Then they needed a flash model so they picked the lightest element.
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.
And "Hydrogen surpasses Argon on the Artificial Analysis Intelligence Index at its default high thinking level"
Given it's twice the price of 3.8 Flash I hope they would find room for another cheaper tier, but the Hydrogen name suggests not.
I'm glad Google are coming out with some decent models but it's a slightly confusing line up.
A = argon for initial release B was skipped because you can't name a product boron C = carbon D = ??????
They might be going for atomic weight, but the average person couldn't say whether argon or carbon was heavier.