# sufxapi

> sufxapi is a low-latency, OpenAI-compatible AI API gateway for developers worldwide. One base URL and one API key route requests to models from OpenAI, Anthropic, Google, and other providers with transparent per-token pricing.

- API base URL: https://www.sufxapi.com/v1
- Anthropic-compatible base URL: https://www.sufxapi.com
- Authentication: `Authorization: Bearer $API_KEY` (`x-api-key` for the Claude SDK)
- Compatibility: OpenAI SDK and Claude SDK (Anthropic Messages API)
- Complete model catalog: https://www.sufxapi.com/llms-full.txt

## Models and pricing

| Model | Billing | Input (USD / 1M tokens) | Output (USD / 1M tokens) | Per request |
| --- | --- | --- | --- | --- |
| `deepseek-flash` | Tiered | — | — | — |
| `deepseek-v4-pro` | Tiered | — | — | — |
| `step-3.5-flash` | Token | $0.1 | $0.3 | — |
| `step-3.7-flash` | Token | $0.2 | $1.15 | — |
| `step-5-preview` | Token | $1 | $2.7 | — |
| `step-router-v1` | Tiered | — | — | — |
| `stepaudio-2.5-asr` | Tiered | — | — | — |
| `stepaudio-2.5-chat` | Tiered | — | — | — |
| `stepaudio-2.5-realtime` | Tiered | — | — | — |
| `stepaudio-2.5-tts` | Tiered | — | — | — |

Prices are shown in USD and use the lowest enabled group ratio. The price charged to an account is the base price multiplied by that account's group ratio; see https://www.sufxapi.com/pricing for the full table.

## Quick start

### Python (OpenAI SDK)

```python
from openai import OpenAI

client = OpenAI(base_url="https://www.sufxapi.com/v1", api_key="sk-...")

response = client.chat.completions.create(
    model="step-3.5-flash",
    messages=[{"role": "user", "content": "Hello"}],
)
print(response.choices[0].message.content)
```

### Node.js (OpenAI SDK)

```javascript
import OpenAI from "openai";

const client = new OpenAI({ baseURL: "https://www.sufxapi.com/v1", apiKey: "sk-..." });

const response = await client.chat.completions.create({
  model: "step-3.5-flash",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(response.choices[0].message.content);
```

### cURL

```bash
curl https://www.sufxapi.com/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer $API_KEY" \
  -d '{
    "model": "step-3.5-flash",
    "messages": [{"role": "user", "content": "Hello"}]
  }'
```

## Links

- [Pricing](https://www.sufxapi.com/pricing)
- [Documentation](https://www.sufxapi.com/docs)
- [About](https://www.sufxapi.com/about)
- [Full model catalog](https://www.sufxapi.com/llms-full.txt)