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

# OpenRouter

> Access 100+ models through a single API.

[OpenRouter](https://openrouter.ai) provides access to models from OpenAI, Anthropic, Google, Meta, and more through a single API.

## Setup

```bash theme={null}
export OPENROUTER_API_KEY="sk-or-..."
```

## Basic Usage

```python theme={null}
from definable.model.openrouter import OpenRouter
from definable.model.message import Message

model = OpenRouter(id="meta-llama/llama-3-70b")
response = model.invoke(
    messages=[Message(role="user", content="Hello!")],
    assistant_message=Message(role="assistant", content=""),
)
print(response.content)
```

## String Shorthand

```python theme={null}
agent = Agent(model="openrouter/meta-llama/llama-3-70b")
```

## Parameters

<ParamField path="id" type="str" required>
  Model identifier from the [OpenRouter model list](https://openrouter.ai/models).
</ParamField>

<ParamField path="api_key" type="str">
  OpenRouter API key. Defaults to `OPENROUTER_API_KEY`.
</ParamField>

<ParamField path="temperature" type="float">
  Sampling temperature.
</ParamField>

<ParamField path="max_tokens" type="int">
  Maximum output tokens.
</ParamField>

## Imports

```python theme={null}
from definable.model.openrouter import OpenRouter
```