Noometry

Model comparison

Gemini 2.5 Pro vs Gemini 3.5 Flash Lite

Gemini 2.5 Pro is the stronger model overall, scoring 44.9 to 41.8 on the Noometry Index. Gemini 3.5 Flash Lite costs 4.0× less per token, which makes it the better buy when Gemini 2.5 Pro's lead doesn't matter for your workload.

Last verified . 34 shared benchmarks.

Gemini 2.5 Pro Google

44.9

Rank #67 Confirmed

Gemini 3.5 Flash Lite Google

41.8

Rank #113 Confirmed

Summary

  • They share 34 benchmarks with published results for both. Gemini 2.5 Pro scores higher in 9 categories and Gemini 3.5 Flash Lite in 1 category; 6 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Gemini 2.5 Pro leads 59.7 to 43.8.
  • The biggest single-benchmark swing is WeirdML: 54% for Gemini 2.5 Pro and 39% for Gemini 3.5 Flash Lite.
  • Gemini 3.5 Flash Lite is cheaper at $0.30 / $2.50 per million input/output tokens, against $1.25 / $10 for Gemini 2.5 Pro.

Side by side

Gemini 2.5 ProGemini 3.5 Flash Lite
ProviderGoogleGoogle
Noometry Index44.941.8
Released2025-03-252026-07-21
WeightsProprietaryProprietary
Context window1.05M1.05M
Max output66K66K
Input $ / M tokens$1.25$0.30
Output $ / M tokens$10$2.50
Results tracked7838

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Category by category

Coding Too close to call

Gemini 2.5 Pro: 42.8 (#86), Gemini 3.5 Flash Lite: 42.1 (#96)

BenchmarkGemini 2.5 ProGemini 3.5 Flash Lite
LMArena WebDev12271440
SciCode42.8%41.3%
WeirdML54%39%
LMArena Coding14521455
ALE-Bench785.52765.27
SWE-bench Verified57.6%—
SWE-bench Verified (bash only)53.6%—
Aider Polyglot83.1%—
GSO3.9%—
LiveBench Coding85.9%—
CadEval64%—
AlgoTune1.51—

Agentic & Tool Use Too close to call

Gemini 2.5 Pro: 29.1 (#81), Gemini 3.5 Flash Lite: 28.6 (#82)

BenchmarkGemini 2.5 ProGemini 3.5 Flash Lite
Terminal-Bench32.6%—
GDPval23.3%—
Remote Labor Index0.8%—
TheAgentCompany30.3%—
τ²-bench Banking13.7%—
DeepResearch Bench42.8%—
BALROG43.3%—
GDP.pdf—10%
LMArena Search1142—
METR Time Horizons55.4%—
Vending-Bench 2573.64—

Reasoning Gemini 2.5 Pro leads

Gemini 2.5 Pro: 28.8 (#85), Gemini 3.5 Flash Lite: 27.8 (#95)

BenchmarkGemini 2.5 ProGemini 3.5 Flash Lite
ARC-AGI-24.9%10.3%
ARC-AGI-141%53.5%
CritPt2%0%
Chess Puzzles20%22%
LMArena Hard Prompts14551441
DTBench82.4%83.5%
LMCA34.8%37.6%
Epoch Capabilities Index145.32145.12
SimpleBench62.4%—
Kagi LLM Benchmark70.3%—
NYT Connections (extended)—60.4%
EnigmaEval5.6%—
LiveBench Reasoning89.8%—
Mystery Game Puzzles—19%
LiveBench Data Analysis79.9%—
ForecastBench61.3—
LiveBench82.3%—

Math Gemini 2.5 Pro leads

Gemini 2.5 Pro: 31.9 (#191), Gemini 3.5 Flash Lite: 25.7 (#245)

BenchmarkGemini 2.5 ProGemini 3.5 Flash Lite
FrontierMath (Tiers 1-3)24.6%26%
FrontierMath Tier 40%0%
OTIS Mock AIME 2024-202584.7%71.1%
LMArena Math14501431
ProofBench—13%
Omni-MATH41.6%—
LiveBench Math90.2%—
MATH Level 595.9%—
FrontierMath (Feb 2025 set)14.1%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Gemini 2.5 Pro leads

Gemini 2.5 Pro: 55.8 (#41), Gemini 3.5 Flash Lite: 50.0 (#66)

BenchmarkGemini 2.5 ProGemini 3.5 Flash Lite
GPQA Diamond85.3%83.3%
LMArena Expert14521430
Humanity's Last Exam21.6%—
MMLU-Pro86.3%—
Confabulations10.6%—
Vectara Hallucination Rate7%—
GPQA (HELM)74.9%—

Multimodal Gemini 2.5 Pro leads

Gemini 2.5 Pro: 44.5 (#16), Gemini 3.5 Flash Lite: 40.3 (#38)

BenchmarkGemini 2.5 ProGemini 3.5 Flash Lite
LMArena Vision12631266
GeoBench86%—
VPCT48%—
LMArena Document1421—
SpatialViz-Bench44.7%—

Multilingual Gemini 2.5 Pro leads

Gemini 2.5 Pro: 55.5 (#30), Gemini 3.5 Flash Lite: 53.8 (#59)

BenchmarkGemini 2.5 ProGemini 3.5 Flash Lite
LMArena Non-English14521428
LMArena Chinese15071467
LMArena French14731452
LMArena German14871454
LMArena Japanese14621428
LMArena Korean14351406
LMArena Russian14601443
LMArena Spanish14731440

Instruction Following Too close to call

Gemini 2.5 Pro: 75.2 (#71), Gemini 3.5 Flash Lite: 75.0 (#77)

BenchmarkGemini 2.5 ProGemini 3.5 Flash Lite
LMArena Instruction Following14361420
LiveBench Instruction Following80.6%—
IFEval84%—

Long Context Gemini 2.5 Pro leads

Gemini 2.5 Pro: 59.7 (#5), Gemini 3.5 Flash Lite: 43.8 (#80)

BenchmarkGemini 2.5 ProGemini 3.5 Flash Lite
LMArena Longer Query14491435
Fiction.LiveBench91.7%—

Writing & Preference Too close to call

Gemini 2.5 Pro: 63.9 (#60), Gemini 3.5 Flash Lite: 64.4 (#55)

BenchmarkGemini 2.5 ProGemini 3.5 Flash Lite
LMArena Text14581436
LMArena Creative Writing14531419
EQ-Bench Creative Writing14211559
LMArena Multi-Turn14531445
Short-Story Creative Writing83.8%—
WildBench85.7%—
LiveBench Language67.8%—

Frequently asked questions

Is Gemini 2.5 Pro better than Gemini 3.5 Flash Lite?

Gemini 2.5 Pro is the stronger model overall, scoring 44.9 to 41.8 on the Noometry Index. Gemini 3.5 Flash Lite costs 4.0× less per token, which makes it the better buy when Gemini 2.5 Pro's lead doesn't matter for your workload.

Which is cheaper, Gemini 2.5 Pro 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 2.5 Pro lists at $1.25 and $10.

Is Gemini 2.5 Pro or Gemini 3.5 Flash Lite better for coding?

They score almost the same on coding (42.8 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 2.5 Pro and Gemini 3.5 Flash Lite share?

34 benchmarks have published results for both models. Gemini 2.5 Pro has 78 scored results on Noometry and Gemini 3.5 Flash Lite has 38.

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