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Manual configuration is useful when you want to edit Claude Code’s configuration file directly. After configuration, Claude Code sends model requests through DUIAPI.

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1. Open the configuration directory

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

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2. Write settings.json

Replace <API_KEY> with your API key, such as sk-xxxxxx. Replace <MODEL> with the model you use, such as qwen3.7-max.
Write the following content to settings.json:
{
  "env": {
    "ANTHROPIC_AUTH_TOKEN": "<API_KEY>",
    "ANTHROPIC_BASE_URL": "https://www.duiapi.com",
    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "<MODEL>",
    "ANTHROPIC_DEFAULT_OPUS_MODEL": "<MODEL>",
    "ANTHROPIC_DEFAULT_SONNET_MODEL": "<MODEL>",
    "ANTHROPIC_MODEL": "<MODEL>",
    "CLAUDE_CODE_SUBAGENT_MODEL": "<MODEL>"
  },
  "includeCoAuthoredBy": false
}

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3. Test the configuration

Save settings.json, then run:
claude
Send a test message after the chat UI opens. If Claude Code replies, the configuration works.