I think 3.5 Flash is supposed to improve the long-range instruction following.

I haven't tried it at that because for the short range tasks I gave it I found it around Sonnet level, but slower (because it takes more tries!) which makes it more expensive.

The old Flash models were great because they were fast.

3.5 Flash shows Google can work around the old "Good, Fast or Cheap: Pick any two" thing by picking none of them.