StepAudio 2.5 ASR
StepAudio 2.5 ASR is worth evaluating for vision when its provider route and context window match the workload.
Use it for
- Teams evaluating vision
- Buyers comparing 1 tracked provider route
Do not use it for
- Strict JSON or tool-calling flows
- Family
- StepAudio 2.5
- Released
- 2026-05-22
- Parameters
- 4B
- Specialization
- speech-recognition
- Openness
- Proprietary
- License
- ProprietaryCommercial use: conditional
- Weights
- Not released
- Code
- Unknown
Cheapest of 1 route · StepFun
About
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.
StepAudio 2.5 ASR is a proprietary model in the StepAudio 2.5 family. The structured metadata tracks multimodal input and audio. This page tracks provider routes through StepFun. No headline benchmark score is tracked for StepAudio 2.5 ASR yet.
Top use-case fit
Vision
Included by capability and metadata signals in the decision map.
Provider price ladder
Compare API pricing across 1 providers for input and output tokens, batch, and cached reads when available.
| Provider | Input / 1M | Output / 1M | Route |
|---|---|---|---|
| StepFun | - | - | ServerlessPartial |
Capabilities
Benchmark peer barsfor Vision
No task-mapped benchmark peers are available for this model yet.
Migration checks
No linked migration route is available for this model yet.
Frequently asked questions
When was StepAudio 2.5 ASR released?
StepAudio 2.5 ASR was released on 2026-05-22.
Which providers offer StepAudio 2.5 ASR?
StepAudio 2.5 ASR is available from 1 provider: StepFun.
Cheapest of 1 route · StepFun