Step 3.5 Flash 2603

{
  "id": "step-3.5-flash-2603",
  "object": "model",
  "created": null,
  "owned_by": "stepfun",
  "name": "Step 3.5 Flash 2603",
  "api": {
    "types": [
      "chat",
      "messages"
    ]
  },
  "limits": {
    "context": 262144,
    "input": null,
    "output": null
  },
  "modalities": {
    "input": [
      "text"
    ],
    "output": [
      "text"
    ]
  },
  "reasoning": {
    "supported": true,
    "efforts": [
      "low",
      "high"
    ]
  },
  "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": "Step 3.5 Flash tuned for high-frequency agent workloads, with a low-reasoning mode.",
    "docs": "https://platform.stepfun.ai/docs/en/guides/models/step-3.5-flash",
    "verified_at": "2026-10-11"
  }
}