> ## 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.

# LiteLLM

> Using LiteLLM proxy for unified LLM access with Upsonic

## Overview

LiteLLM provides a unified OpenAI-compatible interface to access 100+ LLM providers including OpenAI, Anthropic, Azure, Google, AWS Bedrock, and more. Run it as a proxy server for centralized model management.

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

## Authentication

```bash theme={null}
export LITELLM_BASE_URL="..." # Required
# Optional: API key if proxy requires authentication
export LITELLM_API_KEY="sk-..."
```

## Examples

```python theme={null}
from upsonic import Agent, Task
from upsonic.models.litellm import LiteLLMModel

model = LiteLLMModel(model_name="gpt-4o")
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.litellm import LiteLLMModel, LiteLLMModelSettings

model = LiteLLMModel(
    model_name="gpt-4o",
    settings=LiteLLMModelSettings(max_tokens=1024, temperature=0.7)
)
agent = Agent(model=model)
```

**On the Agent:**

```python theme={null}
from upsonic import Agent, Task
from upsonic.models.litellm import LiteLLMModelSettings

agent = Agent(
    model="litellm/gpt-4o",
    settings=LiteLLMModelSettings(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   |