StepAudio 2.5 TTS API
About
StepAudio 2.5 TTS is a high-performance LLM available via the StepFun (Global) 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 (Global) 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 (Global) costs Free per 1M input tokens and Free per 1M output tokens.
Model Details
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
STEPFUN_API_KEY
API Base URL
https://api.stepfun.ai/v1