Noometry

Model comparison

Claude 2.1 vs GPT-5.1

GPT-5.1 is the stronger model overall, scoring 49.0 to 25.2 on the Noometry Index.

Last verified . 6 shared benchmarks.

Claude 2.1 Anthropic

25.2

Rank #345 Reported

GPT-5.1 OpenAI

49.0

Rank #53 Confirmed

Summary

  • They share 6 benchmarks with published results for both. Claude 2.1 scores higher in 0 categories and GPT-5.1 in 4 categories; 4 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-5.1 leads 52.2 to 10.2.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 1.9% for Claude 2.1 and 88.6% for GPT-5.1.

Side by side

Claude 2.1GPT-5.1
ProviderAnthropicOpenAI
Noometry Index25.249.0
Released2023-11-212025-11-13
WeightsProprietaryProprietary
Context window—400K
Max output—128K
Input $ / M tokens—$1.25
Output $ / M tokens—$10
Results tracked763

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Category by category

Coding GPT-5.1 leads

Claude 2.1: 26.2 (#327), GPT-5.1: 46.4 (#66)

BenchmarkClaude 2.1GPT-5.1
WeirdML7.1%60.8%
SWE-bench Verified—68%
SWE-bench Verified (bash only)—66%
LMArena WebDev—1395
SciCode—43.3%
GSO—13.7%
LiveBench Coding—72.5%
LMArena Coding—1454
ALE-Bench—1,192

Agentic & Tool Use Not comparable

Claude 2.1: —, GPT-5.1: 32.7 (#60)

BenchmarkClaude 2.1GPT-5.1
Terminal-Bench—47.6%
DeepResearch Bench—42.8%
LMArena Search—1199
Vending-Bench 2—1,473

Reasoning GPT-5.1 leads

Claude 2.1: 21.4 (#221), GPT-5.1: 39.8 (#58)

BenchmarkClaude 2.1GPT-5.1
DTBench51%90.1%
Epoch Capabilities Index119.27149.64
ForecastBench54.258.1
ARC-AGI-2—17.6%
SimpleBench—53.2%
ARC-AGI-1—72.8%
CritPt—4.9%
Chess Puzzles—32%
EnigmaEval—11.2%
LiveBench Reasoning—95.8%
LMArena Hard Prompts—1457
Mystery Game Puzzles—19%
LiveBench Data Analysis—72.1%
LMCA—43.9%
LiveBench—78.8%

Math GPT-5.1 leads

Claude 2.1: 10.2 (#315), GPT-5.1: 52.2 (#51)

BenchmarkClaude 2.1GPT-5.1
OTIS Mock AIME 2024-20251.9%88.6%
Omni-MATH—46.4%
LiveBench Math—94.5%
LMArena Math—1447
FrontierMath (Feb 2025 set)—31%
FrontierMath Tier 4 (v1)—12.5%

Knowledge GPT-5.1 leads

Claude 2.1: 15.4 (#292), GPT-5.1: 50.6 (#71)

BenchmarkClaude 2.1GPT-5.1
GPQA Diamond33%87.6%
Humanity's Last Exam—23.7%
SimpleQA Verified—48%
MMLU-Pro—57.9%
Vectara Hallucination Rate—10.9%
GPQA (HELM)—44.2%
LMArena Expert—1470
MMLU73.5%—

Multimodal Not comparable

Claude 2.1: —, GPT-5.1: 44.8 (#19)

BenchmarkClaude 2.1GPT-5.1
LMArena Vision—1250
VPCT—58.7%
LMArena Document—1403

Multilingual Not comparable

Claude 2.1: —, GPT-5.1: 53.8 (#56)

BenchmarkClaude 2.1GPT-5.1
LMArena Non-English—1431
LMArena Chinese—1495
LMArena French—1450
LMArena German—1438
LMArena Japanese—1453
LMArena Korean—1401
LMArena Russian—1435
LMArena Spanish—1433

Instruction Following Not comparable

Claude 2.1: —, GPT-5.1: 83.9 (#1)

BenchmarkClaude 2.1GPT-5.1
LiveBench Instruction Following—93.3%
IFEval—93.5%
LMArena Instruction Following—1443

Long Context Not comparable

Claude 2.1: —, GPT-5.1: 47.6 (#14)

BenchmarkClaude 2.1GPT-5.1
CL-bench—23.7%
CL-bench Life—17.3%
LMArena Longer Query—1447

Writing & Preference Not comparable

Claude 2.1: —, GPT-5.1: 64.5 (#55)

BenchmarkClaude 2.1GPT-5.1
LMArena Text—1443
LMArena Creative Writing—1427
WildBench—86.3%
LMArena Multi-Turn—1450
LiveBench Language—80.2%

Frequently asked questions

Is Claude 2.1 better than GPT-5.1?

GPT-5.1 is the stronger model overall, scoring 49.0 to 25.2 on the Noometry Index.

Is Claude 2.1 or GPT-5.1 better for coding?

GPT-5.1 scores higher on coding benchmarks: 46.4 versus 26.2 in the Noometry coding category.

How many benchmarks do Claude 2.1 and GPT-5.1 share?

6 benchmarks have published results for both models. Claude 2.1 has 7 scored results on Noometry and GPT-5.1 has 63.

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