StepFun text-to-speech models & pricing
3 models listed · appears on 1 of 3 boards · from $40.00/1M
Chinese AI company publishing the StepAudio and Step TTS model families, including open-weights releases.
Models on the boards
ModelReleased$/1M charsBoardsComposite
StepAudio 2.5 TTS (Aug 2026)Aug 2026$85.01/361.0
Step TTS 2 (Mar 2026)Feb 2026$40.01/351.0
Step Audio EditX (Mar 2026)Open weightsFeb 2026—1/342.0
Latency from public benchmarks
Time to first audio, in milliseconds, as each benchmark publishes it. We don't measure latency ourselves, and the sources measure differently (harness, region, sample size), so each figure stays under its own source. Not part of the composite score.
None of the latency benchmarks we read lists a StepFun model yet.
Coval: Time to first audio, p50, us-east-1, read Oct 11, 2026 · Speko: Time to first audio, p50, US East, read Oct 11, 2026 · Humanness Index: Time to first audio, median, read Oct 11, 2026. How latency is sourced.