2026-10-20UPDATEPlatform updated: 52 models tracked across 42 independent benchmarks including CorpFin • 2026-10-20BENCHCorpFin added to benchmark suite — long credit agreement comprehension evaluations live • 2026-10-19MODELClaude Sonnet 5.5 and Opus 5.5 achieve 75.9% and 75.8% on Excel Modeling Benchmark v1.1 • 2026-10-19MODELTax Agent Bench updated: Claude Fable 5.1 (49.2%) and Gemini 4 Argon (44.6%) lead corporate tax research • 2026-10-18MODELGemini 4 Argon claims #1 rank on Finance Agent (v2) with 65.4% • 2026-10-13MODELGoogle launches Gemini 4 Argon with 1M-token output limit and native multimodal reasoning • 2026-10-06MODELAnthropic completes Claude 5.5 generation with Claude Haiku 5.5, Opus 5.5, and Sonnet 5.5 • 2026-10-20UPDATEPlatform updated: 52 models tracked across 42 independent benchmarks including CorpFin • 2026-10-20BENCHCorpFin added to benchmark suite — long credit agreement comprehension evaluations live • 2026-10-19MODELClaude Sonnet 5.5 and Opus 5.5 achieve 75.9% and 75.8% on Excel Modeling Benchmark v1.1 • 2026-10-19MODELTax Agent Bench updated: Claude Fable 5.1 (49.2%) and Gemini 4 Argon (44.6%) lead corporate tax research • 2026-10-18MODELGemini 4 Argon claims #1 rank on Finance Agent (v2) with 65.4% • 2026-10-13MODELGoogle launches Gemini 4 Argon with 1M-token output limit and native multimodal reasoning • 2026-10-06MODELAnthropic completes Claude 5.5 generation with Claude Haiku 5.5, Opus 5.5, and Sonnet 5.5 •
Home/Models/Claude Fable 5
Anthropic logoAnthropic

Claude Fable 5

Proprietary#5 on FB Leaderboard1M contextReleased 2026-06-0925 benchmarks evaluated
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69.8
FB Score
#5
Overall rank
FB Score69.8Rank #5
Best benchmark95.0%ProofBench
PAVE overall—%Level 1-4
Benchmarks25 / 42Evaluated
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Score by domain

Verification
77.6%
Rank #2 of 33
Document QA
77.9%
Rank #4 of 45
Numerical
82.3%
Rank #2 of 32
Forensic
61.0%
Rank #14 of 45
Multi-domain
Not evaluated
No data
Agent Tasks
57.9%
Rank #4 of 44
Performance profile
80%Verification77.6%Document QA77.9%Numerical82.3%Forensic61.0%Agent Tasks57.9%
Benchmark results25 evaluated · 17 pending
BenchmarkScoreRankTierWeightSourceDate
Pave Interchange Fee Benchmark
VerificationForensic
——Tier 130FB 2026Pending
FinanceBench
Document QA
——Tier 220FB 2026Pending
FinBen
Multi-domain
——Tier 310FB 2026Pending
FinQA
Numerical
——Tier 220FB 2026Pending
ConvFinQA
Document QA
——Tier 220FB 2026Pending
Finance Agent Benchmark
Agent Tasks
56.3#14 / 44Tier 130FB 20262026-09
MultiHiertt
Numerical
——Tier 310FB 2026Pending
FinAuditing
ForensicCompliance
——Tier 310FB 2026Pending
VALS Index
VerificationNumericalAgent Tasks
66.0#2 / 22Tier 125FB 20262026-06
MortgageTax Benchmark
NumericalForensic
68.9#6 / 22Tier 220FB 20262026-09
TaxEval v2
VerificationForensic
76.9#3 / 24Tier 220FB 20262026-09
Code Migration
Agent Tasks
55.1#2 / 23Tier 310FB 20262026-06
CyberBench
Forensic
——Tier 310FB 2026Pending
Excel Modeling Benchmark
Document QAForensic
73.7#5 / 44Tier 310FB 20262026-09
Legal Research Bench
Document QAForensic
49.5#2 / 22Tier 310FB 20262026-06
MedCode
Verification
56.1#2 / 20Tier 310FB 20262026-06
MedScribe
Document QA
88.5#4 / 20Tier 310FB 20262026-06
ProofBench v1.1
NumericalVerification
95.0#2 / 13Tier 310FB 20262026-06
SAGE
Agent Tasks
51.9#3 / 17Tier 310FB 20262026-06
Public Benefits Bench
VerificationForensic
70.4#2 / 16Tier 310FB 20262026-06
Vibe Code Bench v1.1
Agent Tasks
90.3#1 / 23Tier 310FB 20262026-06
Harvey's Legal Agent
Agent TasksForensic
11.3#5 / 22Tier 310FB 20262026-06
GPQA Diamond
NumericalVerification
93.2#6 / 20Tier 215FB 20262026-06
IOI
Numerical
72.3#5 / 8Tier 310FB 20262026-06
LiveCodeBench
Agent Tasks
89.8#1 / 19Tier 310FB 20262026-06
LegalBench
Document QAForensic
88.6#1 / 21Tier 310FB 20262026-06
MMLU Pro
NumericalVerification
91.5#2 / 21Tier 215FB 20262026-06
MMMU
Document QANumerical
89.3#2 / 14Tier 310FB 20262026-06
ProgramBench
Agent Tasks
2.0#2 / 17Tier 310FB 20262026-06
SkillsBench
Agent Tasks
——Tier 310FB 2026Pending
SWE-bench
Agent Tasks
95.0#5 / 22Tier 220FB 20262026-06
Terminal-Bench 2.1
Agent Tasks
80.5#4 / 23Tier 310FB 20262026-06
RSI Index
Agent TasksNumerical
——Tier 310FB 2026Pending
Time Horizon Index
ForensicAgent Tasks
——Tier 310FB 2026Pending
ReverseEngBench
Forensic
——Tier 310FB 2026Pending
Tax Agent Bench
ForensicAgent Tasks
38.3#21 / 25Tier 310FB 20262026-10
Big Finance Bench
ForensicDocument QA
——Tier 310FB 2026Pending
GDPval-MM
Document QANumerical
——Tier 310FB 2026Pending
BankerToolBench
Agent Tasks
——Tier 310FB 2026Pending
GDPval-Rubrics
Forensic
——Tier 310FB 2026Pending
PRBench-Finance
NumericalForensic
——Tier 310FB 2026Pending
CorpFin
ForensicVerification
71.8#2 / 13Tier 220FB 20262026-08
Contents.md
Model info
OrganisationAnthropic
Release date2026-06-09
LicenseProprietary
Context window1M tokens
Open weightNo
FB Score breakdown
Finance Agent×30 = 16.9
VALS Index×25 = 16.5
MortgageTax×20 = 13.8
TaxEval v2×20 = 15.4
Code Migration×10 = 5.5
EMB×10 = 7.4
Legal Research×10 = 5.0
MedCode×10 = 5.6
MedScribe×10 = 8.9
ProofBench×10 = 9.5
SAGE×10 = 5.2
Public Benefits×10 = 7.0
Vibe Code Bench×10 = 9.0
Harvey Legal×10 = 1.1
GPQA Diamond×15 = 14.0
IOI×10 = 7.2
LiveCodeBench×10 = 9.0
LegalBench×10 = 8.9
MMLU Pro×15 = 13.7
MMMU×10 = 8.9
ProgramBench×10 = 0.2
SWE-bench×20 = 19.0
Terminal-Bench×10 = 8.1
Tax Agent×10 = 3.8
CorpFin×20 = 14.4
FB Score (weighted avg)69.8
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Compare vs Claude Opus 4.7 in full →
Evaluation notes
Scores reflect median of 3 runs per task at temperature 0.0 with 0-shot prompting. PAVE evaluation conducted by FinanceBenchmark. Other scores sourced from latest published arXiv papers.