{
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  "_kind": "ModelVersion",
  "_file": "compute/models/claude-fable-5.yaml",
  "_cluster": "compute",
  "attributes": {
    "displayName": "Claude Fable 5",
    "modelFamilyId": "model-family:claude-fable",
    "versionRange": ">=5.0.0 <5.1.0",
    "kind": "reasoning",
    "contextWindowTokens": 1000000,
    "maxOutputTokens": 128000,
    "costPerMTokInput": 10,
    "costPerMTokCachedInput": 1,
    "costPerMTokCacheWrite5m": 12.5,
    "costPerMTokCacheWrite1h": 20,
    "costPerMTokOutput": 50,
    "supportsExtendedThinking": false,
    "supportsAdaptiveThinking": true,
    "supportsThinking": true,
    "supportsThinkingBudgetTokens": true,
    "supportsRefusals": true,
    "pricingNotes": "Batch API pricing is $5/MTok input and $25/MTok output; Claude Fable 5 refusals that produce no output are not billed.",
    "modalities": [
      "text",
      "image"
    ],
    "modalityDirections": [
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        "direction": "input"
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      {
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        "direction": "input"
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      {
        "kind": "text",
        "direction": "output"
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    ],
    "capabilityTags": [
      "long-context",
      "long-horizon-agents",
      "adaptive-thinking",
      "code-execution",
      "memory-tool",
      "programmatic-tool-calling",
      "vision",
      "refusals"
    ],
    "releaseDate": "2026-06-09",
    "lifecycleStatus": "ga",
    "lifecycleStatusChangedAt": "2026-06-09",
    "modelCardUrl": "https://platform.claude.com/docs/en/about-claude/models/introducing-claude-fable-5-and-claude-mythos-5.md",
    "supportsFineTuning": false,
    "regions": [
      "global"
    ],
    "providerModelIds": [
      "claude-fable-5",
      "anthropic.claude-fable-5"
    ],
    "providerAvailability": [
      {
        "provider": "provider:anthropic",
        "status": "ga",
        "announcedAt": "2026-06-09",
        "modelId": "claude-fable-5",
        "transport": "model-transport:anthropic-messages",
        "evidenceSourceIds": [
          "evidence:anthropic-fable-mythos-5-launch-issue-991-992"
        ]
      },
      {
        "provider": "provider:aws-bedrock",
        "status": "ga",
        "announcedAt": "2026-06-09",
        "modelId": "anthropic.claude-fable-5",
        "transport": "model-transport:anthropic-messages",
        "evidenceSourceIds": [
          "evidence:anthropic-fable-mythos-5-models-overview-issue-991-992"
        ]
      },
      {
        "provider": "provider:gcp-vertex",
        "status": "ga",
        "announcedAt": "2026-06-09",
        "modelId": "claude-fable-5",
        "transport": "model-transport:vertex-anthropic-messages",
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        "announcedAt": "2026-06-09",
        "evidenceSourceIds": [
          "evidence:anthropic-fable-mythos-5-launch-issue-991-992"
        ],
        "notes": "Anthropic lists Microsoft Foundry availability for Claude Fable 5 beginning June 9, 2026."
      }
    ],
    "releaseDateNotes": "Anthropic documents Claude Fable 5 as generally available on the Claude API,\nClaude Platform on AWS, Amazon Bedrock, Vertex AI, and Microsoft Foundry\nbeginning 2026-06-09.\n",
    "accessNotes": "Claude Fable 5 includes safety classifiers that can return\nstop_reason: \"refusal\" as a successful Messages API response.\n"
  },
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