That tends to work quite poorly because Claude Code does not use standard completions APIs. I tried it with Kimi, using litellm[proxy], and it failed in too many places.

You can try Kimi's Anthropic-compatible API.

Just connect Claude Code to Kimi's API endpoint and everything works well

https://www.kimi.com/code/docs/en/more/third-party-agents.ht...

It worked very well for me using qwen3 coder behind a litellm. Most other models just fail in weird ways though.

opencode is a good alternative that doesnt flake out in this way.

If you don't use Antrophic models there's no reason to use Claude Code at all. Opencode gives so much more choice.