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/GPT-5.6 Terra
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GPT-5.6 Terra

Proprietary#21 on FB Leaderboard1M contextReleased 2026-07-0925 benchmarks evaluated
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63.1
FB Score
#21
Overall rank
FB Score63.1Rank #21
Best benchmark90.9%GPQA Diamond
PAVE overall—%Level 1-4
Benchmarks25 / 42Evaluated
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Score by domain

Verification
69.6%
Rank #13 of 33
Document QA
72.3%
Rank #19 of 45
Numerical
74.9%
Rank #15 of 32
Forensic
58.0%
Rank #23 of 45
Multi-domain
Not evaluated
No data
Agent Tasks
52.0%
Rank #18 of 44
Performance profile
80%Verification69.6%Document QA72.3%Numerical74.9%Forensic58.0%Agent Tasks52.0%
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
54.4#18 / 44Tier 130FB 20262026-09
MultiHiertt
Numerical
——Tier 310FB 2026Pending
FinAuditing
ForensicCompliance
——Tier 310FB 2026Pending
VALS Index
VerificationNumericalAgent Tasks
56.5#9 / 22Tier 125FB 20262026-07
MortgageTax Benchmark
NumericalForensic
67.3#11 / 22Tier 220FB 20262026-07
TaxEval v2
VerificationForensic
76.2#4 / 24Tier 220FB 20262026-09
Code Migration
Agent Tasks
36.5#11 / 23Tier 310FB 20262026-07
CyberBench
Forensic
——Tier 310FB 2026Pending
Excel Modeling Benchmark
Document QAForensic
66.2#19 / 44Tier 310FB 20262026-09
Legal Research Bench
Document QAForensic
40.9#9 / 22Tier 310FB 20262026-07
MedCode
Verification
43.4#10 / 20Tier 310FB 20262026-07
MedScribe
Document QA
82.9#14 / 20Tier 310FB 20262026-07
ProofBench v1.1
NumericalVerification
71.0#6 / 13Tier 310FB 20262026-07
SAGE
Agent Tasks
47.0#10 / 17Tier 310FB 20262026-07
Public Benefits Bench
VerificationForensic
62.4#9 / 16Tier 310FB 20262026-07
Vibe Code Bench v1.1
Agent Tasks
67.8#13 / 23Tier 310FB 20262026-07
Harvey's Legal Agent
Agent TasksForensic
0.4#19 / 22Tier 310FB 20262026-07
GPQA Diamond
NumericalVerification
90.9#12 / 20Tier 215FB 20262026-07
IOI
Numerical
65.3#6 / 8Tier 310FB 20262026-07
LiveCodeBench
Agent Tasks
85.9#10 / 19Tier 310FB 20262026-07
LegalBench
Document QAForensic
85.1#9 / 21Tier 310FB 20262026-07
MMLU Pro
NumericalVerification
86.7#14 / 21Tier 215FB 20262026-07
MMMU
Document QANumerical
86.5#8 / 14Tier 310FB 20262026-07
ProgramBench
Agent Tasks
0.5#5 / 17Tier 310FB 20262026-07
SkillsBench
Agent Tasks
60.6#2 / 17Tier 310FB 20262026-07
SWE-bench
Agent Tasks
75.2#18 / 22Tier 220FB 20262026-07
Terminal-Bench 2.1
Agent Tasks
73.4#8 / 23Tier 310FB 20262026-07
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
65.2#4 / 25Tier 310FB 20262026-09
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
OrganisationOpenAI
Release date2026-07-09
LicenseProprietary
Context window1M tokens
Open weightNo
FB Score breakdown
Finance Agent×30 = 16.3
VALS Index×25 = 14.1
MortgageTax×20 = 13.5
TaxEval v2×20 = 15.2
Code Migration×10 = 3.6
EMB×10 = 6.6
Legal Research×10 = 4.1
MedCode×10 = 4.3
MedScribe×10 = 8.3
ProofBench×10 = 7.1
SAGE×10 = 4.7
Public Benefits×10 = 6.2
Vibe Code Bench×10 = 6.8
Harvey Legal×10 = 0.0
GPQA Diamond×15 = 13.6
IOI×10 = 6.5
LiveCodeBench×10 = 8.6
LegalBench×10 = 8.5
MMLU Pro×15 = 13.0
MMMU×10 = 8.6
ProgramBench×10 = 0.1
SkillsBench×10 = 6.1
SWE-bench×20 = 15.0
Terminal-Bench×10 = 7.3
Tax Agent×10 = 6.5
FB Score (weighted avg)63.1
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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.