StepFun · read on October 27, 2026
StepFun StepAudio 2.5 TTS (Aug 2026)
StepFun StepAudio 2.5 TTS (Aug 2026) is a TTS (text-to-speech) model from StepFun. No benchmark in this index times it over 30 days, so it has no speed tier. It ranks 37 of 86 in the full ranking.
- Speed tier
- No tier
- P95 / median
- Not timed / Not timed
- Listener Elo
- 1,212
- Price per 1M chars
- $85
Where it ranks
Full ranking: 37 of 86. Use case ranks, by speed:
The tier and the ranks are computed by this site from the benchmarks' figures, not declared by StepFun.
Measurements and sources
Artificial Analysis
| Listener Elo | 1,212 |
| Listener Elo, 95% interval | 13 |
| Listener Elo, customer service | 1,243 |
| Hard passages pronounced correctly | 73% |
Details
| Provider | StepFun |
| Access | Proprietary |
| Streaming | Described by the vendor's documentation: documentation |
| Languages tested | Not collected: no benchmark here lists languages for this model |
| Measured by | Artificial Analysis |
| Official site | platform.stepfun.ai |
Not collected
Nothing below is estimated. Each line says which measure is missing and why.
- Speed (Coval median time to first audio): not measured by Coval (reading of 2026-10-27, 30-day window)
- Speed (Coval P95 time to first audio): not measured by Coval (reading of 2026-10-27, 30-day window)
- Naturalness (Speko naturalness): not measured by Speko (reading of 2026-10-27)
- Numbers and dates (Speko pronunciation score): not measured by Speko (reading of 2026-10-27)
Sources
- https://artificialanalysis.ai/text-to-speech (read on October 27, 2026)
- https://artificialanalysis.ai/text-to-speech/leaderboard/provider-voice (read on October 27, 2026)
Values are copied from these pages on the date shown. Vendor and model name agree in every source that lists it.
Compare it with the reference model: Gradium TTS vs StepFun StepAudio 2.5 TTS (Aug 2026).