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

# prefix completion

## 1. Use Cases

In prefix-based completion, users provide desired prefix information, enabling the model to complete the remaining content based on the provided prefix.
With this capability, the model demonstrates improved instruction-following ability, meeting user requirements for specific formats in certain scenarios.

## 2. How to Use

How to Use

```json theme={null}
extra_body={"prefix": "prefix content"}
```

## 3. Supported Models

Currently, large language models support the above parameter.

Note: The list of supported models may change. Please refer to this documentation for the latest supported models.

## 4. Example Usage

Below is an example of using prefix-based completion with the OpenAI library:

````python theme={null}
client = OpenAI(
    api_key="Your API KEY", # get from https://dash.horay.ai/account/ak
    base_url="https://api.horay.ai/v1"
)
 
messages = [
    {"role": "user", "content": "Please write quick sort code"},
]

response = client.chat.completions.create(
    model="deepseek-ai/DeepSeek-V2.5",
    messages=messages,
    extra_body={"prefix":"```python\n"}
)

print(response.choices[0].message.content)
````