[refulgentis]

If Claude 3.5 was a base model*, 3.7 is a third iteration** of that model.

GPT-4.5 is a 1.0, or, the first iteration of that model.

* My thought process when writing: "When evaluating this, I should assume the least charitable position for GPT-4.5 having headroom. I should assume Claude 3.5 was a completely new model scale, and it was the same scale as GPT-4.5." (this is rather unlikely, can explain why I think that if you're interested)

** 3.5 is an iteration, 3.6 is an iteration, 3.7 is an iteration.