> For the complete documentation index, see [llms.txt](https://infronai.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://infronai.gitbook.io/docs/llm-apis/openai-compatible-api/overview.md).

# Overview

**Infron provides OpenAI-compatible API endpoints**, letting you use multiple AI providers through a familiar interface. You can use existing OpenAI client libraries, switch to the Infron with a URL change, and keep your current tools and workflows without code rewrites.

The OpenAI-compatible API implements the same specification as the [OpenAI API](https://platform.openai.com/docs/api-reference/chat).

### Base URL

The OpenAI-compatible API is available at the following base URL:

`https://llm.onerouter.pro/v1`

### Authentication

The OpenAI-compatible API supports the same authentication methods:

* **API key**: Use your Infron API key with the `Authorization: Bearer <token>` header

### Integration with existing tools

You can use the Infron's OpenAI-compatible API with existing tools and libraries like the [OpenAI client libraries](https://platform.openai.com/docs/libraries). Point your existing client to the Infron's base URL and use your Infron API key for authentication.

#### OpenAI client libraries

{% tabs %}
{% tab title="Python" %}

```python
from openai import OpenAI

client = OpenAI(
  base_url="https://llm.onerouter.pro/v1",
  api_key="<API_KEY>",
)

completion = client.chat.completions.create(
  model="claude-3-5-sonnet@20240620",
  messages=[
    {
      "role": "user",
      "content": "What is the meaning of life?"
    }
  ]
)

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

{% endtab %}

{% tab title="TypeScript" %}

```typescript
import OpenAI from 'openai';

const openai = new OpenAI({
  baseURL: 'https://llm.onerouter.pro/v1',
  apiKey: '<API_KEY>',
});

async function main() {
  const completion = await openai.chat.completions.create({
    model: 'claude-3-5-sonnet@20240620',
    messages: [
      {
        role: 'user',
        content: 'What is the meaning of life?',
      },
    ],
  });

  console.log(completion.choices[0].message);
}

main();
```

{% endtab %}
{% endtabs %}

### Error handling

The API returns standard HTTP status codes and error responses:

#### Common error codes

* **400**: Bad Request (invalid or missing params, CORS)
* **401**: Invalid credentials (OAuth session expired, disabled/invalid API key)
* **402**: Your account or API key has insufficient credits. Add more credits and retry the request.
* **403**: Your chosen model requires moderation and your input was flagged
* **408**: Your request timed out
* **429**: You are being rate limited
* **502**: Your chosen model is down or we received an invalid response from it
* **503**: There is no available model provider that meets your routing requirements

#### Error response format

```json
{
    "error": {
        "message": "",
        "type": "",
        "param": "",
        "code": 429
    }
}
```


---

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