I love Kimi for some things, but K3 to me struggles with things Opus 4.8 breezes through. Admittedly stuff that is on the more complex side (code generation bugs in a compiler) to the point that after two days of struggle I stopped Kimi and will have Opus redo its work once I have spare tokens...

This wasn't just being slow - it didn't make forward progress.

For simpler stuff even 2.7 does just fine, though.