Claude Code

Claude Code can use a custom API endpoint.

Full walkthrough (Windows / macOS, settings.json): CLI setup → Claude Code.

Environment variables

export ANTHROPIC_BASE_URL="https://apimaster.ai"
export ANTHROPIC_API_KEY="YOUR_APMASTER_API_KEY"

Start claude in that shell and pick a model, e.g.:

/model claude-sonnet-4-6

Variable names follow the Claude Code version you run (ANTHROPIC_AUTH_TOKEN vs ANTHROPIC_API_KEY — use one).

Troubleshooting

Issue	What to try
401	Key from APIMaster console, not expired
Model missing	Check supported models
Truncated output	Raise max_tokens for thinking models
SSL errors	Use https:// and the correct host

You can also route via the OpenAI-compatible path if your plugin expects Chat Completions.