> ## 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.

# Cerebras

> Using Cerebras API for fast inference with Upsonic

## Overview

Cerebras provides an OpenAI-compatible API at `https://api.cerebras.ai/v1` for fast inference. Some OpenAI parameters are not supported: `frequency_penalty`, `logit_bias`, `presence_penalty`, `parallel_tool_calls`, and `service_tier`.

**Model Class:** `CerebrasModel`

## Authentication

```bash theme={null}
export CEREBRAS_API_KEY="..."
```

## Examples

```python theme={null}
from upsonic import Agent, Task
from upsonic.models.cerebras import CerebrasModel

model = CerebrasModel(model_name="gpt-oss-120b")
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.cerebras import CerebrasModel, CerebrasModelSettings

model = CerebrasModel(
    model_name="gpt-oss-120b",
    settings=CerebrasModelSettings(max_tokens=1024, temperature=0.7)
)
agent = Agent(model=model)
```

**On the Agent:**

```python theme={null}
from upsonic import Agent, Task
from upsonic.models.cerebras import CerebrasModelSettings

agent = Agent(
    model="cerebras/gpt-oss-120b",
    settings=CerebrasModelSettings(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   |
| `timeout`        | `float`     | Request timeout (seconds)      | 600           | Base   |

**Not supported by Cerebras:** `presence_penalty`, `frequency_penalty`, `logit_bias`, `parallel_tool_calls`, `service_tier`. Omit these in settings when using the Cerebras provider.