Noometry

Model comparison

Gemini 3.1 Pro Preview vs GPT-5 Nano

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 33.5 on the Noometry Index. GPT-5 Nano costs 33× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

Last verified . 38 shared benchmarks.

Gemini 3.1 Pro Preview Google

56.7

Rank #23 Confirmed

GPT-5 Nano OpenAI

33.5

Rank #241 Confirmed

Summary

  • They share 38 benchmarks with published results for both. Gemini 3.1 Pro Preview scores higher in 10 categories and GPT-5 Nano in 0 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 16.3.
  • The biggest single-benchmark swing is ARC-AGI-1: 98% for Gemini 3.1 Pro Preview and 20.7% for GPT-5 Nano.
  • GPT-5 Nano is cheaper at $0.05 / $0.40 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 Nano
ProviderGoogleOpenAI
Noometry Index56.733.5
Released2026-02-192025-08-07
WeightsProprietaryProprietary
Context window1.05M400K
Max output66K128K
Input $ / M tokens$2$0.05
Output $ / M tokens$12$0.40
Results tracked7149

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Category by category

Coding Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 42.5 (#99), GPT-5 Nano: 33.6 (#254)

BenchmarkGemini 3.1 Pro PreviewGPT-5 Nano
WeirdML72.1%38.1%
LMArena Coding14841351
ALE-Bench1,161718.67
SWE-bench Verified75.6%—
DeepSWE11.7%—
SWE-bench Verified (bash only)—34.8%
LMArena WebDev1447—
SciCode58.9%—
GSO22.6%—
MirrorCode8.9%—
AlgoTune2.02—

Agentic & Tool Use Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 37.7 (#34), GPT-5 Nano: 25.8 (#106)

BenchmarkGemini 3.1 Pro PreviewGPT-5 Nano
Terminal-Bench80.2%21.8%
APEX-Agents35.3%—
Berkeley Function Calling Leaderboard—51.5%
τ²-bench Banking26%—
DeepResearch Bench47.8%—
PostTrainBench22%—
BALROG57%—
ExploitBench26.1%—
GBAEval0.8%—
GDP.pdf17%—
LMArena Search1211—
METR Time Horizons77%—
Vending-Bench 23,774—

Reasoning Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 71.7 (#12), GPT-5 Nano: 16.3 (#306)

BenchmarkGemini 3.1 Pro PreviewGPT-5 Nano
ARC-AGI-277.1%2.6%
ARC-AGI-198%20.7%
Chess Puzzles55%27%
LMArena Hard Prompts14851328
Mystery Game Puzzles34%9%
DTBench97.1%62.7%
LMCA53.8%7.9%
Epoch Capabilities Index154.77139.38
ForecastBench5959.1
SimpleBench79.6%—
Kagi LLM Benchmark—62.2%
NYT Connections (extended)97.4%—
CritPt17.7%—
EnigmaEval36.8%—
Thematic Generalization79.4%—
EBR-Bench14.3%—

Math Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 62.1 (#34), GPT-5 Nano: 29.4 (#241)

BenchmarkGemini 3.1 Pro PreviewGPT-5 Nano
FrontierMath (Tiers 1-3)59.6%20%
FrontierMath Tier 426.8%2.4%
OTIS Mock AIME 2024-202595.6%81.1%
ProofBench26%12%
LMArena Math14851317
FrontierMath (Feb 2025 set)36.9%8.3%
FrontierMath Tier 4 (v1)16.7%2.1%
MathArena Final-Answer Competitions86.5%—
Omni-MATH—54.6%
MATH Level 5—95.2%

Knowledge Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 71.8 (#3), GPT-5 Nano: 35.9 (#178)

BenchmarkGemini 3.1 Pro PreviewGPT-5 Nano
GPQA Diamond94.4%69.4%
SimpleQA Verified73.5%11.7%
Vectara Hallucination Rate10.4%10.5%
LMArena Expert14851321
Humanity's Last Exam46.4%—
MMLU-Pro—77.8%
GPQA (HELM)—67.9%

Multimodal Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 37.9 (#69), GPT-5 Nano: 31.3 (#108)

BenchmarkGemini 3.1 Pro PreviewGPT-5 Nano
LMArena Vision12961159
VPCT—37.2%
Blueprint-Bench 226.5%—
Furniture Assembly26.7%—
LMArena Document1444—

Multilingual Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 57.0 (#12), GPT-5 Nano: 45.3 (#172)

BenchmarkGemini 3.1 Pro PreviewGPT-5 Nano
LMArena Non-English14771313
LMArena Chinese15291356
LMArena German14911327
LMArena Japanese14931226
LMArena Korean14551269
LMArena Russian14981296
LMArena Spanish14791360
LMArena French1487—

Instruction Following Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 77.0 (#32), GPT-5 Nano: 75.0 (#79)

BenchmarkGemini 3.1 Pro PreviewGPT-5 Nano
LMArena Instruction Following14661306
IFEval—93.2%

Long Context Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 47.4 (#18), GPT-5 Nano: 31.3 (#281)

BenchmarkGemini 3.1 Pro PreviewGPT-5 Nano
LMArena Longer Query14831312
Fiction.LiveBench—44.4%
CL-bench20.8%—
CL-bench Life16.9%—

Writing & Preference Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 66.1 (#37), GPT-5 Nano: 39.1 (#249)

BenchmarkGemini 3.1 Pro PreviewGPT-5 Nano
LMArena Text14811320
LMArena Creative Writing14821249
EQ-Bench Creative Writing1491705
LMArena Multi-Turn14881311
WildBench—80.6%
EQ-Bench 41142—

Frequently asked questions

Is Gemini 3.1 Pro Preview better than GPT-5 Nano?

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 33.5 on the Noometry Index. GPT-5 Nano costs 33× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

Which is cheaper, Gemini 3.1 Pro Preview or GPT-5 Nano?

GPT-5 Nano is cheaper. It lists at $0.05 per million input tokens and $0.40 per million output tokens; Gemini 3.1 Pro Preview lists at $2 and $12.

Is Gemini 3.1 Pro Preview or GPT-5 Nano better for coding?

Gemini 3.1 Pro Preview scores higher on coding benchmarks: 42.5 versus 33.6 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 Nano share?

38 benchmarks have published results for both models. Gemini 3.1 Pro Preview has 71 scored results on Noometry and GPT-5 Nano has 49.

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