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Model overview

Stepfun audio models use leading speech-generation technologies to provide text-to-speech and voice cloning APIs for audio-driven experiences. Common use cases include smart customer service, audiobooks, A/V production, and game NPCs. We currently offer the following model; see the guide for details:

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Models

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step-tts-2

Next-generation TTS model with voice cloning support for natural voice interaction.

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Usage limits

  1. Max characters per request: step-tts-2 supports up to 1000 characters per call.
  2. Output formats: wav, mp3, flac, opus; default is mp3.

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Quickstart

Voice interaction developer guide

Get started with speech generation, voice cloning, and automatic speech recognition.