Using StepAudio 2.5 ASR on StepFun

Implementation guide · StepAudio 2.5 · StepFun

Serverless

StepFun exposes StepAudio 2.5 ASR through model ID stepaudio-2.5-asr. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-06-29. Next refresh: weekly.

Quick Start

  1. 1
    Create an account at StepFun and generate an API key.
  2. 2
    Use the StepFun SDK or REST API to call stepaudio-2.5-asr — see the documentation for request format.
API PortalDocumentationPricingModel Card

Code Examples

See StepFun documentation for integration details.

Pricing on StepFun

Capabilities

MultimodalAudio

About StepAudio 2.5 ASR

StepAudio 2.5 ASR is StepFun's automatic speech recognition model. At 4B parameters, it introduces Multi-Token Prediction (MTP) technology to parallelly predict multiple tokens per decoding step, enabling transcription of 5 minutes of audio in approximately 1 second. Achieves 400% higher throughput and 60% lower latency compared to prior StepFun ASR systems while maintaining state-of-the-art accuracy. Supports Chinese and English; accepts PCM, OGG, MP3, and WAV formats. Available via the StepFun API (model: stepaudio-2.5-asr). Part of the unified StepAudio 2.5 architecture described in arXiv:2605.23463.

Full model details →

Model Specs

Released2026-05-22
Parameters4B

More Models on StepFun

StepAudio 2.5 RealtimeStepAudio 2.5 TTS
All models on StepFun →

Provider

StepFun