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Step 3.7 Flash

StepFun’s flagship multimodal reasoning model. Powered by a 198B-parameter / 11B-activation sparse MoE architecture, with native support for image and video understanding.

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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Provider
Context
Latency
Throughput
Input
Output
Cache
Web Search
Per Query
Capabilities
ZDR
No Training
Release Date
StepFun
256K
2.0s
197tps
$0.20/M$1.15/M
Read:$0.04/M
Write:—
——
+2
05/28/2026