StepAudio 2.5 TTS
StepAudio 2.5 TTS 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
- 2026-04-16
- Specialization
- text-to-speech
- Openness
- Proprietary
- License
- ProprietaryCommercial use: conditional
- Weights
- Not released
- Code
- Unknown
Cheapest of 1 route · StepFun
About
StepAudio 2.5 TTS is StepFun's contextual text-to-speech model with fine-grained expressive control. Unlike tag-based TTS systems, it accepts plain natural language instructions to control emotion, pacing, pauses, and delivery. Supports zero-shot voice cloning with full timbre and emotion control. Priced at $0.85 per 10,000 characters (input text). Supports Chinese and English. Available via StepFun API (model: step-audio-2.5-tts). Part of the unified StepAudio 2.5 architecture described in arXiv:2605.23463.
StepAudio 2.5 TTS 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. Headline tracked benchmarks include Artificial Analysis TTS Arena ELO 1187.0.
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.
Benchmark scores(1)
| Benchmark | Score | Version | Source |
|---|---|---|---|
| Artificial Analysis TTS Arena ELO | 1187.0 | arena-elo | https://artificialanalysis.ai/text-to-speech/leaderboard |
Migration checks
No linked migration route is available for this model yet.
Frequently asked questions
When was StepAudio 2.5 TTS released?
StepAudio 2.5 TTS was released on 2026-04-16.
Which providers offer StepAudio 2.5 TTS?
StepAudio 2.5 TTS is available from 1 provider: StepFun.
What benchmarks has StepAudio 2.5 TTS been tested on?
StepAudio 2.5 TTS has been evaluated on 1 benchmark, including Artificial Analysis TTS Arena ELO.
Cheapest of 1 route · StepFun