of an Anti-Hero — a character with heroic goals, personality traits, and/or virtues who is ultimately the villain. Their desired ends are mostly good, but their means of getting there range from evil to undesirable. Alternatively, their goals may be selfish or have long-term consequences they don't care about, but they're good people who might even team up with the hero if their goals don't conflict.

Ozymandias fits the definition of the trope perfectly. In order to save billions ( their desired ends are mostly good ) they're willing to kill millions ( their means of getting there range from evil to undesirable ).

He's an Anti-Villain as others have said before me.

Anti-Villain