If you're building an optimizing compiler, a CUDA kernel, a database, a high performance concurrent data structure with tricky locking, etc. etc. it's still not really close. Sol 5.6 on high just slays e.g. GLM 5.2 for this kind of work for me.
I'm sure K3 is fine for these things too, but I can't afford it at its API rates compared to a Codex coding plan.
For now.
https://github.com/rdaum/mica/tree/main/crates/relation-kern...
https://github.com/rdaum/mica/tree/main/crates/vm
https://github.com/rdaum/pagebox/blob/main/crates/wal/src/wa...
I have CUDA work here somewhere too but I have the repository private right now