{
  "site": "Agentic Weekly",
  "dataset": "Agentic Weekly model facts",
  "as_of": "2026-10-26",
  "license": {
    "name": "CC BY 4.0",
    "url": "https://creativecommons.org/licenses/by/4.0/"
  },
  "attribution": "Data: Agentic Weekly (https://theagenticweekly.com), CC BY 4.0",
  "page": "https://theagenticweekly.com/models",
  "evidence_labels": {
    "Reported": "Read from the cited vendor page on the as-of date; not run by us.",
    "Tested": "We ran it ourselves; scope is stated in tested_note. No model is Tested yet."
  },
  "model": {
    "slug": "claude-opus-5-5",
    "name": "Claude Opus 5.5",
    "vendor": "Anthropic",
    "family": "Claude",
    "category": "llm",
    "status": "generally-available",
    "groups": [
      "frontier",
      "coding",
      "agents",
      "reasoning"
    ],
    "short_answer": "Claude Opus 5.5 is an Anthropic language model released Sep 22, 2026; Anthropic's newest language model in our dataset is Claude Haiku 5.5. Proprietary, API access only. Anthropic's recommended starting model for most workloads, which Anthropic says leads in agentic coding and knowledge work. Verified against vendor sources on Oct 26, 2026.",
    "summary": "Anthropic's recommended starting model for most workloads, which Anthropic says leads in agentic coding and knowledge work.",
    "release_date": "2026-09-22",
    "latest_update": null,
    "api_id": "claude-opus-5-5",
    "context_tokens": 1000000,
    "max_output_tokens": 128000,
    "input_modalities": [
      "text",
      "image"
    ],
    "output_modalities": [
      "text"
    ],
    "parameters": null,
    "license": "Proprietary (API)",
    "open_weights": false,
    "pricing": {
      "currency": "USD",
      "unit": "per 1M tokens",
      "input": 4,
      "output": 20,
      "text": "$4 in / $20 out per 1M tokens"
    },
    "evidence": "Reported",
    "tested_note": null,
    "last_verified": "2026-10-26",
    "is_stale": false,
    "facts": {
      "release_date": {
        "value": "2026-09-22",
        "source_url": "https://www.anthropic.com/news",
        "as_of": "2026-10-26",
        "evidence": "Reported"
      },
      "api_id": {
        "value": "claude-opus-5-5",
        "source_url": "https://platform.claude.com/docs/en/about-claude/models/overview",
        "as_of": "2026-10-26",
        "evidence": "Reported"
      },
      "context_tokens": {
        "value": 1000000,
        "source_url": "https://platform.claude.com/docs/en/about-claude/models/overview",
        "as_of": "2026-10-26",
        "evidence": "Reported"
      },
      "max_output_tokens": {
        "value": 128000,
        "source_url": "https://platform.claude.com/docs/en/about-claude/models/overview",
        "as_of": "2026-10-26",
        "evidence": "Reported"
      },
      "input_modalities": {
        "value": [
          "text",
          "image"
        ],
        "source_url": "https://platform.claude.com/docs/en/about-claude/models/overview",
        "as_of": "2026-10-26",
        "evidence": "Reported"
      },
      "output_modalities": {
        "value": [
          "text"
        ],
        "source_url": "https://platform.claude.com/docs/en/about-claude/models/overview",
        "as_of": "2026-10-26",
        "evidence": "Reported"
      },
      "license": {
        "value": {
          "type": "proprietary",
          "name": "Proprietary (API)",
          "openWeights": false
        },
        "source_url": "https://platform.claude.com/docs/en/about-claude/models/overview",
        "as_of": "2026-10-26",
        "evidence": "Reported"
      },
      "pricing": {
        "value": {
          "currency": "USD",
          "unit": "per 1M tokens",
          "input": 4,
          "output": 20
        },
        "source_url": "https://platform.claude.com/docs/en/about-claude/models/overview",
        "as_of": "2026-10-26",
        "evidence": "Reported"
      }
    },
    "vendor_claims": [
      "Vendor claim (Anthropic newsroom): \"leads in agentic coding and knowledge work, and costs 40% less to run than Opus 5 on typical workloads.\"",
      "Anthropic's models overview says to start with Opus 5.5 for most workloads."
    ],
    "notes": [],
    "not_verified": [],
    "sources": [
      {
        "label": "Anthropic models overview",
        "url": "https://platform.claude.com/docs/en/about-claude/models/overview"
      },
      {
        "label": "Anthropic newsroom",
        "url": "https://www.anthropic.com/news"
      }
    ],
    "url": "https://theagenticweekly.com/models/claude-opus-5-5",
    "markdown": "https://theagenticweekly.com/models/claude-opus-5-5.md",
    "api": "https://theagenticweekly.com/api/models/claude-opus-5-5"
  }
}