Noometry

Model comparison

Gemini 3.1 Pro Preview vs GPT-5.1

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 48.8 on the Noometry Index.

Last verified . 49 shared benchmarks.

Gemini 3.1 Pro Preview Google

56.7

Rank #20 Confirmed

GPT-5.1 OpenAI

48.8

Rank #47 Confirmed

Summary

  • They share 49 benchmarks with published results for both. Gemini 3.1 Pro Preview scores higher in 6 categories and GPT-5.1 in 4 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 39.9.
  • The biggest single-benchmark swing is ARC-AGI-2: 77.1% for Gemini 3.1 Pro Preview and 17.6% for GPT-5.1.
  • GPT-5.1 is cheaper at $1.25 / $10 per million input/output tokens, against $2 / $12 for Gemini 3.1 Pro Preview.
  • Gemini 3.1 Pro Preview accepts more context: 1.05M tokens versus 400K.

Side by side

Gemini 3.1 Pro PreviewGPT-5.1
ProviderGoogleOpenAI
Noometry Index56.748.8
Released2026-02-192025-11-13
WeightsProprietaryProprietary
Context window1.05M400K
Max output66K128K
Input $ / M tokens$2$1.25
Output $ / M tokens$12$10
Results tracked7163

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Category by category

Coding GPT-5.1 leads

Gemini 3.1 Pro Preview: 42.7 (#88), GPT-5.1: 46.9 (#59)

BenchmarkGemini 3.1 Pro PreviewGPT-5.1
SWE-bench Verified75.6%68%
LMArena WebDev14461395
SciCode58.9%43.3%
GSO22.6%13.7%
WeirdML72.1%60.8%
LMArena Coding14831454
ALE-Bench1,1611,192
DeepSWE11.7%—
SWE-bench Verified (bash only)—66%
LiveBench Coding—72.5%
MirrorCode8.9%—
AlgoTune2.02—

Agentic & Tool Use Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 37.7 (#33), GPT-5.1: 32.5 (#55)

BenchmarkGemini 3.1 Pro PreviewGPT-5.1
Terminal-Bench80.2%47.6%
DeepResearch Bench47.8%42.8%
LMArena Search12111199
Vending-Bench 23,7741,473
APEX-Agents35.3%—
τ²-bench Banking26%—
PostTrainBench22%—
BALROG57%—
ExploitBench26.1%—
GBAEval0.8%—
GDP.pdf17%—
METR Time Horizons77%—

Reasoning Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 71.7 (#9), GPT-5.1: 39.9 (#50)

BenchmarkGemini 3.1 Pro PreviewGPT-5.1
ARC-AGI-277.1%17.6%
SimpleBench79.6%53.2%
ARC-AGI-198%72.8%
CritPt17.7%4.9%
Chess Puzzles55%32%
EnigmaEval36.8%11.2%
LMArena Hard Prompts14841457
Mystery Game Puzzles34%19%
DTBench97.1%90.1%
LMCA53.8%43.9%
Epoch Capabilities Index154.92149.66
ForecastBench5958.1
NYT Connections (extended)97.4%—
Thematic Generalization79.4%—
EBR-Bench14.3%—
LiveBench Reasoning—95.8%
LiveBench Data Analysis—72.1%
LiveBench—78.8%

Math Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 61.8 (#28), GPT-5.1: 50.3 (#45)

BenchmarkGemini 3.1 Pro PreviewGPT-5.1
OTIS Mock AIME 2024-202595.6%88.6%
LMArena Math14851446
FrontierMath (Feb 2025 set)36.9%31%
FrontierMath Tier 4 (v1)16.7%12.5%
FrontierMath (Tiers 1-3)59.6%—
FrontierMath Tier 426.8%—
MathArena Final-Answer Competitions86.5%—
ProofBench26%—
Omni-MATH—46.4%
LiveBench Math—94.5%

Knowledge Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 71.8 (#3), GPT-5.1: 50.5 (#65)

BenchmarkGemini 3.1 Pro PreviewGPT-5.1
GPQA Diamond94.4%87.6%
Humanity's Last Exam46.4%23.7%
SimpleQA Verified73.5%48%
Vectara Hallucination Rate10.4%10.9%
LMArena Expert14841470
MMLU-Pro—57.9%
GPQA (HELM)—44.2%

Multimodal GPT-5.1 leads

Gemini 3.1 Pro Preview: 38.1 (#60), GPT-5.1: 44.0 (#17)

BenchmarkGemini 3.1 Pro PreviewGPT-5.1
LMArena Vision12961250
LMArena Document14441403
VPCT—58.7%
Blueprint-Bench 226.5%—
Furniture Assembly26.7%—

Multilingual Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 57.1 (#11), GPT-5.1: 54.0 (#51)

BenchmarkGemini 3.1 Pro PreviewGPT-5.1
LMArena Non-English14751431
LMArena Chinese15281495
LMArena French14881451
LMArena German14911439
LMArena Japanese14941453
LMArena Korean14581401
LMArena Russian14961435
LMArena Spanish14801430

Instruction Following GPT-5.1 leads

Gemini 3.1 Pro Preview: 77.1 (#31), GPT-5.1: 84.0 (#1)

BenchmarkGemini 3.1 Pro PreviewGPT-5.1
LMArena Instruction Following14651442
LiveBench Instruction Following—93.3%
IFEval—93.5%

Long Context Too close to call

Gemini 3.1 Pro Preview: 47.3 (#17), GPT-5.1: 47.6 (#14)

BenchmarkGemini 3.1 Pro PreviewGPT-5.1
CL-bench20.8%23.7%
CL-bench Life16.9%17.3%
LMArena Longer Query14821448

Writing & Preference Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 66.3 (#36), GPT-5.1: 64.7 (#53)

BenchmarkGemini 3.1 Pro PreviewGPT-5.1
LMArena Text14801443
LMArena Creative Writing14821427
LMArena Multi-Turn14861449
EQ-Bench Creative Writing1491—
WildBench—86.3%
EQ-Bench 41142—
LiveBench Language—80.2%

Frequently asked questions

Is Gemini 3.1 Pro Preview better than GPT-5.1?

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 48.8 on the Noometry Index.

Which is cheaper, Gemini 3.1 Pro Preview or GPT-5.1?

GPT-5.1 is cheaper. It lists at $1.25 per million input tokens and $10 per million output tokens; Gemini 3.1 Pro Preview lists at $2 and $12.

Is Gemini 3.1 Pro Preview or GPT-5.1 better for coding?

GPT-5.1 scores higher on coding benchmarks: 46.9 versus 42.7 in the Noometry coding category.

Which has the bigger context window?

Gemini 3.1 Pro Preview does, with 1.05M tokens against 400K.

How many benchmarks do Gemini 3.1 Pro Preview and GPT-5.1 share?

49 benchmarks have published results for both models. Gemini 3.1 Pro Preview has 71 scored results on Noometry and GPT-5.1 has 63.

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