How to build a coding agent

what's the best current cli (with a non interactive option) that is on par with Claude code but can work with other llms like ollama, openrouter etc? I tried stuff like aider but it cannot discover files, the open source gemini one but it was terrible; what is a good one that maybe is the same as CC if you plug in Opus?

Haven’t tried many but the LLM cli seems alright to me

Opencode is pretty good and likely meets your needs. One thing I'll call out is Gemini is terrible as an agent currently because Gemini is not a very good tool calling LLM. It's an oracle. https://ghuntley.com/cars/