{
  "apiVersion": "v1",
  "methodology": "https://sourcescore.org/methodology/",
  "canonical": "https://sourcescore.org/claims/f82eba5c7f5fa09f/",
  "claim": {
    "vertical": "ai-ml",
    "subject": "Anthropic Claude Sonnet 4",
    "predicate": "released_on",
    "object": "2025-05-22 by Anthropic",
    "confidence": 1,
    "sources": [
      {
        "url": "https://www.anthropic.com/news/claude-4",
        "title": "Introducing Claude 4 — Sonnet 4 and Opus 4",
        "publisher": "Anthropic",
        "publishedDate": "2025-05-22",
        "accessedDate": "2026-05-16",
        "type": "official-blog",
        "excerpt": "Claude Sonnet 4 is a significant upgrade to Claude Sonnet 3.5, delivering superior coding and reasoning while responding more precisely to your instructions."
      },
      {
        "url": "https://docs.anthropic.com/en/docs/about-claude/models",
        "title": "Claude models — Anthropic documentation",
        "publisher": "Anthropic",
        "publishedDate": "2025-05-22",
        "accessedDate": "2026-05-16",
        "type": "docs"
      }
    ],
    "publishedAt": "2026-05-16T00:00:00Z",
    "lastVerified": "2026-05-16",
    "methodologyVersion": "veritas-v0.1",
    "tags": [
      "claude-sonnet-4",
      "claude-4",
      "anthropic",
      "released_on",
      "2025"
    ],
    "id": "f82eba5c7f5fa09f",
    "statement": "Anthropic Claude Sonnet 4 released on: 2025-05-22 by Anthropic."
  },
  "signature": {
    "algorithm": "HMAC-SHA256",
    "signedBy": "did:web:sourcescore.org",
    "signedAt": "2026-05-17T00:00:00.000Z",
    "signature": "13e0c7af27813fe80c47e8ea15b7eab6b9ab880eaecba15dcb1aa3943b6a6f5b"
  },
  "citedAs": "Anthropic Claude Sonnet 4 released on: 2025-05-22 by Anthropic. — SourceScore Claim f82eba5c7f5fa09f (verified 2026-05-16, signed 13e0c7af…). https://sourcescore.org/claims/f82eba5c7f5fa09f/"
}