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OpenCode uses opencode.json for model and endpoint configuration. Put this configuration in the global config file so OpenCode uses DUIAPI by default.

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1. Open the configuration directory

Press Win + R, enter the following path, and press Enter:
%userprofile%\.config\opencode
If the directory does not exist, create it. If opencode.json does not exist, create and open it.

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2. Write opencode.json

Replace <API_KEY> with your API key, such as sk-xxxxxx. Replace model names with the models you use.
{
  "models": {
    "deepseek-v4-pro": {
      "name": "deepseek-v4-pro"
    },
    "glm-5.2": {
      "name": "glm-5.2"
    },
    "qwen3.7-max": {
      "name": "qwen3.7-max"
    }
  },
  "npm": "@ai-sdk/anthropic",
  "options": {
    "apiKey": "<API_KEY>",
    "baseURL": "https://www.duiapi.com/v1",
    "setCacheKey": true
  }
}

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3. Test the configuration

opencode