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StepFun API model

StepFun: stepaudio-2-asr-pro

StepFun StepAudio 2 ASR Pro — 32B-parameter speech recognition, the accuracy-first option in the StepFun ASR line where stepaudio-2.5-asr is the speed-and-cost option. Accepts ogg, mp3, and wav uploads; transcript output is not billed.

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 recognition (ASR)

Modalities

Audio input, text output

Capabilities

Audio, Speech-to-Text

Billing

$0.35 per audio hour

Endpoint

/v1/audio/transcriptions

About stepaudio-2-asr-pro

StepFun StepAudio 2 ASR Pro — 32B-parameter speech recognition, the accuracy-first option in the StepFun ASR line where stepaudio-2.5-asr is the speed-and-cost option. Accepts ogg, mp3, and wav uploads; transcript output is not billed.

Pricing

Transparent USD pricing.

stepaudio-2-asr-pro

$0.35 per audio hour. 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/transcriptions \
  -H "Authorization: Bearer $CHINAAPI_API_KEY" \
  -F "model=stepaudio-2-asr-pro" \
  -F "[email protected]" \
  -F "response_format=json"

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 stepaudio-2-asr-pro?

Use stepaudio-2-asr-pro through ChinaAPI with an API key and the OpenAI-compatible endpoint shown above.

How much does stepaudio-2-asr-pro cost?

stepaudio-2-asr-pro is $0.35 per audio hour, 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-asr-pro 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.