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StepFun (China)

Step TTS 2 API

StepFun (China)
About

Step TTS 2 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 Step TTS 2 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

Step TTS 2 by StepFun (China) costs Free per 1M input tokens and Free per 1M output tokens.

Model Details
ID
step-tts-2
Provider
StepFun (China)
Family
step
Release Date
Mar 1, 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