Step 3.5 Flash

稀疏 MoE 推理模型（总参数 196B，激活参数 11B），面向智能体和长程任务。

StepFunstep-3.5-flash报告数据错误

规格

上下文: 262.1K
最大输出: —
输入价: $0.1/ 百万 Token
输出价: $0.3/ 百万 Token
发布日期: —

上下文

上下文: 262.1K
最大输入: —
最大输出: —

价格 · USD / 百万 Token

输入: $0.1
输出: $0.3
缓存读取: $0.02
缓存写入: —

输入输出

输入: 文本
输出: 文本

API

接口类型: chatmessages

思考

支持思考: 支持
思考等级: —

源信息

状态: 可用
发布日期: —
知识截止: —

能力

已确认: toolsstreamingcaching

调用方式

stepfunmodel = step-3.5-flash

chat

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

messages

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

JSON

step-3.5-flash.json

{
  "id": "step-3.5-flash",
  "object": "model",
  "created": null,
  "owned_by": "stepfun",
  "name": "Step 3.5 Flash",
  "api": {
    "types": [
      "chat",
      "messages"
    ]
  },
  "limits": {
    "context": 262144,
    "input": null,
    "output": null
  },
  "modalities": {
    "input": [
      "text"
    ],
    "output": [
      "text"
    ]
  },
  "reasoning": {
    "supported": true,
    "efforts": []
  },
  "pricing": {
    "currency": "USD",
    "unit": "1M_tokens",
    "input": 0.1,
    "output": 0.3,
    "cache_read": 0.02,
    "cache_write": null
  },
  "features": [
    "tools",
    "streaming",
    "caching"
  ],
  "info": {
    "status": "active",
    "release_date": null,
    "knowledge_cutoff": null,
    "description": "Sparse MoE reasoning model (196B total, 11B active) for agents and long-horizon tasks.",
    "docs": "https://platform.stepfun.ai/docs/en/guides/models/step-3.5-flash",
    "verified_at": "2026-10-11"
  }
}

官方来源

Step Platform pricing | StepFun Documentationplatform.stepfun.ai2026-10-10 Model overview | StepFun Documentationplatform.stepfun.ai2026-10-10 Chat completion | StepFun API referenceplatform.stepfun.ai2026-10-10 Step 3.5 Flash | StepFun Documentationplatform.stepfun.ai2026-10-10 Messages API | StepFun Documentationplatform.stepfun.ai2026-10-11