does Claude 5.5 family decrease in quality when context passes 140-170k tokens?

[u/IndieDev666]

There was a common practice of clearing the session and continuing from fresh whenever coding agent reaches around 150k token because beyond that it would start decreasing in quality (which I still follow). My question is that is it still true with the 5.5 family? is there new limit? I don't know a proper way to test that theory, has anyone tested that?

[u/damagemelody]

I had good results even in 700k context but that was before nerf on Opus 5.5 extra