Noometry

Model comparison

Gemini 3.1 Flash Lite vs Gemini 3.1 Pro Preview

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 40.4 on the Noometry Index. Gemini 3.1 Flash Lite costs 8.0× 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 . 37 shared benchmarks.

Gemini 3.1 Flash Lite Google

40.4

Rank #141 Confirmed

Gemini 3.1 Pro Preview Google

56.7

Rank #20 Confirmed

Summary

  • They share 37 benchmarks with published results for both. Gemini 3.1 Flash Lite scores higher in 1 category and Gemini 3.1 Pro Preview in 9 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 22.3.
  • The biggest single-benchmark swing is NYT Connections (extended): 8.2% for Gemini 3.1 Flash Lite and 97.4% for Gemini 3.1 Pro Preview.
  • Gemini 3.1 Flash Lite is cheaper at $0.25 / $1.50 per million input/output tokens, against $2 / $12 for Gemini 3.1 Pro Preview.

Side by side

Gemini 3.1 Flash LiteGemini 3.1 Pro Preview
ProviderGoogleGoogle
Noometry Index40.456.7
Released2026-03-032026-02-19
WeightsProprietaryProprietary
Context window1.05M1.05M
Max output66K66K
Input $ / M tokens$0.25$2
Output $ / M tokens$1.50$12
Results tracked3871

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Category by category

Coding Gemini 3.1 Pro Preview leads

Gemini 3.1 Flash Lite: 37.5 (#179), Gemini 3.1 Pro Preview: 42.7 (#88)

BenchmarkGemini 3.1 Flash LiteGemini 3.1 Pro Preview
LMArena WebDev12561446
SciCode41.9%58.9%
WeirdML52.2%72.1%
LMArena Coding14001483
ALE-Bench797.731,161
SWE-bench Verified—75.6%
DeepSWE—11.7%
GSO—22.6%
MirrorCode—8.9%
AlgoTune—2.02

Agentic & Tool Use Gemini 3.1 Pro Preview leads

Gemini 3.1 Flash Lite: 29.9 (#72), Gemini 3.1 Pro Preview: 37.7 (#33)

BenchmarkGemini 3.1 Flash LiteGemini 3.1 Pro Preview
DeepResearch Bench37.3%47.8%
Terminal-Bench—80.2%
APEX-Agents—35.3%
τ²-bench Banking—26%
PostTrainBench—22%
BALROG—57%
ExploitBench—26.1%
GBAEval—0.8%
GDP.pdf—17%
LMArena Search—1211
METR Time Horizons—77%
Vending-Bench 2—3,774

Reasoning Gemini 3.1 Pro Preview leads

Gemini 3.1 Flash Lite: 22.3 (#181), Gemini 3.1 Pro Preview: 71.7 (#9)

BenchmarkGemini 3.1 Flash LiteGemini 3.1 Pro Preview
NYT Connections (extended)8.2%97.4%
CritPt1.1%17.7%
Chess Puzzles25%55%
EnigmaEval3%36.8%
Thematic Generalization63.3%79.4%
LMArena Hard Prompts14071484
DTBench76.8%97.1%
LMCA35%53.8%
Epoch Capabilities Index144.45154.92
ForecastBench54.459
ARC-AGI-2—77.1%
SimpleBench—79.6%
Kagi LLM Benchmark67.2%—
ARC-AGI-1—98%
EBR-Bench—14.3%
Mystery Game Puzzles—34%

Math Gemini 3.1 Pro Preview leads

Gemini 3.1 Flash Lite: 39.5 (#82), Gemini 3.1 Pro Preview: 61.8 (#28)

BenchmarkGemini 3.1 Flash LiteGemini 3.1 Pro Preview
FrontierMath (Tiers 1-3)27.7%59.6%
OTIS Mock AIME 2024-202580%95.6%
LMArena Math14271485
FrontierMath Tier 4—26.8%
MathArena Final-Answer Competitions—86.5%
ProofBench—26%
FrontierMath (Feb 2025 set)—36.9%
FrontierMath Tier 4 (v1)—16.7%

Knowledge Gemini 3.1 Pro Preview leads

Gemini 3.1 Flash Lite: 41.7 (#95), Gemini 3.1 Pro Preview: 71.8 (#3)

BenchmarkGemini 3.1 Flash LiteGemini 3.1 Pro Preview
GPQA Diamond81.8%94.4%
Humanity's Last Exam8.6%46.4%
Vectara Hallucination Rate8.2%10.4%
LMArena Expert13971484
SimpleQA Verified—73.5%

Multimodal Too close to call

Gemini 3.1 Flash Lite: 38.7 (#57), Gemini 3.1 Pro Preview: 38.1 (#60)

BenchmarkGemini 3.1 Flash LiteGemini 3.1 Pro Preview
LMArena Vision12401296
Blueprint-Bench 2—26.5%
Furniture Assembly—26.7%
LMArena Document—1444

Multilingual Gemini 3.1 Pro Preview leads

Gemini 3.1 Flash Lite: 52.5 (#82), Gemini 3.1 Pro Preview: 57.1 (#11)

BenchmarkGemini 3.1 Flash LiteGemini 3.1 Pro Preview
LMArena Non-English14101475
LMArena Chinese14611528
LMArena French14231488
LMArena German14291491
LMArena Japanese14111494
LMArena Korean13931458
LMArena Russian14201496
LMArena Spanish14201480

Instruction Following Gemini 3.1 Pro Preview leads

Gemini 3.1 Flash Lite: 72.9 (#126), Gemini 3.1 Pro Preview: 77.1 (#31)

BenchmarkGemini 3.1 Flash LiteGemini 3.1 Pro Preview
LMArena Instruction Following13761465

Long Context Gemini 3.1 Pro Preview leads

Gemini 3.1 Flash Lite: 42.5 (#117), Gemini 3.1 Pro Preview: 47.3 (#17)

BenchmarkGemini 3.1 Flash LiteGemini 3.1 Pro Preview
LMArena Longer Query13941482
CL-bench—20.8%
CL-bench Life—16.9%

Writing & Preference Gemini 3.1 Pro Preview leads

Gemini 3.1 Flash Lite: 61.0 (#90), Gemini 3.1 Pro Preview: 66.3 (#36)

BenchmarkGemini 3.1 Flash LiteGemini 3.1 Pro Preview
LMArena Text14161480
LMArena Creative Writing14011482
LMArena Multi-Turn14171486
EQ-Bench Creative Writing—1491
EQ-Bench 4—1142

Frequently asked questions

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

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 40.4 on the Noometry Index. Gemini 3.1 Flash Lite costs 8.0× 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 Flash Lite or Gemini 3.1 Pro Preview?

Gemini 3.1 Flash Lite is cheaper. It lists at $0.25 per million input tokens and $1.50 per million output tokens; Gemini 3.1 Pro Preview lists at $2 and $12.

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

Gemini 3.1 Pro Preview scores higher on coding benchmarks: 42.7 versus 37.5 in the Noometry coding category.

Which has the bigger context window?

Both accept 1.05M tokens.

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

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

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