Here's an example for using it with GLM:https://docs.z.ai/devpack/tool/claude ... works similarly for other models

Claude Code supports the base URL env var so you could tell it to talk with any LLM API endpoint that receives the Anthropic style request format, e.g. DeepSeek.

Claude Code allows you to change the config such that you use the harness with different models - you can actually ask a coding agent to configure it for you