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Vercel AI Gateway

StepFun 3.5 Flash API

Vercel AI Gateway
About

Build advanced reasoning agents with StepFun 3.5 Flash, a specialized AI model optimized for complex logic and chain-of-thought tasks. This model delivers cost-effective pricing at $0.09/1M input and $0.30/1M output tokens, native tool calling support. Access StepFun 3.5 Flash via the Vercel AI Gateway API with up to 262K output tokens.

Capabilities

Input Modalities

text

Output Modalities

text
Reasoning
Yes
Structured Output
No
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
$0.09
Output
$0.30

Caching (per 1M tokens)

Read
$0.02
Frequently Asked Questions

StepFun 3.5 Flash by Vercel AI Gateway costs $0.09 per 1M input tokens and $0.30 per 1M output tokens. Cached reads cost $0.02 per 1M tokens.

Model Details
ID
stepfun/step-3.5-flash
Provider
Vercel AI Gateway
Family
step
Release Date
Jan 29, 2026
Knowledge Cutoff
Jan 1, 2025
API Integration
NPM Package
@ai-sdk/gateway
Environment Variables
AI_GATEWAY_API_KEY
Documentation