It's not, Gemini 4 Carbon is better than Gemini 4 Argon.
Argon internally was called Barium (Argon was a different model) so the models were originally named in alphabetical order. Then they change their mind and decided to call the lightweight model following the atomic weight so Hydrogen after they have released (A)rgon and (C)arbon. I imagine that this lightweight model is the original Argon.
alt Hacker News
It's not, Gemini 4 Carbon is better than Gemini 4 Argon.
Argon internally was called Barium (Argon was a different model) so the models were originally named in alphabetical order. Then they change their mind and decided to call the lightweight model following the atomic weight so Hydrogen after they have released (A)rgon and (C)arbon. I imagine that this lightweight model is the original Argon.