Set up in under a minute.

One command. It asks for your key, writes the config and installs the CLI if it is missing. Requires Node.js.

Add --only cli or --only desktop to configure one surface, or --yes to skip every prompt.

Idempotent. Re-run any time to update your key or reconfigure — it merges into your existing config rather than overwriting it, and takes a backup first either way.

If you would rather write the file yourself. Two steps.

{
  "env": {
    "ANTHROPIC_AUTH_TOKEN": "sk-cp-your-api-key",
    "ANTHROPIC_BASE_URL": "https://api.codemax.pro",
    "ANTHROPIC_MODEL": "claude-opus-5",
    "ANTHROPIC_SMALL_FAST_MODEL": "claude-haiku-4-5-20251001",
    "ANTHROPIC_DEFAULT_SONNET_MODEL": "claude-sonnet-5",
    "ANTHROPIC_DEFAULT_OPUS_MODEL": "claude-opus-5",
    "ANTHROPIC_DEFAULT_HAIKU_MODEL": "claude-haiku-4-5-20251001",
    "CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC": "1"
  }
}

Web search and image understanding are included with every key. Point the client at https://api.codemax.pro and both work — no additional configuration.

The official Anthropic terminal client. Recommended.

The official extension reads the same configuration file as the CLI, so if you have already run the setup command there is nothing further to set.

One file, both surfaces — the CLI and the extension read the same settings, so changing your key once is enough for either.

The desktop app supports third-party inference: you point it at a gateway and it uses that instead of Anthropic. It keeps its own configuration — the settings file the CLI and the VS Code extension share does not apply here, so this is a separate step even if you have already set up Claude Code.

Both extensions speak the Anthropic API, so both take the same two values.

Cursor reaches codemax through its OpenAI base URL override.

claude-opus-5

You can add several models and switch between them: claude-opus-5, claude-sonnet-5.

Cascade takes the same override, under its own setting names.

You can also run the Claude Code CLI setup in Windsurf's integrated terminal.

Open-source Claude Code alternative. One command configures it.

The script registers Codemax as a custom provider with all Claude models. Use /model inside OpenClaw to switch between Opus, Sonnet and Haiku.

Terminal coding agent. Same shape: install, run our setup, go.

The script registers Codemax as the Anthropic provider in OpenCode. Use /models to switch between Opus, Sonnet and Haiku.

Anything that speaks the OpenAI API format takes these four values.

Works with Continue, Aider, Open Interpreter, LiteLLM, LibreChat, OpenClaw, and any other OpenAI-compatible tool.

Every tier is on the same key. Drop the literal id straight into the model field.

Older Claude model names resolve to the nearest tier, so an existing integration keeps working without an edit.

For direct integration, without a client in the way. It is the Anthropic Messages API — anything already written against that works unchanged.

Either header works, so an SDK written for either convention needs no adapter. Send one, not both.

Swap in your key and paste it into a terminal. A reply means the base URL, the key and the model id are all correct — the whole of setup, checked in one line.

curl https://api.codemax.pro/v1/messages \
  -H "x-api-key: sk-cp-your-api-key" \
  -H "anthropic-version: 2023-06-01" \
  -H "content-type: application/json" \
  -d '{
    "model": "claude-opus-5",
    "max_tokens": 256,
    "messages": [
      { "role": "user", "content": "Say hello in five words." }
    ]
  }'

what comes back

{
  "id": "msg_01Xa7bK...",
  "type": "message",
  "role": "assistant",
  "model": "claude-opus-5",
  "content": [
    { "type": "text", "text": "Hello there, good to meet you." }
  ],
  "stop_reason": "end_turn",
  "stop_sequence": null,
  "usage": { "input_tokens": 14, "output_tokens": 9 }
}

Shape, not a transcript — the text and the counts are whatever your own call returns. Add "stream": true to the body for server-sent events instead, in the same format your client already parses.