# Observability for Together AI with Opik

> Start here to integrate Opik into your Together AI-based genai application for end-to-end LLM observability, unit testing, and optimization.

[Together AI](https://www.together.ai/) provides fast inference for leading open-source models including Llama, Mistral, Qwen, and many others.

This guide explains how to integrate Opik with Together AI via LiteLLM. By using the LiteLLM integration provided by Opik, you can easily track and evaluate your Together AI calls within your Opik projects as Opik will automatically log the input prompt, model used, token usage, and response generated.

## Getting Started

### Configuring Opik

To start tracking your Together AI calls, you'll need to have both `opik` and `litellm` installed. You can install them using pip:

```bash
pip install opik litellm
```

In addition, you can configure Opik using the `opik configure` command which will prompt you for the correct local server address or if you are using the Cloud platform your API key:

```bash
opik configure
```

### Configuring Together AI

You'll need to set your Together AI API key as an environment variable:

```bash
export TOGETHER_API_KEY="YOUR_API_KEY"
```

## Logging LLM calls

In order to log the LLM calls to Opik, you will need to create the OpikLogger callback. Once the OpikLogger callback is created and added to LiteLLM, you can make calls to LiteLLM as you normally would:

```python
from litellm.integrations.opik.opik import OpikLogger
import litellm

opik_logger = OpikLogger()
litellm.callbacks = [opik_logger]

response = litellm.completion(
    model="together_ai/meta-llama/Llama-3.2-3B-Instruct-Turbo",
    messages=[
        {"role": "user", "content": "Why is tracking and evaluation of LLMs important?"}
    ]
)
```

## Logging LLM calls within a tracked function

If you are using LiteLLM within a function tracked with the [`@track`](/tracing/log_traces#using-function-decorators) decorator, you will need to pass the `current_span_data` as metadata to the `litellm.completion` call:

```python
from opik import track, opik_context
import litellm

@track
def generate_story(prompt):
    response = litellm.completion(
        model="together_ai/meta-llama/Llama-3.2-3B-Instruct-Turbo",
        messages=[{"role": "user", "content": prompt}],
        metadata={
            "opik": {
                "current_span_data": opik_context.get_current_span_data(),
            },
        },
    )
    return response.choices[0].message.content


@track
def generate_topic():
    prompt = "Generate a topic for a story about Opik."
    response = litellm.completion(
        model="together_ai/meta-llama/Llama-3.2-90B-Vision-Instruct-Turbo",
        messages=[{"role": "user", "content": prompt}],
        metadata={
            "opik": {
                "current_span_data": opik_context.get_current_span_data(),
            },
        },
    )
    return response.choices[0].message.content


@track
def generate_opik_story():
    topic = generate_topic()
    story = generate_story(topic)
    return story


generate_opik_story()
```