litellm/litellm/anthropic_interface

Use LLM API endpoints in Anthropic Interface

Note: This is called anthropic_interface because anthropic is a known python package and was failing mypy type checking.

Usage

---

LiteLLM Python SDK

Non-streaming example

import litellm
response = await litellm.anthropic.messages.acreate(
    messages=[{"role": "user", "content": "Hello, can you tell me a short joke?"}],
    api_key=api_key,
    model="anthropic/claude-3-haiku-20240307",
    max_tokens=100,
)

Example response:

{
  "content": [
    {
      "text": "Hi! this is a very short joke",
      "type": "text"
    }
  ],
  "id": "msg_013Zva2CMHLNnXjNJJKqJ2EF",
  "model": "claude-3-7-sonnet-20250219",
  "role": "assistant",
  "stop_reason": "end_turn",
  "stop_sequence": null,
  "type": "message",
  "usage": {
    "input_tokens": 2095,
    "output_tokens": 503,
    "cache_creation_input_tokens": 2095,
    "cache_read_input_tokens": 0
  }
}

Streaming example

import litellm
response = await litellm.anthropic.messages.acreate(
    messages=[{"role": "user", "content": "Hello, can you tell me a short joke?"}],
    api_key=api_key,
    model="anthropic/claude-3-haiku-20240307",
    max_tokens=100,
    stream=True,
)
async for chunk in response:
    print(chunk)

LiteLLM Proxy Server

1. Setup config.yaml

model_list:
    - model_name: anthropic-claude
      litellm_params:
        model: claude-3-7-sonnet-latest

2. Start proxy

litellm --config /path/to/config.yaml

3. Test it!

import anthropic

# point anthropic sdk to litellm proxy 
client = anthropic.Anthropic(
    base_url="http://0.0.0.0:4000",
    api_key="<your-master-key>",
)

response = client.messages.create(
    messages=[{"role": "user", "content": "Hello, can you tell me a short joke?"}],
    model="anthropic/claude-3-haiku-20240307",
    max_tokens=100,
)

curl -L -X POST 'http://0.0.0.0:4000/v1/messages' \
-H 'content-type: application/json' \
-H 'x-api-key: $LITELLM_API_KEY' \
-H 'anthropic-version: 2023-06-01' \
-d '{
  "model": "anthropic-claude",
  "messages": [
    {
      "role": "user",
      "content": "Hello, can you tell me a short joke?"
    }
  ],
  "max_tokens": 100
}'