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

# OpenRouter

> Using OpenRouter for unified access to multiple LLM providers with Upsonic

## Overview

OpenRouter provides unified access to models from OpenAI, Anthropic, Google, Meta, and many others through a single API. Simplifies multi-model applications with consistent pricing and routing.

**Model Class:** `OpenAIChatModel` (OpenAI-compatible API)

## Authentication

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

## Examples

```python theme={null}
from upsonic import Agent, Task
from upsonic.models.openrouter import OpenRouterModel

model = OpenRouterModel(model_name="anthropic/claude-3-5-sonnet")
agent = Agent(model=model)

task = Task("Hello, how are you?")
result = agent.do(task)
print(result)
```

## Model Settings

You can set model parameters in two ways: on the model or on the Agent.

**On the model:**

```python theme={null}
from upsonic import Agent, Task
from upsonic.models.openrouter import OpenRouterModel, OpenRouterModelSettings

model = OpenRouterModel(
    model_name="anthropic/claude-3-5-sonnet",
    settings=OpenRouterModelSettings(max_tokens=1024, temperature=0.7)
)
agent = Agent(model=model)
```

**On the Agent:**

```python theme={null}
from upsonic import Agent, Task
from upsonic.models.openrouter import OpenRouterModelSettings

agent = Agent(
    model="openrouter/anthropic/claude-3-5-sonnet",
    settings=OpenRouterModelSettings(max_tokens=1024, temperature=0.7)
)
```

## Parameters

| Parameter | Type | Description | Default | Source |
| - | - | - | - | - |
| `max_tokens` | `int` | Maximum tokens to generate | Model default | Base |
| `temperature` | `float` | Sampling temperature (0.0-2.0) | 1.0 | Base |
| `top_p` | `float` | Nucleus sampling | 1.0 | Base |
| `seed` | `int` | Random seed | None | Base |
| `stop_sequences` | `list[str]` | Stop sequences | None | Base |
| `presence_penalty` | `float` | Token presence penalty | 0.0 | Base |
| `frequency_penalty` | `float` | Token frequency penalty | 0.0 | Base |
| `parallel_tool_calls` | `bool` | Allow parallel tools | True | Base |
| `timeout` | `float` | Request timeout (seconds) | 600 | Base |


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