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StepFun

Step 3.7 Flash

Step 3.7 Flash is StepFun's flagship multimodal reasoning model, a sparse MoE with 11B active parameters and native image and video understanding. It supports a context window of 256K tokens and a max output of 256K tokens per request.

Implicit CachingReasoningTool UseVision (Image)
index.ts
import { streamText } from 'ai'


const result = streamText({
  model: 'stepfun/step-3.7-flash',
  prompt: 'Why is the sky blue?'
})
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Providers

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Provider
Context
Latency
Throughput
Input
Output
Cache
Web Search
Per Query
Capabilities
ZDR
No Training
Release Date
StepFun
256K
9.9s
171tps
$0.20/M$1.15/M
Read:$0.04/M
Write:—
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+2
05/28/2026