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Overview

LemonData supports the native Anthropic Messages API path, so you can use the official Anthropic SDK directly for Claude models.
For the Anthropic SDK, use https://api.lemondata.cc as the base URL, without appending /v1 yourself.

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Installation

pip install anthropic

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Configure the Client

from anthropic import Anthropic

client = Anthropic(
    api_key="sk-your-lemondata-key",
    base_url="https://api.lemondata.cc",
)

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Basic Usage

message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    messages=[
        {"role": "user", "content": "Explain LemonData in one sentence."}
    ]
)

print(message.content[0].text)

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Streaming

with client.messages.stream(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    messages=[{"role": "user", "content": "Write a short poem about coding."}]
) as stream:
    for text in stream.text_stream:
        print(text, end="", flush=True)

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Vision

import base64

message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    messages=[{
        "role": "user",
        "content": [
            {"type": "text", "text": "What's in this image?"},
            {
                "type": "image",
                "source": {
                    "type": "url",
                    "url": "https://example.com/image.jpg"
                }
            }
        ]
    }]
)

with open("image.png", "rb") as f:
    image_data = base64.b64encode(f.read()).decode()

message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    messages=[{
        "role": "user",
        "content": [
            {"type": "text", "text": "Describe this image"},
            {
                "type": "image",
                "source": {
                    "type": "base64",
                    "media_type": "image/png",
                    "data": image_data
                }
            }
        ]
    }]
)

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Tool Use

message = client.messages.create(
    model="claude-sonnet-4-6",
    max_tokens=1024,
    tools=[{
        "name": "get_weather",
        "description": "Get the weather for a location",
        "input_schema": {
            "type": "object",
            "properties": {
                "location": {"type": "string"}
            },
            "required": ["location"]
        }
    }],
    messages=[{"role": "user", "content": "What's the weather in Tokyo?"}]
)

for block in message.content:
    if block.type == "tool_use":
        print(block.name)
        print(block.input)

​
Extended Thinking

message = client.messages.create(
    model="claude-opus-4-6",
    max_tokens=16000,
    thinking={
        "type": "enabled",
        "budget_tokens": 10000
    },
    messages=[{"role": "user", "content": "Solve this complex problem step by step."}]
)

for block in message.content:
    if block.type == "thinking":
        print(block.thinking)
    elif block.type == "text":
        print(block.text)
ModelBest For
claude-opus-4-6Deep reasoning, long-form analysis
claude-sonnet-4-6Coding, general assistant tasks
claude-haiku-4-5Fast, lightweight responses

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Troubleshooting

  • Use https://api.lemondata.cc
  • Do not manually append /v1 when configuring the Anthropic SDK
  • Check that your LemonData API key starts with sk-
  • Confirm the key is active in LemonData dashboard
  • Let the Anthropic SDK manage the auth header instead of adding custom headers manually
  • Verify the Claude model name exactly
  • Check current availability in the LemonData model catalog