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 5.1
Anthropic logoAnthropic

Claude Fable 5.1

Proprietary#8 on FB Leaderboard1M contextReleased 2026-09-015 benchmarks evaluated
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66.2
FB Score
#8
Overall rank
FB Score66.2Rank #8
Best benchmark76.7%EMB
PAVE overall—%Level 1-4
Benchmarks5 / 42Evaluated
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Score by domain

Verification
76.0%
Rank #3 of 33
Document QA
76.7%
Rank #6 of 45
Numerical
70.8%
Rank #22 of 32
Forensic
68.2%
Rank #5 of 45
Multi-domain
Not evaluated
No data
Agent Tasks
54.0%
Rank #12 of 44
Performance profile
80%Verification76.0%Document QA76.7%Numerical70.8%Forensic68.2%Agent Tasks54.0%
Benchmark results5 evaluated · 37 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
58.9#7 / 44Tier 130FB 20262026-10
MultiHiertt
Numerical
——Tier 310FB 2026Pending
FinAuditing
ForensicCompliance
——Tier 310FB 2026Pending
VALS Index
VerificationNumericalAgent Tasks
——Tier 125FB 2026Pending
MortgageTax Benchmark
NumericalForensic
70.8#2 / 22Tier 220FB 20262026-09
TaxEval v2
VerificationForensic
76.0#6 / 24Tier 220FB 20262026-09
Code Migration
Agent Tasks
——Tier 310FB 2026Pending
CyberBench
Forensic
——Tier 310FB 2026Pending
Excel Modeling Benchmark
Document QAForensic
76.7#1 / 44Tier 310FB 20262026-10
Legal Research Bench
Document QAForensic
——Tier 310FB 2026Pending
MedCode
Verification
——Tier 310FB 2026Pending
MedScribe
Document QA
——Tier 310FB 2026Pending
ProofBench v1.1
NumericalVerification
——Tier 310FB 2026Pending
SAGE
Agent Tasks
——Tier 310FB 2026Pending
Public Benefits Bench
VerificationForensic
——Tier 310FB 2026Pending
Vibe Code Bench v1.1
Agent Tasks
——Tier 310FB 2026Pending
Harvey's Legal Agent
Agent TasksForensic
——Tier 310FB 2026Pending
GPQA Diamond
NumericalVerification
——Tier 215FB 2026Pending
IOI
Numerical
——Tier 310FB 2026Pending
LiveCodeBench
Agent Tasks
——Tier 310FB 2026Pending
LegalBench
Document QAForensic
——Tier 310FB 2026Pending
MMLU Pro
NumericalVerification
——Tier 215FB 2026Pending
MMMU
Document QANumerical
——Tier 310FB 2026Pending
ProgramBench
Agent Tasks
——Tier 310FB 2026Pending
SkillsBench
Agent Tasks
——Tier 310FB 2026Pending
SWE-bench
Agent Tasks
——Tier 220FB 2026Pending
Terminal-Bench 2.1
Agent Tasks
——Tier 310FB 2026Pending
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
49.2#12 / 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
——Tier 220FB 2026Pending
Contents.md
Model info
OrganisationAnthropic
Release date2026-09-01
LicenseProprietary
Context window1M tokens
Open weightNo
FB Score breakdown
Finance Agent×30 = 17.7
MortgageTax×20 = 14.2
TaxEval v2×20 = 15.2
EMB×10 = 7.7
Tax Agent×10 = 4.9
FB Score (weighted avg)66.2
Compare - all models
AClaude Opus 4.773.8%
OGPT-5.572.2%
OGPT-6 Sol71.1%
DDeepSeek V4 Pro70.1%
GGemini 3.1 Pro70.0%
OGPT-6 Luna70.0%
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.