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Claude Code is a terminal coding agent. It uses the native Anthropic Messages configuration, so its NexusAPI Base URL is https://nexusapi.link — do not append /v1.

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1. Install Claude Code

Use an official installer. A native installation does not require Node.js.

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macOS, Linux, or WSL

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Windows PowerShell

You may also use WinGet on Windows or Homebrew on macOS:
Verify the installed client before editing configuration:

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2. Create a NexusAPI key

In the NexusAPI console, open Token Management → Add token. Give the key a recognizable name, choose a Claude-compatible group that contains the model you need, and set an appropriate limit. Do not assume every Claude-branded model is available to every group; verify it in the Model Marketplace or with /v1/models.

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3. Set user-level configuration

Claude Code reads user settings from: Create it on macOS, Linux, WSL, or Git Bash:
On Windows PowerShell:
Merge the following env values into an existing file; do not overwrite your MCP, permissions, or other settings.
Keep this in your user directory, not in a project repository. Never commit or screenshot a real key.
Only disable experimental fields when the error asks for itIf an error explicitly mentions unsupported context_management or experimental inputs, add CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS=1 to env and test again. It disables some preview fields and is not a default setting for every user.

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4. Start and verify

Open a new terminal, enter a project directory, and run:
Run /status inside Claude Code. Confirm that Anthropic base URL is https://nexusapi.link and authentication comes from ANTHROPIC_AUTH_TOKEN, then send a short text message.

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Troubleshooting

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Invalid API Key · Please run /login

Confirm that both environment values are saved, the key itself is enabled, and the terminal was restarted. Do not solve this by editing Claude’s internal login state files.

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Unable to connect to Anthropic services

Run claude doctor, check the JSON syntax in settings.json, then reopen the terminal. If it persists, save the original error, claude --version, and claude doctor output.

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fetch failed

First distinguish a model call from Claude Code’s WebFetch feature.
  1. Send a one-line normal prompt. If it succeeds, NexusAPI model calls are working; troubleshoot WebFetch under its own network and safety rules.
  2. If all model calls fail, run claude doctor and use /status to confirm the Base URL is still https://nexusapi.link.
  3. Check local DNS, firewall, corporate network, or an existing trusted proxy for access to nexusapi.link.
  4. Open a fresh terminal and test once. For persistent failures, retain the version, doctor output, full error, and Request ID, then use the self-check guide.

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The status says offline

Some auxiliary features check official or third-party services separately. Verify the actual gateway URL with /status and send a small text request before treating offline as an API outage.

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Official references