Actual projects where you'd want some LLM help start with millions of lines of code, not thousands.

With 1k lines of code you don't need an LLM, the entire source code can fit in one intern's head.

Have you tried Claude Code yet?

Even with it's 200,000 token limit it's still really impressive at diving through large codebases using find and grep.

The OP mentioned having LLM issues with 1k LOC, so I suppose he would have problems with millions. :D