Claude Sonnet 5.5

{
  "id": "anthropic/claude-sonnet-5-5",
  "name": "Claude Sonnet 5.5",
  "description": "Fast Claude model for everyday coding, agents, and knowledge work",
  "family": "claude-sonnet",
  "last_updated": "2026-09-28",
  "knowledge": "2026-06",
  "attachment": true,
  "reasoning": true,
  "tool_call": true,
  "temperature": false,
  "modalities": {
    "input": [
      "text",
      "image",
      "pdf"
    ],
    "output": [
      "text"
    ]
  },
  "limit": {
    "context": 1000000,
    "output": 128000
  },
  "benchmarks": [
    {
      "name": "Terminal-Bench",
      "score": 70.6,
      "source": "https://www.anthropic.com/claude-sonnet-5-5",
      "metric": "score",
      "version": "4.0",
      "date": "2026-09-28"
    },
    {
      "name": "FrontierCode",
      "score": 46.2,
      "source": "https://www.anthropic.com/claude-sonnet-5-5",
      "metric": "score",
      "variant": "max effort",
      "dataset": "Main",
      "version": "1.1",
      "date": "2026-09-28"
    },
    {
      "name": "CursorBench",
      "score": 55.5,
      "source": "https://www.anthropic.com/claude-sonnet-5-5",
      "metric": "score",
      "version": "4.0",
      "date": "2026-09-28"
    },
    {
      "name": "GDPval-AA",
      "score": 1844,
      "source": "https://www.anthropic.com/claude-sonnet-5-5",
      "metric": "Elo",
      "version": "2.1",
      "date": "2026-09-28"
    },
    {
      "name": "Humanity's Last Exam",
      "score": 64.5,
      "source": "https://www.anthropic.com/claude-sonnet-5-5",
      "metric": "score",
      "variant": "with tools",
      "date": "2026-09-28"
    },
    {
      "name": "OSWorld",
      "score": 80.1,
      "source": "https://www.anthropic.com/claude-sonnet-5-5",
      "metric": "partial score",
      "version": "2.1",
      "date": "2026-09-28"
    }
  ],
  "release_date": "2026-09-28",
  "open_weights": false
}