Inputs
An audio file or base64 input_audio payload, depending on the model's api_mode.
audio-speech capability center
Speech-to-Text and Transcription API
Compare transcription and ASR models by exact endpoint mode, audio-hour pricing, inputs, transcript output, and limitations.
Contract
Inputs, outputs, and lifecycle.
Outputs
Transcript text or a structured transcription response.
Endpoint
POST /v1/audio/transcriptions or POST /v1/chat/completions with input_audio, according to api_mode
Lifecycle
Synchronous for the listed public endpoint modes. Persist the transcript and handle rejected file formats explicitly.
Supported tasks
One definition per task.
transcription
Limit: File size, duration, diarization, timestamps, dialect coverage, and accepted formats are unknown unless explicitly listed for the model.
Matching catalog
6 models with explicit metadata.
Unknown capabilities are omitted, never guessed from a model name. Pricing examples use the synchronized public data; live Dash Pricing remains authoritative.
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.
Tasks: video-with-audio, transcription
Endpoint: POST /v1/audio/transcriptions
Cost example: 1 audio hour × $0.35 = $0.35.
step-asr
StepFun step-asr — general-purpose speech recognition covering Chinese, English, and Chinese dialects, for transcription, meeting minutes, call quality review, and voice search. Accepts ogg, mp3, and wav uploads; transcript output is not billed.
Tasks: video-with-audio, transcription
Endpoint: POST /v1/audio/transcriptions
Cost example: 1 audio hour × $0.15 = $0.15.
step-asr-1.1
StepFun step-asr-1.1 — the updated general-purpose recognizer in the step-asr line, covering Chinese, English, and Chinese dialects. Accepts ogg, mp3, and wav uploads; transcript output is not billed.
Tasks: video-with-audio, transcription
Endpoint: POST /v1/audio/transcriptions
Cost example: 1 audio hour × $0.35 = $0.35.
mimo-v2.5-asr
Xiaomi MiMo-V2.5-ASR — speech recognition for Chinese, English, code-switching, regional dialects, noisy recordings, far-field audio, multiple speakers, and lyrics.
Tasks: video-with-audio, transcription
Endpoint: POST /v1/chat/completions
Cost example: 1 audio hour × $0.074 = $0.074.
qwen3-asr-flash
Qwen3-ASR-Flash — multilingual file transcription with language hints, inverse text normalization, emotion recognition, and OpenAI-compatible audio input.
Tasks: video-with-audio, transcription
Endpoint: POST /v1/audio/transcriptions
Cost example: 1 audio hour × $0.123539 = $0.123539.
stepaudio-2.5-asr
StepAudio 2.5 ASR — a 4B MTP streaming transcription model for fast Chinese-English recognition, ITN normalization, subtitles, meetings, and voice agents.
Tasks: video-with-audio, transcription
Endpoint: POST /v1/audio/transcriptions
Cost example: 1 audio hour × $0.022 = $0.022.
Run or estimate before registration.
Calculate API cost · Generate curl, Python, or JavaScript · Install the Seedance 2 Agent Recipe
Source and method: public model pricing dataset, updated 2026-08-08. Limitations are stated above; third-party claims remain next to the model pages that cite them.