Noometry

Model comparison

Gemini 3.1 Pro Preview vs Gemini 3.5 Flash Lite

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 41.8 on the Noometry Index. Gemini 3.5 Flash Lite costs 5.3× 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 #20 Confirmed

Gemini 3.5 Flash Lite Google

41.8

Rank #113 Confirmed

Summary

  • They share 38 benchmarks with published results for both. Gemini 3.1 Pro Preview scores higher in 9 categories and Gemini 3.5 Flash Lite in 1 category; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 27.8.
  • The biggest single-benchmark swing is ARC-AGI-2: 77.1% for Gemini 3.1 Pro Preview and 10.3% for Gemini 3.5 Flash Lite.
  • Gemini 3.5 Flash Lite is cheaper at $0.30 / $2.50 per million input/output tokens, against $2 / $12 for Gemini 3.1 Pro Preview.

Side by side

Gemini 3.1 Pro PreviewGemini 3.5 Flash Lite
ProviderGoogleGoogle
Noometry Index56.741.8
Released2026-02-192026-07-21
WeightsProprietaryProprietary
Context window1.05M1.05M
Max output66K66K
Input $ / M tokens$2$0.30
Output $ / M tokens$12$2.50
Results tracked7138

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Category by category

Coding Too close to call

Gemini 3.1 Pro Preview: 42.7 (#88), Gemini 3.5 Flash Lite: 42.1 (#96)

BenchmarkGemini 3.1 Pro PreviewGemini 3.5 Flash Lite
LMArena WebDev14461440
SciCode58.9%41.3%
WeirdML72.1%39%
LMArena Coding14831455
ALE-Bench1,161765.27
SWE-bench Verified75.6%—
DeepSWE11.7%—
GSO22.6%—
MirrorCode8.9%—
AlgoTune2.02—

Agentic & Tool Use Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 37.7 (#33), Gemini 3.5 Flash Lite: 28.6 (#82)

BenchmarkGemini 3.1 Pro PreviewGemini 3.5 Flash Lite
GDP.pdf17%10%
Terminal-Bench80.2%—
APEX-Agents35.3%—
τ²-bench Banking26%—
DeepResearch Bench47.8%—
PostTrainBench22%—
BALROG57%—
ExploitBench26.1%—
GBAEval0.8%—
LMArena Search1211—
METR Time Horizons77%—
Vending-Bench 23,774—

Reasoning Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 71.7 (#9), Gemini 3.5 Flash Lite: 27.8 (#95)

BenchmarkGemini 3.1 Pro PreviewGemini 3.5 Flash Lite
ARC-AGI-277.1%10.3%
NYT Connections (extended)97.4%60.4%
ARC-AGI-198%53.5%
CritPt17.7%0%
Chess Puzzles55%22%
LMArena Hard Prompts14841441
Mystery Game Puzzles34%19%
DTBench97.1%83.5%
LMCA53.8%37.6%
Epoch Capabilities Index154.92145.12
SimpleBench79.6%—
EnigmaEval36.8%—
Thematic Generalization79.4%—
EBR-Bench14.3%—
ForecastBench59—

Math Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 61.8 (#28), Gemini 3.5 Flash Lite: 25.7 (#245)

BenchmarkGemini 3.1 Pro PreviewGemini 3.5 Flash Lite
FrontierMath (Tiers 1-3)59.6%26%
FrontierMath Tier 426.8%0%
OTIS Mock AIME 2024-202595.6%71.1%
ProofBench26%13%
LMArena Math14851431
MathArena Final-Answer Competitions86.5%—
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), Gemini 3.5 Flash Lite: 50.0 (#66)

BenchmarkGemini 3.1 Pro PreviewGemini 3.5 Flash Lite
GPQA Diamond94.4%83.3%
LMArena Expert14841430
Humanity's Last Exam46.4%—
SimpleQA Verified73.5%—
Vectara Hallucination Rate10.4%—

Multimodal Gemini 3.5 Flash Lite leads

Gemini 3.1 Pro Preview: 38.1 (#60), Gemini 3.5 Flash Lite: 40.3 (#38)

BenchmarkGemini 3.1 Pro PreviewGemini 3.5 Flash Lite
LMArena Vision12961266
Blueprint-Bench 226.5%—
Furniture Assembly26.7%—
LMArena Document1444—

Multilingual Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 57.1 (#11), Gemini 3.5 Flash Lite: 53.8 (#59)

BenchmarkGemini 3.1 Pro PreviewGemini 3.5 Flash Lite
LMArena Non-English14751428
LMArena Chinese15281467
LMArena French14881452
LMArena German14911454
LMArena Japanese14941428
LMArena Korean14581406
LMArena Russian14961443
LMArena Spanish14801440

Instruction Following Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 77.1 (#31), Gemini 3.5 Flash Lite: 75.0 (#77)

BenchmarkGemini 3.1 Pro PreviewGemini 3.5 Flash Lite
LMArena Instruction Following14651420

Long Context Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 47.3 (#17), Gemini 3.5 Flash Lite: 43.8 (#80)

BenchmarkGemini 3.1 Pro PreviewGemini 3.5 Flash Lite
LMArena Longer Query14821435
CL-bench20.8%—
CL-bench Life16.9%—

Writing & Preference Gemini 3.1 Pro Preview leads

Gemini 3.1 Pro Preview: 66.3 (#36), Gemini 3.5 Flash Lite: 64.4 (#55)

BenchmarkGemini 3.1 Pro PreviewGemini 3.5 Flash Lite
LMArena Text14801436
LMArena Creative Writing14821419
EQ-Bench Creative Writing14911559
LMArena Multi-Turn14861445
EQ-Bench 41142—

Frequently asked questions

Is Gemini 3.1 Pro Preview better than Gemini 3.5 Flash Lite?

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 41.8 on the Noometry Index. Gemini 3.5 Flash Lite costs 5.3× 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 Gemini 3.5 Flash Lite?

Gemini 3.5 Flash Lite is cheaper. It lists at $0.30 per million input tokens and $2.50 per million output tokens; Gemini 3.1 Pro Preview lists at $2 and $12.

Is Gemini 3.1 Pro Preview or Gemini 3.5 Flash Lite better for coding?

They score almost the same on coding (42.7 vs 42.1); test both on your own repository before choosing.

Which has the bigger context window?

Both accept 1.05M tokens.

How many benchmarks do Gemini 3.1 Pro Preview and Gemini 3.5 Flash Lite share?

38 benchmarks have published results for both models. Gemini 3.1 Pro Preview has 71 scored results on Noometry and Gemini 3.5 Flash Lite has 38.

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