The latest frontier models will write code better than you and more elegant, with less lines of code, in 100th of the time, with full test coverage. Hand coding is like writing out assembly/machine code rather than using a compiler.
Maybe you have access to some other model?
Insisting on writing code by hand when LLMs are available is not software engineering in 2026. Engineers find the most cost-effective solution for the problem at hand that meets the requirements.
They often do, but they often don’t. I regularly have to push for more elegant, or less lazy solutions.