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StepFun (China)

StepAudio 2.5 TTS API

StepFun (China)
About

StepAudio 2.5 TTS is a high-performance LLM available via the StepFun (China) API, ideal for scalable text generation and natural language processing. This model delivers available completely free of charge. Access StepAudio 2.5 TTS via the StepFun (China) API with reliable low-latency inference.

Capabilities

Input Modalities

text

Output Modalities

audio
Reasoning
No
Structured Output
No
Tool Use
No
WeightsClosed
Temperature
Fixed
Attachment
Not Supported
Limits
Context Window
N/A

Tokens

Input Limit
N/A

Tokens

Max Output
N/A

Tokens

Pricing

Standard (per 1M tokens)

Input
Free
Output
Free
Frequently Asked Questions

StepAudio 2.5 TTS by StepFun (China) costs Free per 1M input tokens and Free per 1M output tokens.

Model Details
ID
stepaudio-2.5-tts
Provider
StepFun (China)
Family
step
Release Date
Apr 16, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
STEPFUN_API_KEY
API Base URL
https://api.stepfun.com/v1
Documentation