API ReferenceOpenClawAgentsTool CallingClaude Code

Claude Code & Anthropic SDK

Run Claude Code, Anthropic Python SDK, and other Anthropic-compatible tools directly against staik — Swedish GPU infrastructure with full data residency.

Quickstart

staik offers an Anthropic Messages API-compatible endpoint:

Endpoint
POST https://api.staik.se/v1/messages

Same auth as all other staik endpoints — send your API key via x-api-key header or Authorization: Bearer.

Claude Code

Point Claude Code at staik by setting two environment variables:

BashStart Claude Code with staik
# Set environment variables
export ANTHROPIC_BASE_URL=https://api.staik.se
export ANTHROPIC_API_KEY=sk-st-your-key

# Launch Claude Code
claude

Claude Code will now use staik's Swedish GPUs instead of Anthropic's cloud service. All tools work — file reading, searching, code editing, and more.

Tip

You can add the variables to your .bashrc, .zshrc, or .env file so they are set automatically every time you open a terminal.

# ~/.zshrc
export ANTHROPIC_BASE_URL=https://api.staik.se
export ANTHROPIC_API_KEY=sk-st-your-key

Important about token usage

Claude Code is token-intensive: each request sends the system prompt, tool definitions, CLAUDE.md files and the full conversation history — often 20,000–30,000 prompt tokens per call. The Early Adopter plan's 100,000 tokens/day limit therefore typically only lasts 3–4 requests.

For serious Claude Code usage we recommend the Early Agent plan (50,000 tokens/hour rolling window) or one of the Agent plans. Contact customercare@staik.se and we'll upgrade you.

Anthropic SDK

Use the Anthropic Python or TypeScript SDK directly with staik.

PythonAnthropic SDK
import anthropic

client = anthropic.Anthropic(
    base_url="https://api.staik.se",
    api_key="sk-st-your-key",
)

message = client.messages.create(
    model="qwen3.5:35b-a3b",
    max_tokens=1024,
    messages=[
        {"role": "user", "content": "Explain how a transformer works."}
    ],
)
print(message.content[0].text)
TypeScriptAnthropic SDK
import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic({
  baseURL: "https://api.staik.se",
  apiKey: "sk-st-your-key",
});

const message = await client.messages.create({
  model: "qwen3.5:35b-a3b",
  max_tokens: 1024,
  messages: [
    { role: "user", content: "Explain how a transformer works." }
  ],
});
console.log(message.content[0].text);
PythonStreaming
import anthropic

client = anthropic.Anthropic(
    base_url="https://api.staik.se",
    api_key="sk-st-your-key",
)

with client.messages.stream(
    model="qwen3.5:35b-a3b",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Write a haiku about Stockholm"}],
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)

Model Mapping

You can send either staik model names or Claude model names — both work. Claude names are automatically mapped:

Sent model nameMaps to
qwen3.5:35b-a3bqwen3.5:35b-a3b
qwen3.5:9bqwen3.5:9b
gemma4:31bgemma4:31b
claude-sonnet-4-6qwen3.5:35b-a3b
claude-opus-4-6qwen3.5:35b-a3b
claude-haiku-4-5-20251001qwen3.5:9b

Recommendation: use staik model names directly for clarity. Claude mapping exists primarily for seamless Claude Code integration.

Supported Features

Text responses

Full support for single and multi-turn conversations.

Streaming

Server-sent events in Anthropic format (message_start, content_block_delta, message_stop).

Tool calling

Tools are automatically translated between Anthropic (tool_use/tool_result) and OpenAI format.

System prompt

Support for system as string or list of content blocks.

Auth & rate limiting

Same token limits, queues, and circuit breaker as the OpenAI endpoint.

Model selection

Choose staik model via the model field — all models available.

Limitations

The following Anthropic-specific features are not supported because the backend models (Qwen, Gemma) do not have these capabilities:

  • !Extended thinking — the thinking parameter is ignored. The model thinks inline instead.
  • !Images in messages — Anthropic format for images (base64 image content blocks) is not yet supported via this endpoint. Use the OpenAI endpoint for vision.
  • !PDF / document — Anthropic's document content block type is not supported.
  • !Prompt caching — the cache_control field is ignored. All requests are fully processed.

Ready to start?

All plans have access to the Anthropic endpoint. Use your existing staik API key.

Get API keyAPI Reference