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Quick start

Python
from anthropic import Anthropic

client = Anthropic(
    base_url="https://api.orcarouter.ai",
    api_key="sk-orca-...",
)

response = client.messages.create(
    model="anthropic/claude-sonnet-4.6",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Hello"}],
)
print(response.content[0].text)
The Anthropic SDK appends /v1/messages to your base_url itself, so the bare host (without /v1) is the right form. Requests land on https://api.orcarouter.ai/v1/messages — OrcaRouter’s first-class Anthropic surface. Native SSE events (message_start, content_block_delta, message_stop, …) come through directly, and streaming, tool use, prompt caching (cache_control), and vision all work end-to-end. The SDK uses the standard x-api-key header to send api_key — OrcaRouter’s auth middleware recognizes that form on Anthropic-shape paths, so no header munging is required. See Get an API key for the full table of accepted auth headers.

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See also