# StepFun: stepaudio-2.5-tts — API on ChinaAPI

> StepAudio 2.5 TTS — contextual speech synthesis with inline natural-language direction, expressive delivery, built-in voices, and OpenAI-compatible audio output.

- Canonical page: https://chinaapi-ru.com/models/stepaudio-2.5-tts/
- Model ID: `stepaudio-2.5-tts`
- Type: speech synthesis (TTS)
- Modalities: Text input, audio output
- Capabilities: Audio, Text-to-Speech, Contextual TTS, Style Control, Built-in Voices
- Billing: $0.8056 per 10k characters (USD)
- Endpoint: `POST https://api.chinaapi-ru.com/v1/audio/speech` (OpenAI-compatible speech endpoint)
- Pricing basis: The displayed media rate may include a service margin covering provider input/output billing, payment processing, chargeback exposure, and operations. Any margin is included in the displayed rate and is not added separately.
- Access: no mainland-China account or phone number required; $2 free trial credit
- Sign up: https://dash.chinaapi-ru.com/register?utm_source=chinaapi&utm_medium=model-md&utm_campaign=stepaudio-2.5-tts

## Quickstart

```
curl -X POST https://api.chinaapi-ru.com/v1/audio/speech \
  -H "Authorization: Bearer sk-..." \
  -H "Content-Type: application/json" \
  -d '{
    "model": "stepaudio-2.5-tts",
    "voice": "cixingnansheng",
    "input": "（轻声）Welcome to ChinaAPI. 今天我们来测试自然语音。",
    "response_format": "mp3"
  }' \
  --output speech.mp3
```

## FAQ

**How do I use stepaudio-2.5-tts?**
Use stepaudio-2.5-tts through ChinaAPI with an API key and the OpenAI-compatible endpoint shown on this page.

**How much does stepaudio-2.5-tts cost?**
stepaudio-2.5-tts is $0.8056 per 10k characters, paid in USD. The live pricing page is authoritative. The displayed media rate may include a service margin covering provider input/output billing, payment processing, chargeback exposure, and operations. Any margin is included in the displayed rate and is not added separately.

**Does stepaudio-2.5-tts need a Chinese account?**
No. ChinaAPI provides access without a mainland-China account or phone number and includes a $2 free trial. Check live pricing for the displayed USD rate.

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