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SiliconFlow (China)

stepfun-ai/Step-3.5-Flash API

SiliconFlow (China)
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
Temperature
Adjustable
Attachment
Not Supported
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
Documentation