Using StepAudio 2.5 Realtime on StepFun

Implementation guide · StepAudio 2.5 · StepFun

Serverless

StepFun exposes StepAudio 2.5 Realtime through model ID step-2.5-realtime. Use the setup steps, sourced pricing, capabilities, and official provider links below to validate this route before deployment.

Last refreshed 2026-06-29. Next refresh: weekly.

Quick Start

  1. 1
    Create an account at StepFun and generate an API key.
  2. 2
    Use the StepFun SDK or REST API to call step-2.5-realtime — see the documentation for request format.
API PortalDocumentationPricingModel Card

Code Examples

See StepFun documentation for integration details.

Pricing on StepFun

Capabilities

MultimodalAudio

About StepAudio 2.5 Realtime

StepAudio 2.5 Realtime is StepFun's end-to-end real-time conversational voice model. It handles speech input and produces speech output through a single unified architecture with no intermediate ASR/TTS pipeline steps. Key capabilities include persona-consistent roleplay via dedicated RLHF training on million-scale persona data, paralinguistic comprehension (detecting and responding to tone, emotion, and speaking rate), and low-latency dialogue. Supports Chinese and English. Available via WebSocket API (step-2.5-realtime). Analogous in function to OpenAI's GPT Realtime models.

Full model details →

Model Specs

Released2026-05-24

More Models on StepFun

StepAudio 2.5 ASRStepAudio 2.5 TTS
All models on StepFun →

Provider

StepFun