Mixed
It seems to have been holding up pretty well until about 700k+
a_e_k on Hacker News
700k+
In the thread “1M context is now generally available for Opus 4.6 and Sonnet 4.6”, replying to this comment
Helped: Hands-on pair-programming mode rather than fully automated.
Got in the way: Performance degrades significantly past 700k tokens.
I've been using the 1M window at work through our enterprise plan as I'm beginning to adopt AI in my development workflow (via Cline). It seems to have been holding up pretty well until about 700k+. Sometimes it would continue to do okay past that, sometimes it started getting a bit dumb around there. …