Noometry

Model comparison

Claude 2.1 vs GPT-5.1

GPT-5.1 is the stronger model overall, scoring 48.8 to 24.9 on the Noometry Index.

Last verified . 6 shared benchmarks.

Claude 2.1 Anthropic

24.9

Rank #340 Reported

GPT-5.1 OpenAI

48.8

Rank #47 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 50.3 to 9.6.
  • 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 Index24.948.8
Released2023-11-212025-11-13
WeightsProprietaryProprietary
Context window—400K
Max output—128K
Input $ / M tokens—$1.25
Output $ / M tokens—$10
Results tracked763

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding GPT-5.1 leads

Claude 2.1: 25.8 (#322), GPT-5.1: 46.9 (#59)

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: 32.5 (#55)

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: 20.6 (#216), GPT-5.1: 39.9 (#50)

BenchmarkClaude 2.1GPT-5.1
DTBench51%90.1%
Epoch Capabilities Index119.22149.66
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: 9.6 (#309), GPT-5.1: 50.3 (#45)

BenchmarkClaude 2.1GPT-5.1
OTIS Mock AIME 2024-20251.9%88.6%
Omni-MATH—46.4%
LiveBench Math—94.5%
LMArena Math—1446
FrontierMath (Feb 2025 set)—31%
FrontierMath Tier 4 (v1)—12.5%

Knowledge GPT-5.1 leads

Claude 2.1: 15.5 (#287), GPT-5.1: 50.5 (#65)

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: 44.0 (#17)

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

Multilingual Not comparable

Claude 2.1: —, GPT-5.1: 54.0 (#51)

BenchmarkClaude 2.1GPT-5.1
LMArena Non-English—1431
LMArena Chinese—1495
LMArena French—1451
LMArena German—1439
LMArena Japanese—1453
LMArena Korean—1401
LMArena Russian—1435
LMArena Spanish—1430

Instruction Following Not comparable

Claude 2.1: —, GPT-5.1: 84.0 (#1)

BenchmarkClaude 2.1GPT-5.1
LiveBench Instruction Following—93.3%
IFEval—93.5%
LMArena Instruction Following—1442

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—1448

Writing & Preference Not comparable

Claude 2.1: —, GPT-5.1: 64.7 (#53)

BenchmarkClaude 2.1GPT-5.1
LMArena Text—1443
LMArena Creative Writing—1427
WildBench—86.3%
LMArena Multi-Turn—1449
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 48.8 to 24.9 on the Noometry Index.

Is Claude 2.1 or GPT-5.1 better for coding?

GPT-5.1 scores higher on coding benchmarks: 46.9 versus 25.8 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.

Related comparisons

Go deeper