> ## Documentation Index
> Fetch the complete documentation index at: https://docs.helicone.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Anthropic

> Connect Helicone with Anthropic, a platform for running open-source language models. Monitor and optimize your AI applications using Anthropic's powerful models through a simple base_url configuration.

<Warning>
  This integration method is maintained but no longer actively developed. For the best experience and latest features, use our new [AI Gateway](/gateway/overview) with unified API access to 100+ models.
</Warning>

<Tabs>
  <Tab title="Python">
    **Change the api url and add a Helicone-Auth header**

    ```python theme={null}
    import anthropic
    client = anthropic.Client(
        api_key="<Anthropic API Key>",
        base_url="https://anthropic.helicone.ai/v1"
    )
    res = client._request_as_json(
        "post",
        "v1/complete",
        params={
            "prompt": f"{anthropic.HUMAN_PROMPT} How many toes do dogs have?{anthropic.AI_PROMPT}",
            "stop_sequences": [anthropic.HUMAN_PROMPT],
            "model": "claude-v1",
            "max_tokens_to_sample": 300,
        },
        headers={
            "Helicone-Auth": "Bearer <HELICONE_API_KEY>"
        }
    )
    ```
  </Tab>

  <Tab title="Node (TS)">
    **Node (TS)**

    Change the api base and add a Helicone-Auth header

    ```typescript theme={null}
    const anthropic = new Anthropic({
    baseURL: "https://anthropic.helicone.ai/v1",
    apiKey: "my api key",
    defaultHeaders: {
      "Helicone-Auth": "Bearer <HELICONE_API_KEY>",
    },
    });

    const stream = await anthropic.completions.create({
    prompt: `${Anthropic.HUMAN_PROMPT} Your prompt here${Anthropic.AI_PROMPT}`,
    model: "claude-2",
    stream: true,
    max_tokens_to_sample: 300,
    });

    ```
  </Tab>

  <Tab title="cURL">
    Example cURL command

    <Note>Please make sure to set environment variables for your API keys</Note>

    ```

    curl --request POST \
          --url https://anthropic.helicone.ai/v1/messages \
          --header 'Content-Type: application/json' \
          --header "Helicone-Auth: Bearer $HELICONE_API_KEY" \
          --header 'anthropic-version: 2023-06-01' \
          --header "x-api-key: $ANTHROPIC_API_KEY" \
          --data '{
            "model": "claude-3-opus-20240229",
            "max_tokens": 50,
            "system": "Respond only in Spanish.",
            "messages": [
                {
                    "role": "user",
                    "content": [
                        {
                            "type": "text",
                            "text": "Test"
                        }
                    ]
                }
            ]
    }'
    ```
  </Tab>

  <Tab title="Langchain">
    **Python**

    Change the api base and add a Helicone-Auth header

    ```python theme={null}
    anthropic = ChatAnthropic(
      temperature=0.9,
      model="claude-2",
      anthropic_api_url="https://anthropic.helicone.ai/v1",
      anthropic_api_key="ANTHROPIC_API_KEY",
      model_kwargs={
          "extra_headers":{
              "Helicone-Auth": f"Bearer {HELICONE_API_KEY}"
          }
      }
    )
    ```

    **Typescript**

    ```typescript theme={null}
    const llm = new ChatAnthropic({
      modelName: "claude-2",
      anthropicApiKey: "ANTHROPIC_API_KEY",
      clientOptions: {
        baseURL: "https://anthropic.helicone.ai/v1",
        defaultHeaders: {
          "Helicone-Auth": `Bearer HELICONE_API_KEY`,
        }
      }
    });
    ```
  </Tab>
</Tabs>

```
```