StepFun API model

StepFun: stepaudio-2.5-tts

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

Start free — $2 credit View live pricing

Specs

Pricing and API details.

Transparent USD pricing. No mainland-China account or phone required. 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.

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

Endpoint

/v1/audio/speech

About stepaudio-2.5-tts

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

Pricing

Transparent USD pricing.

stepaudio-2.5-tts

$0.8056 per 10k characters. Paid in USD. 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. View live pricing

Quickstart

Copy-paste API request.

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

Internal links

Related model pages and guides.

Model directoryBrowse all models Live pricingCurrent dashboard pricing Speech and audio API guideOpen guide step-3.7-flash256K context, $0.1875/M input, $1.125/M output tokens step-tts-2$0.3889 per 10k characters step-tts-mini$0.125 per 10k characters stepaudio-2.5-asr$0.0208 per audio hour

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 above.

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.