Overview
LemonData supports the native Anthropic Messages API format. Use the official Anthropic SDK with LemonData to access Claude models.
Installation
Configuration
from anthropic import Anthropic
client = Anthropic(
api_key="sk-your-lemondata-key",
base_url="https://api.lemondata.cc"
)
Note: The base URL is https://api.lemondata.cc (without /v1) for the Anthropic SDK.
Basic Usage
message = client.messages.create(
model="claude-3-5-sonnet-20241022",
max_tokens=1024,
messages=[
{"role": "user", "content": "Hello, Claude!"}
]
)
print(message.content[0].text)
With System Prompt
message = client.messages.create(
model="claude-3-5-sonnet-20241022",
max_tokens=1024,
system="You are a helpful coding assistant.",
messages=[
{"role": "user", "content": "Write a Python function to reverse a string"}
]
)
Streaming
with client.messages.stream(
model="claude-3-5-sonnet-20241022",
max_tokens=1024,
messages=[{"role": "user", "content": "Tell me a story"}]
) as stream:
for text in stream.text_stream:
print(text, end="", flush=True)
Vision
import base64
# From URL
message = client.messages.create(
model="claude-3-5-sonnet-20241022",
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"
}
}
]
}]
)
# From base64
with open("image.png", "rb") as f:
image_data = base64.b64encode(f.read()).decode()
message = client.messages.create(
model="claude-3-5-sonnet-20241022",
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
}
}
]
}]
)
message = client.messages.create(
model="claude-3-5-sonnet-20241022",
max_tokens=1024,
tools=[{
"name": "get_weather",
"description": "Get the weather for a location",
"input_schema": {
"type": "object",
"properties": {
"location": {"type": "string", "description": "City name"}
},
"required": ["location"]
}
}],
messages=[{"role": "user", "content": "What's the weather in Tokyo?"}]
)
# Check for tool use
for block in message.content:
if block.type == "tool_use":
print(f"Tool: {block.name}")
print(f"Input: {block.input}")
Extended Thinking (Claude 3.7+)
For models that support extended thinking:
message = client.messages.create(
model="claude-3-7-sonnet-20250219-thinking",
max_tokens=16000,
thinking={
"type": "enabled",
"budget_tokens": 10000
},
messages=[{"role": "user", "content": "Solve this complex math problem..."}]
)
# Access thinking blocks
for block in message.content:
if block.type == "thinking":
print(f"Thinking: {block.thinking}")
elif block.type == "text":
print(f"Response: {block.text}")
Available Claude Models
| Model | Best For |
|---|
claude-3-5-sonnet-20241022 | General purpose, coding |
claude-3-5-haiku-20241022 | Fast responses |
claude-3-7-sonnet-20250219 | Latest Sonnet |
claude-3-7-sonnet-20250219-thinking | Extended thinking |
claude-opus-4-20250805 | Complex reasoning |
claude-sonnet-4-20250514 | Balanced performance |
Error Handling
from anthropic import APIError, RateLimitError, AuthenticationError
try:
message = client.messages.create(
model="claude-3-5-sonnet-20241022",
max_tokens=1024,
messages=[{"role": "user", "content": "Hello"}]
)
except AuthenticationError:
print("Invalid API key")
except RateLimitError:
print("Rate limit exceeded")
except APIError as e:
print(f"API error: {e.status_code}")
Comparison: OpenAI SDK vs Anthropic SDK
Both work with LemonData for Claude models:
| Feature | OpenAI SDK | Anthropic SDK |
|---|
| Base URL | https://api.lemondata.cc/v1 | https://api.lemondata.cc |
| Endpoint | /chat/completions | /v1/messages |
| System prompt | In messages array | Separate system parameter |
| Extended thinking | Not supported | Supported |
