stepfun-ai/Step-3.5-Flash API
About
Build advanced reasoning agents with stepfun-ai/Step-3.5-Flash, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.10/1M input and $0.30/1M output tokens, native tool calling support. Access stepfun-ai/Step-3.5-Flash via the SiliconFlow (China) API with up to 262K output tokens.
Capabilities
Input Modalities
text
Output Modalities
text
Reasoning
Yes
Structured Output
Yes
Tool Use
Yes
WeightsClosed
Limits
Context Window
262K
Tokens
Input Limit
262K
Tokens
Max Output
262K
Tokens
Pricing
Standard (per 1M tokens)
Input
$0.10
Output
$0.30
Frequently Asked Questions
stepfun-ai/Step-3.5-Flash by SiliconFlow (China) costs $0.10 per 1M input tokens and $0.30 per 1M output tokens.
Model Details
ID
stepfun-ai/Step-3.5-Flash
Provider
SiliconFlow (China)Family
step
Release Date
Feb 11, 2026
Knowledge Cutoff
N/A
API Integration
NPM Package
@ai-sdk/openai-compatible
Environment Variables
SILICONFLOW_CN_API_KEY
API Base URL
https://api.siliconflow.cn/v1