US open weights are much worse, way more than 12 months apart compared to frontier.

> Why does that seem unlikely? The difference between frontier and open weights has been much less than 12 months for a while now.

Frontier and open weights? Yes.

Frontier and _US_ open weights? No.

I'd expect a US open weights provider to suddenly get bought or go non-open if they get near Opus 5.5 anyway.