Claude Code can read projects, modify files, and run commands. Follow the official installation instructions. The npm installation method is: 
npm install -g @anthropic-ai/claude-code

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Configure and start

PowerShell: 
$env:ANTHROPIC_BASE_URL = "https://infistar.ai"
$env:ANTHROPIC_AUTH_TOKEN = "YOUR_API_KEY"
claude
macOS or Linux: 
export ANTHROPIC_BASE_URL="https://infistar.ai"
export ANTHROPIC_AUTH_TOKEN="YOUR_API_KEY"
claude
Do not append /v1; Claude Code adds the request path.

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Verify

Use /status to inspect the connection configuration. Then ask: 
Reply only with "Configuration successful". Do not read or modify files, and do not run commands.
Ensure the selected model is available to your key and supports the Messages API.

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Save settings

After verifying the connection, you may store the configuration in %USERPROFILE%\.claude\settings.json or ~/.claude/settings.json: 
{
  "env": {
    "ANTHROPIC_BASE_URL": "https://infistar.ai",
    "ANTHROPIC_AUTH_TOKEN": "YOUR_API_KEY"
  }
}
This file contains a key. Do not share it or commit it to Git. For 404, remove an extra /v1. For 401, check the key and ANTHROPIC_AUTH_TOKEN. If the client still requests a login, launch it from the terminal containing these variables and inspect /status again. For model errors, confirm the exact model’s availability to your key. See the official gateway documentation for client-side configuration details.