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421 changes: 167 additions & 254 deletions README.md

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90 changes: 59 additions & 31 deletions data/models/claude-fable-5.json
Original file line number Diff line number Diff line change
Expand Up @@ -3,12 +3,11 @@
"type": "model",
"name": "Claude Fable 5",
"provider": "Anthropic",
"version": "claude-fable-5",
"version": "20260609",
"last_evaluated": "2026-06-10",
"evaluated_by": "TrustVector Team",
"description": "Anthropic's new top-tier model above Opus and the first generally available Mythos-class model. State-of-the-art on nearly all tested benchmarks at launch, including the highest frontier score on Cognition's FrontierCode. Adaptive thinking only, 1M context, 128K output.",
"website": "https://www.anthropic.com/news/claude-fable-5-mythos-5",

"trust_vector": {
"performance_reliability": {
"overall_score": 98,
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},
"notes": "Current highest-performing model in the registry. SOTA on nearly all tested benchmarks at launch, including the top frontier score on Cognition's FrontierCode. Latency data is preliminary (released 2026-06-09)."
},

"security": {
"overall_score": 92,
"criteria": {
Expand Down Expand Up @@ -212,7 +210,6 @@
},
"notes": "Frontier-tier safety posture; the unrestricted Mythos-class research model (Claude Mythos 5) is limited to research partners while Fable 5 is the generally available variant. Independent red-team coverage still accumulating at launch."
},

"privacy_compliance": {
"overall_score": 93,
"criteria": {
Expand Down Expand Up @@ -303,7 +300,6 @@
},
"notes": "Same strong Anthropic compliance posture as the Opus line: SOC 2 Type II, GDPR, HIPAA-eligible, training opt-out by default for API traffic."
},

"trust_transparency": {
"overall_score": 88,
"criteria": {
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},
"notes": "Strong documentation and guardrails. Thinking content is omitted by default (summarized display is opt-in), which slightly reduces out-of-the-box reasoning visibility compared to older Opus defaults."
},

"operational_excellence": {
"overall_score": 91,
"criteria": {
Expand All @@ -426,7 +421,7 @@
],
"methodology": "Review of API design, consistency, and feature completeness",
"last_verified": "2026-06-10",
"notes": "One new breaking change vs Opus 4.8: explicit thinking disabled returns 400 omit the thinking parameter instead. No temperature/top_p sampling parameters."
"notes": "One new breaking change vs Opus 4.8: explicit thinking disabled returns 400 \u2014 omit the thinking parameter instead. No temperature/top_p sampling parameters."
},
"sdk_quality": {
"score": 93,
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"source": "Anthropic Launch Announcement",
"url": "https://www.anthropic.com/news/claude-fable-5-mythos-5",
"date": "2026-06-09",
"value": "Available on the Anthropic API at launch; first generally available Mythos-class model cloud-provider rollout following"
"value": "Available on the Anthropic API at launch; first generally available Mythos-class model \u2014 cloud-provider rollout following"
}
],
"methodology": "Analysis of third-party integrations and availability surfaces",
Expand All @@ -517,60 +512,88 @@
"notes": "Same API surface as Opus 4.7/4.8 makes adoption straightforward for existing Claude users. Day-old release means ecosystem and operational track record are still maturing."
}
},

"use_case_ratings": {
"code-generation": {
"overall": 98,
"notes": "Highest frontier score on Cognition's FrontierCode and SOTA on tested coding benchmarks at launch. Best-in-registry for the hardest software engineering work; xhigh effort recommended.",
"alternatives": ["claude-opus-4-8", "gpt-5-3-codex"]
"alternatives": [
"claude-opus-4-8",
"gpt-5-3-codex"
]
},
"customer-support": {
"overall": 88,
"notes": "Exceptional quality but premium pricing ($10/$50) and latency make it overkill for routine support; reserve for complex escalations.",
"alternatives": ["claude-sonnet-4-6", "claude-haiku-4-5"]
"alternatives": [
"claude-sonnet-4-6",
"claude-haiku-4-5"
]
},
"content-creation": {
"overall": 95,
"notes": "Top-tier long-form writing with strong structure and voice control. Effort parameter lets teams trade cost for polish on flagship pieces.",
"alternatives": ["claude-opus-4-8", "gpt-5-5"]
"alternatives": [
"claude-opus-4-8",
"gpt-5-5"
]
},
"data-analysis": {
"overall": 97,
"notes": "SOTA quantitative reasoning with 1M context for whole-dataset and multi-document analysis.",
"alternatives": ["claude-opus-4-8", "gemini-3-1-pro"]
"alternatives": [
"claude-opus-4-8",
"gemini-3-1-pro"
]
},
"research-assistant": {
"overall": 97,
"notes": "Best-in-registry deep research: 1M context, adaptive thinking, and strong synthesis across large corpora.",
"alternatives": ["claude-opus-4-8", "gemini-3-1-pro"]
"alternatives": [
"claude-opus-4-8",
"gemini-3-1-pro"
]
},
"legal-compliance": {
"overall": 93,
"notes": "Strong privacy posture (SOC 2 Type II, GDPR, HIPAA-eligible) and excellent long-document analysis; launch-recency may matter for conservative legal teams.",
"alternatives": ["claude-opus-4-8", "claude-sonnet-4-6"]
"alternatives": [
"claude-opus-4-8",
"claude-sonnet-4-6"
]
},
"healthcare": {
"overall": 91,
"notes": "HIPAA eligible with training opt-out by default. Highest accuracy in the registry for clinical reasoning, though real-world validation is still early post-launch.",
"alternatives": ["claude-opus-4-8", "claude-sonnet-4-6"]
"alternatives": [
"claude-opus-4-8",
"claude-sonnet-4-6"
]
},
"financial-analysis": {
"overall": 96,
"notes": "SOTA quantitative and multi-step reasoning; 1M context handles full filings and model workbooks in one pass.",
"alternatives": ["claude-opus-4-8", "gpt-5-5"]
"alternatives": [
"claude-opus-4-8",
"gpt-5-5"
]
},
"education": {
"overall": 94,
"notes": "Excellent explanations with effort-adjustable depth; premium pricing limits high-volume tutoring deployments.",
"alternatives": ["claude-sonnet-4-6", "gpt-5-5"]
"alternatives": [
"claude-sonnet-4-6",
"gpt-5-5"
]
},
"creative-writing": {
"overall": 93,
"notes": "Strong narrative craft and stylistic range. No temperature/top_p controls — variance must be elicited via prompting.",
"alternatives": ["claude-opus-4-8", "gpt-5-5"]
"notes": "Strong narrative craft and stylistic range. No temperature/top_p controls \u2014 variance must be elicited via prompting.",
"alternatives": [
"claude-opus-4-8",
"gpt-5-5"
]
}
},

"strengths": [
"State-of-the-art on nearly all tested benchmarks at launch; highest-performing model in the registry",
"Highest frontier score on Cognition's FrontierCode coding benchmark",
Expand All @@ -579,29 +602,25 @@
"Adaptive thinking with effort parameter (low/medium/high/xhigh/max) for cost/quality control",
"Strong compliance posture: SOC 2 Type II, GDPR, HIPAA-eligible, training opt-out by default for API"
],

"limitations": [
"Premium pricing at $10/$50 per 1M tokens (2x Opus 4.8)",
"Adaptive thinking only no manual thinking budgets, and no temperature/top_p sampling parameters",
"Adaptive thinking only \u2014 no manual thinking budgets, and no temperature/top_p sampling parameters",
"Explicit thinking-disabled requests return 400 (omit the thinking parameter instead)",
"Released 2026-06-09 independent benchmark replication and operational track record still limited",
"Released 2026-06-09 \u2014 independent benchmark replication and operational track record still limited",
"Higher latency than Sonnet/Haiku tiers, especially at xhigh/max effort"
],

"best_for": [
"Frontier-difficulty software engineering and long-horizon agentic coding",
"Deep research and analysis over very large corpora (1M context)",
"High-stakes reasoning where accuracy justifies premium cost",
"Enterprise workloads requiring strong compliance with top-tier capability"
],

"not_recommended_for": [
"Cost-sensitive high-volume inference (use Sonnet or Haiku tiers)",
"Real-time applications requiring sub-second latency",
"Workflows that depend on temperature/top_p sampling controls",
"Audio processing applications"
],

"metadata": {
"pricing": {
"input": "$10.00 per 1M tokens",
Expand All @@ -624,7 +643,12 @@
"Arabic",
"Hindi"
],
"modalities": ["text", "image (input)", "document", "computer-use"],
"modalities": [
"text",
"image (input)",
"document",
"computer-use"
],
"api_endpoint": "https://api.anthropic.com/v1/messages",
"api_model_id": "claude-fable-5",
"open_source": false,
Expand All @@ -633,9 +657,13 @@
"knowledge_cutoff": "Not disclosed",
"release_date": "2026-06-09"
},

"related_entities": ["claude-opus-4-8", "claude-opus-4-7", "claude-sonnet-4-6", "gpt-5-5", "gemini-3-1-pro"],

"related_entities": [
"claude-opus-4-8",
"claude-opus-4-7",
"claude-sonnet-4-6",
"gpt-5-5",
"gemini-3-1-pro"
],
"tags": [
"coding",
"reasoning",
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