Write the following content into the Claude Code configuration file. Replace <your SU8 API Key> with your own key. The default model is gpt-5.5, but you can also use a model name copied from Models and channels.

{
  "CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC": "1",
  "DISABLE_ERROR_REPORTING": "1",
  "DISABLE_TELEMETRY": "1",
  "env": {
    "ANTHROPIC_AUTH_TOKEN": "<your SU8 API Key>",
    "ANTHROPIC_BASE_URL": "https://www.su8.codes",
    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "gpt-5.5",
    "ANTHROPIC_DEFAULT_OPUS_MODEL": "gpt-5.5",
    "ANTHROPIC_DEFAULT_SONNET_MODEL": "gpt-5.5",
    "ANTHROPIC_MODEL": "gpt-5.5",
    "CLAUDE_BASH_NO_LOGIN": "1"
  },
  "includeCoAuthoredBy": false,
  "model": "gpt-5.5",
  "attribution": {
    "commit": "",
    "pr": ""
  }
}

After configuration, fully restart Claude Code, then run a simple request to verify it.