I reported a similar case of mine several days ago [0]. I was able to achieve better quality than Claude Code's 624 lines of spaghetti code in 334 lines of well-designed code. In a previous case, I rewrote ~400-line LLM generated code in 130 lines.
> we now think it's +9% - +38%
If you are referring to the following quote [0], you are off by a sign:
> we now estimate a speedup of -18% with a confidence interval between -38% and +9%.