Noometry

Model comparison

Gemini 3 Flash Preview vs GPT-5 Nano

Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 33.4 on the Noometry Index. GPT-5 Nano costs 8.2× less per token, which makes it the better buy when Gemini 3 Flash Preview's lead doesn't matter for your workload.

Last verified . 38 shared benchmarks.

Gemini 3 Flash Preview Google

52.3

Rank #33 Confirmed

GPT-5 Nano OpenAI

33.4

Rank #234 Confirmed

Summary

  • They share 38 benchmarks with published results for both. Gemini 3 Flash Preview scores higher in 10 categories and GPT-5 Nano in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3 Flash Preview leads 49.2 to 16.4.
  • The biggest single-benchmark swing is ARC-AGI-1: 84.7% for Gemini 3 Flash Preview and 20.7% for GPT-5 Nano.
  • GPT-5 Nano is cheaper at $0.05 / $0.40 per million input/output tokens, against $0.50 / $3 for Gemini 3 Flash Preview.
  • Gemini 3 Flash Preview accepts more context: 1.05M tokens versus 400K.

Side by side

Gemini 3 Flash PreviewGPT-5 Nano
ProviderGoogleOpenAI
Noometry Index52.333.4
Released2025-12-172025-08-07
WeightsProprietaryProprietary
Context window1.05M400K
Max output66K128K
Input $ / M tokens$0.50$0.05
Output $ / M tokens$3$0.40
Results tracked5948

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 51.5 (#35), GPT-5 Nano: 33.3 (#248)

BenchmarkGemini 3 Flash PreviewGPT-5 Nano
SWE-bench Verified (bash only)75.8%34.8%
WeirdML61.6%38.1%
LMArena Coding14601351
ALE-Bench1,367718.67
SWE-bench Verified75.4%—
LMArena WebDev1439—
SWE-bench Multilingual72.7%—
GSO9.8%—

Agentic & Tool Use Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 38.6 (#27), GPT-5 Nano: 25.6 (#99)

BenchmarkGemini 3 Flash PreviewGPT-5 Nano
Terminal-Bench64.3%21.8%
Berkeley Function Calling Leaderboard—51.5%
τ²-bench Airline82.5%—
τ²-bench Banking27.3%—
τ²-bench Retail76.8%—
τ²-bench Telecom91.2%—
DeepResearch Bench49.8%—
BALROG48.1%—
GDP.pdf10%—
LMArena Search1198—
Vending-Bench 23,635—

Reasoning Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 49.2 (#35), GPT-5 Nano: 16.4 (#291)

BenchmarkGemini 3 Flash PreviewGPT-5 Nano
ARC-AGI-233.6%2.6%
ARC-AGI-184.7%20.7%
Chess Puzzles40%27%
LMArena Hard Prompts14651329
Mystery Game Puzzles26%9%
DTBench89.1%62.7%
LMCA43.1%7.9%
Epoch Capabilities Index151.83139.39
ForecastBench58.559.1
SimpleBench61.1%—
Kagi LLM Benchmark—62.2%
NYT Connections (extended)83.1%—

Math Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 51.4 (#42), GPT-5 Nano: 29.1 (#221)

BenchmarkGemini 3 Flash PreviewGPT-5 Nano
FrontierMath (Tiers 1-3)51.2%20%
FrontierMath Tier 417.1%2.4%
OTIS Mock AIME 2024-202595.6%81.1%
ProofBench15%12%
LMArena Math14721318
FrontierMath (Feb 2025 set)35.6%8.3%
FrontierMath Tier 4 (v1)4.2%2.1%
MathArena Final-Answer Competitions67.6%—
Omni-MATH—54.6%
MATH Level 5—95.2%

Knowledge Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 58.8 (#30), GPT-5 Nano: 35.8 (#166)

BenchmarkGemini 3 Flash PreviewGPT-5 Nano
GPQA Diamond89.4%69.4%
SimpleQA Verified66.8%11.7%
Vectara Hallucination Rate13.5%10.5%
LMArena Expert14611321
MMLU-Pro—77.8%
GPQA (HELM)—67.9%

Multimodal Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 45.3 (#15), GPT-5 Nano: 30.7 (#102)

BenchmarkGemini 3 Flash PreviewGPT-5 Nano
LMArena Vision12851159
VPCT72.6%37.2%
GeoBench88%—
Blueprint-Bench 20%—
LMArena Document1413—

Multilingual Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 55.9 (#26), GPT-5 Nano: 45.5 (#167)

BenchmarkGemini 3 Flash PreviewGPT-5 Nano
LMArena Non-English14581313
LMArena Chinese15101355
LMArena German14971329
LMArena Korean14431269
LMArena Russian14801296
LMArena Spanish14701360
LMArena French1478—
LMArena Japanese1488—

Instruction Following Too close to call

Gemini 3 Flash Preview: 75.8 (#52), GPT-5 Nano: 75.2 (#72)

BenchmarkGemini 3 Flash PreviewGPT-5 Nano
LMArena Instruction Following14371306
IFEval—93.2%

Long Context Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 44.4 (#63), GPT-5 Nano: 31.3 (#275)

BenchmarkGemini 3 Flash PreviewGPT-5 Nano
LMArena Longer Query14521313
Fiction.LiveBench—44.4%

Writing & Preference Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 65.6 (#44), GPT-5 Nano: 39.4 (#244)

BenchmarkGemini 3 Flash PreviewGPT-5 Nano
LMArena Text14661320
LMArena Creative Writing14571250
LMArena Multi-Turn14711311
EQ-Bench Creative Writing—705
WildBench—80.6%

Frequently asked questions

Is Gemini 3 Flash Preview better than GPT-5 Nano?

Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 33.4 on the Noometry Index. GPT-5 Nano costs 8.2× less per token, which makes it the better buy when Gemini 3 Flash Preview's lead doesn't matter for your workload.

Which is cheaper, Gemini 3 Flash 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 Flash Preview lists at $0.50 and $3.

Is Gemini 3 Flash Preview or GPT-5 Nano better for coding?

Gemini 3 Flash Preview scores higher on coding benchmarks: 51.5 versus 33.3 in the Noometry coding category.

Which has the bigger context window?

Gemini 3 Flash Preview does, with 1.05M tokens against 400K.

How many benchmarks do Gemini 3 Flash Preview and GPT-5 Nano share?

38 benchmarks have published results for both models. Gemini 3 Flash Preview has 59 scored results on Noometry and GPT-5 Nano has 48.

Related comparisons

Go deeper