But peoples are not confident on the routers , giving automatic control , they are not confident will it save cost or just go in more loops and increase cost.
Any options someone can use locally, say with Claude Code?
It takes a little sweat, but you can wire Claude Code into n8n by running Claude through Docker, SSH, or local command execution from inside a workflow. That means n8n can route a request to Claude as one of its LLM backends. See: https://n8n.io/