Anthropic-compatible access - APIONE AI

The Anthropic SDK Base URL does not include /v1. The SDK adds /v1/messages.

HTTP example

curl --fail-with-body --max-time 120 https://api.apione.ai/v1/messages \
  -H "x-api-key: $APIONE_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  --data "{\"model\":\"$APIONE_MODEL\",\"max_tokens\":512,\"messages\":[{\"role\":\"user\",\"content\":\"Hello\"}]}"

Set the environment variable as shown in the quickstart. Select a model available to your key.

Python example

python -m pip install anthropic

import os
import anthropic

client = anthropic.Anthropic(
    base_url="https://api.apione.ai",
    api_key=os.environ["APIONE_API_KEY"],
)
message = client.messages.create(
    model=os.environ["APIONE_MODEL"],
    max_tokens=512,
    messages=[{"role": "user", "content": "Explain API compatibility."}],
)
for block in message.content:
    if block.type == "text":
        print(block.text)

Differences from OpenAI Chat

Put the system prompt in the top-level system field rather than a system message inside messages.
max_tokens is required.
Read text blocks from content[], not choices.
Streaming uses named events and requires protocol-specific parsing.

Compatibility does not imply every extension field can be translated. Reduce unsupported requests to a minimal example. See APIONE’s protocol documentation.