{
  "checked": "2026-11-11",
  "currency": "USD",
  "unit": "per million tokens",
  "sources": {
    "pricing": "https://platform.claude.com/docs/en/about-claude/pricing",
    "systemCard": "https://www.anthropic.com/document/claude-fable-5-2-mythos-5-2-system-card",
    "independent": "https://artificialanalysis.ai/models/releases/claude-fable-5-2"
  },
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    "opus55": { "input": 4, "output": 20, "cacheWrite5m": 5, "cacheWrite1h": 8, "cacheRead": 0.2 },
    "fable51": { "input": 10, "output": 50, "cacheWrite5m": 12.5, "cacheWrite1h": 20, "cacheRead": 0.25 }
  },
  "examples": [
    { "name": "Uncached request", "usage": { "input": 100000, "output": 10000 }, "expected": { "fable52": 1.2, "opus55": 0.6 } },
    { "name": "Warm cache", "usage": { "cacheRead": 200000, "output": 2000 }, "expected": { "fable52": 0.12, "opus55": 0.08 } },
    { "name": "Mixed request", "usage": { "input": 20000, "cacheRead": 200000, "output": 5000 }, "expected": { "fable52": 0.4, "opus55": 0.22 } }
  ],
  "frontierCode": {
    "sourceSection": "8.4, pages 209-210",
    "method": "Reported Cognition FrontierCode 2.0 evaluation; not an independent benchmark for this article; no uncertainty interval supplied",
    "rows": [
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      { "effort": "medium", "score": 37.6, "cost": 2.48 },
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      { "effort": "xhigh", "score": 49.1, "cost": 14.19 },
      { "effort": "max", "score": 45.7, "cost": 44.7 }
    ]
  },
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    "method": "Deliberately weakened sandboxes; not real-world incident frequencies",
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      { "model": "Opus 5.5", "reach": 20, "use": 3.3 },
      { "model": "Sonnet 5.5", "reach": 21, "use": 5.1 }
    ]
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}