Noometry

Model comparison

Gemini 3.1 Pro Preview vs Gemma 4 31B IT

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 43.5 on the Noometry Index. Gemma 4 31B IT costs 30× 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 . 33 shared benchmarks.

Gemini 3.1 Pro Preview Google

56.7

Rank #23 Confirmed

Gemma 4 31B IT Google

43.5

Rank #90 Confirmed

Summary

  • They share 33 benchmarks with published results for both. Gemini 3.1 Pro Preview scores higher in 8 categories and Gemma 4 31B IT in 1 category; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 27.2.
  • The biggest single-benchmark swing is SimpleQA Verified: 73.5% for Gemini 3.1 Pro Preview and 10.4% for Gemma 4 31B IT.
  • Gemma 4 31B IT is cheaper at $0.09 / $0.34 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 262K.
  • Gemma 4 31B IT has downloadable open weights; the other is API-only.

Side by side

Gemini 3.1 Pro PreviewGemma 4 31B IT
ProviderGoogleGoogle
Noometry Index56.743.5
Released2026-02-192026-04-02
WeightsProprietaryOpen
Context window1.05M262K
Max output66K33K
Input $ / M tokens$2$0.09
Output $ / M tokens$12$0.34
Results tracked7135

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Category by category

Coding Too close to call

Gemini 3.1 Pro Preview: 42.5 (#99), Gemma 4 31B IT: 42.3 (#108)

BenchmarkGemini 3.1 Pro PreviewGemma 4 31B IT
LMArena WebDev14471366
SciCode58.9%43.4%
WeirdML72.1%52.3%
LMArena Coding14841459
ALE-Bench1,161925.5
SWE-bench Verified75.6%—
DeepSWE11.7%—
GSO22.6%—
MirrorCode8.9%—
AlgoTune2.02—

Agentic & Tool Use Not comparable

Gemini 3.1 Pro Preview: 37.7 (#34), Gemma 4 31B IT: —

BenchmarkGemini 3.1 Pro PreviewGemma 4 31B IT
Terminal-Bench80.2%—
APEX-Agents35.3%—
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), Gemma 4 31B IT: 27.2 (#122)

BenchmarkGemini 3.1 Pro PreviewGemma 4 31B IT
NYT Connections (extended)97.4%70.6%
CritPt17.7%1.4%
Chess Puzzles55%5%
Thematic Generalization79.4%53%
LMArena Hard Prompts14851448
DTBench97.1%82.7%
LMCA53.8%39.3%
Epoch Capabilities Index154.77142.74
ARC-AGI-277.1%—
SimpleBench79.6%—
Kagi LLM Benchmark—63.5%
ARC-AGI-198%—
EnigmaEval36.8%—
EBR-Bench14.3%—
Mystery Game Puzzles34%—
Surface Evolver Bench—30.6%
ForecastBench59—

Math Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 62.1 (#34), Gemma 4 31B IT: 43.2 (#81)

BenchmarkGemini 3.1 Pro PreviewGemma 4 31B IT
OTIS Mock AIME 2024-202595.6%73.3%
LMArena Math14851465
FrontierMath (Tiers 1-3)59.6%—
FrontierMath Tier 426.8%—
MathArena Final-Answer Competitions86.5%—
ProofBench26%—
FrontierMath (Feb 2025 set)36.9%—
FrontierMath Tier 4 (v1)16.7%—

Knowledge Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 71.8 (#3), Gemma 4 31B IT: 37.9 (#151)

BenchmarkGemini 3.1 Pro PreviewGemma 4 31B IT
GPQA Diamond94.4%75.8%
SimpleQA Verified73.5%10.4%
Vectara Hallucination Rate10.4%7.4%
LMArena Expert14851465
Humanity's Last Exam46.4%—

Multimodal Gemma 4 31B IT leads

Gemini 3.1 Pro Preview: 37.9 (#69), Gemma 4 31B IT: 41.6 (#34)

BenchmarkGemini 3.1 Pro PreviewGemma 4 31B IT
LMArena Vision12961277
LMArena Document14441425
Blueprint-Bench 226.5%—
Furniture Assembly26.7%—

Multilingual Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 57.0 (#12), Gemma 4 31B IT: 53.8 (#57)

BenchmarkGemini 3.1 Pro PreviewGemma 4 31B IT
LMArena Non-English14771431
LMArena Chinese15291476
LMArena French14871435
LMArena Russian14981460
LMArena Spanish14791444
LMArena German1491—
LMArena Japanese1493—
LMArena Korean1455—

Instruction Following Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 77.0 (#32), Gemma 4 31B IT: 75.5 (#61)

BenchmarkGemini 3.1 Pro PreviewGemma 4 31B IT
LMArena Instruction Following14661433

Long Context Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 47.4 (#18), Gemma 4 31B IT: 44.2 (#71)

BenchmarkGemini 3.1 Pro PreviewGemma 4 31B IT
LMArena Longer Query14831446
CL-bench20.8%—
CL-bench Life16.9%—

Writing & Preference Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 66.1 (#37), Gemma 4 31B IT: 60.5 (#96)

BenchmarkGemini 3.1 Pro PreviewGemma 4 31B IT
LMArena Text14811443
LMArena Creative Writing14821415
EQ-Bench Creative Writing14911368
EQ-Bench 411421120
LMArena Multi-Turn14881452

Frequently asked questions

Is Gemini 3.1 Pro Preview better than Gemma 4 31B IT?

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 43.5 on the Noometry Index. Gemma 4 31B IT costs 30× 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 Gemma 4 31B IT?

Gemma 4 31B IT is cheaper. It lists at $0.09 per million input tokens and $0.34 per million output tokens; Gemini 3.1 Pro Preview lists at $2 and $12.

Is Gemini 3.1 Pro Preview or Gemma 4 31B IT better for coding?

They score almost the same on coding (42.5 vs 42.3); test both on your own repository before choosing.

Which has the bigger context window?

Gemini 3.1 Pro Preview does, with 1.05M tokens against 262K.

How many benchmarks do Gemini 3.1 Pro Preview and Gemma 4 31B IT share?

33 benchmarks have published results for both models. Gemini 3.1 Pro Preview has 71 scored results on Noometry and Gemma 4 31B IT has 35.

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