StepFun API model

StepFun: step-tts-2

Step TTS 2 — expressive speech synthesis with official and cloned voices, speed and volume control, pronunciation mapping, and multiple output formats.

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, Voice Cloning, Emotion, Pronunciation Control

Billing

$0.4 per 10k characters

Endpoint

/v1/audio/speech

About step-tts-2

Step TTS 2 — expressive speech synthesis with official and cloned voices, speed and volume control, pronunciation mapping, and multiple output formats.

Pricing

Transparent USD pricing.

step-tts-2

$0.4 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.ai/v1/audio/speech \
  -H "Authorization: Bearer $CHINAAPI_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "step-tts-2",
    "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-3.5-flash256K context, $0.1/M input, $0.3/M output tokens step-3.5-flash-2603256K context, $0.1/M input, $0.3/M output tokens step-1o-turbo-vision32K context, $0.4/M input, $1.28/M output tokens step-2x-large$0.0155 per image

How do I use step-tts-2?

Use step-tts-2 through ChinaAPI with an API key and the OpenAI-compatible endpoint shown above.

How much does step-tts-2 cost?

step-tts-2 is $0.4 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 step-tts-2 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.