ModelInfo
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Step 3.7 Flash

Sparse MoE multimodal reasoning model (198B total, 11B active) with image and video understanding.

StepFunstep-3.7-flash2026-05-29Report incorrect data

Specs

Context
262.1K
Max output
—
Input price
$0.2/ 1M tokens
Output price
$1.15/ 1M tokens
Released
2026-05-29

Context

Context window
262.1K
Max input
—
Max output
—

Pricing · USD / 1M tokens

Input
$0.2
Output
$1.15
Cache read
$0.04
Cache write
—

Modalities

Input
TextImageVideo
Output
Text

API

API types
chatmessages

Reasoning

Reasoning
Yes
Levels
lowmediumhigh

Info

Status
Active
Released
2026-05-29
Knowledge cutoff
—

Features

Confirmed
toolsstreamingcaching
Source · official docsVerified 2026-10-11

How to call

1 provider

stepfunmodel = step-3.7-flashreasoning = reasoning_effort

chat
POSThttps://api.stepfun.ai/v1/chat/completions
messages
POSThttps://api.stepfun.ai/v1/messages

JSON

Standard format
step-3.7-flash.json
{
  "id": "step-3.7-flash",
  "object": "model",
  "created": 1780012800,
  "owned_by": "stepfun",
  "name": "Step 3.7 Flash",
  "api": {
    "types": [
      "chat",
      "messages"
    ]
  },
  "limits": {
    "context": 262144,
    "input": null,
    "output": null
  },
  "modalities": {
    "input": [
      "text",
      "image",
      "video"
    ],
    "output": [
      "text"
    ]
  },
  "reasoning": {
    "supported": true,
    "efforts": [
      "low",
      "medium",
      "high"
    ]
  },
  "pricing": {
    "currency": "USD",
    "unit": "1M_tokens",
    "input": 0.2,
    "output": 1.15,
    "cache_read": 0.04,
    "cache_write": null
  },
  "features": [
    "tools",
    "streaming",
    "caching"
  ],
  "info": {
    "status": "active",
    "release_date": "2026-05-29",
    "knowledge_cutoff": null,
    "description": "Sparse MoE multimodal reasoning model (198B total, 11B active) with image and video understanding.",
    "docs": "https://platform.stepfun.ai/docs/en/guides/models/step-3.7-flash",
    "verified_at": "2026-10-11"
  }
}

Official sources

6