Noometry

Model comparison

Gemini 3.5 Flash vs GPT-4o mini

Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 25.5 on the Noometry Index. GPT-4o mini costs 13× less per token, which makes it the better buy when Gemini 3.5 Flash's lead doesn't matter for your workload.

Last verified . 30 shared benchmarks.

Gemini 3.5 Flash Google

54.2

Rank #32 Confirmed

GPT-4o mini OpenAI

25.5

Rank #343 Confirmed

Summary

  • They share 30 benchmarks with published results for both. Gemini 3.5 Flash scores higher in 9 categories and GPT-4o mini in 1 category; 10 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.5 Flash leads 62.8 to 8.7.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 95.6% for Gemini 3.5 Flash and 6.9% for GPT-4o mini.
  • GPT-4o mini is cheaper at $0.15 / $0.60 per million input/output tokens, against $1.50 / $9 for Gemini 3.5 Flash.
  • Gemini 3.5 Flash accepts more context: 1.05M tokens versus 128K.

Side by side

Gemini 3.5 FlashGPT-4o mini
ProviderGoogleOpenAI
Noometry Index54.225.5
Released2026-05-192024-07-18
WeightsProprietaryProprietary
Context window1.05M128K
Max output66K16K
Input $ / M tokens$1.50$0.15
Output $ / M tokens$9$0.60
Results tracked5460

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Category by category

Coding Gemini 3.5 Flash leads

Gemini 3.5 Flash: 49.4 (#49), GPT-4o mini: 22.0 (#335)

BenchmarkGemini 3.5 FlashGPT-4o mini
WeirdML62.6%11.8%
LMArena Coding14921290
SWE-bench Verified79.3%—
DeepSWE37.4%—
Aider Polyglot—3.6%
LMArena WebDev1499—
SciCode53.1%—
BigCodeBench Instruct—46.1%
LiveBench Coding—43.1%
BigCodeBench Complete—57.4%
ALE-Bench911.02—
HumanEval+—83.5%
MBPP+—72.2%

Agentic & Tool Use GPT-4o mini leads

Gemini 3.5 Flash: 24.7 (#114), GPT-4o mini: 27.5 (#101)

BenchmarkGemini 3.5 FlashGPT-4o mini
APEX-Agents27.5%—
BALROG—17.4%
GBAEval6.7%—
GDP.pdf14%—
Vending-Bench 25,396—

Reasoning Gemini 3.5 Flash leads

Gemini 3.5 Flash: 62.8 (#18), GPT-4o mini: 8.7 (#347)

BenchmarkGemini 3.5 FlashGPT-4o mini
ARC-AGI-272.1%0%
SimpleBench76.7%10.7%
Chess Puzzles50%0%
LMArena Hard Prompts14881267
Mystery Game Puzzles32%12%
DTBench94.7%54.4%
LMCA47.1%10.4%
Epoch Capabilities Index154.46126.56
Kagi LLM Benchmark—28.8%
NYT Connections (extended)92.6%—
ARC-AGI-192.5%—
CritPt13.1%—
EnigmaEval25.4%—
EBR-Bench4.8%—
LiveBench Reasoning—32.8%
LiveBench Data Analysis—50%
Surface Evolver Bench58.1%—
ForecastBench59—
LiveBench—41.3%
PIQA—88.7%

Math Gemini 3.5 Flash leads

Gemini 3.5 Flash: 60.7 (#36), GPT-4o mini: 10.4 (#314)

BenchmarkGemini 3.5 FlashGPT-4o mini
FrontierMath (Tiers 1-3)62.8%0.7%
OTIS Mock AIME 2024-202595.6%6.9%
LMArena Math15041267
FrontierMath Tier 426.8%—
MathArena Final-Answer Competitions76.3%—
ProofBench31%—
Omni-MATH—28%
LiveBench Math—36.3%
MATH Level 5—52.6%
FrontierMath (Feb 2025 set)39%—
FrontierMath Tier 4 (v1)14.6%—
GSM8K—91.3%

Knowledge Gemini 3.5 Flash leads

Gemini 3.5 Flash: 66.3 (#11), GPT-4o mini: 17.7 (#284)

BenchmarkGemini 3.5 FlashGPT-4o mini
GPQA Diamond92.8%37.7%
SimpleQA Verified66.2%8.3%
LMArena Expert14951235
MMLU-Pro—60.3%
Confabulations—37.2%
GPQA (HELM)—36.8%
BoolQ—88.7%
MMLU—81.8%

Multimodal Gemini 3.5 Flash leads

Gemini 3.5 Flash: 45.7 (#15), GPT-4o mini: 25.9 (#122)

BenchmarkGemini 3.5 FlashGPT-4o mini
LMArena Vision13101066
Video-MME—64.8%
GeoBench—64%
VPCT—34%
Blueprint-Bench 233.6%—
LMArena Document1463—

Multilingual Gemini 3.5 Flash leads

Gemini 3.5 Flash: 57.0 (#13), GPT-4o mini: 42.0 (#199)

BenchmarkGemini 3.5 FlashGPT-4o mini
LMArena Non-English14761266
LMArena Chinese15261265
LMArena French14901297
LMArena German14921272
LMArena Japanese14861216
LMArena Korean14511195
LMArena Russian14931275
LMArena Spanish14801276

Instruction Following Gemini 3.5 Flash leads

Gemini 3.5 Flash: 77.0 (#30), GPT-4o mini: 61.9 (#239)

BenchmarkGemini 3.5 FlashGPT-4o mini
LMArena Instruction Following14671258
LiveBench Instruction Following—56.8%
IFEval—78.2%

Long Context Gemini 3.5 Flash leads

Gemini 3.5 Flash: 45.4 (#38), GPT-4o mini: 39.1 (#186)

BenchmarkGemini 3.5 FlashGPT-4o mini
LMArena Longer Query14821289

Writing & Preference Gemini 3.5 Flash leads

Gemini 3.5 Flash: 65.5 (#47), GPT-4o mini: 39.5 (#248)

BenchmarkGemini 3.5 FlashGPT-4o mini
LMArena Text14821286
LMArena Creative Writing14701268
LMArena Multi-Turn14811285
Short-Story Creative Writing—67.2%
EQ-Bench Creative Writing—873
WildBench—79.1%
EQ-Bench 41087—
LiveBench Language—28.6%

Frequently asked questions

Is Gemini 3.5 Flash better than GPT-4o mini?

Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 25.5 on the Noometry Index. GPT-4o mini costs 13× less per token, which makes it the better buy when Gemini 3.5 Flash's lead doesn't matter for your workload.

Which is cheaper, Gemini 3.5 Flash or GPT-4o mini?

GPT-4o mini is cheaper. It lists at $0.15 per million input tokens and $0.60 per million output tokens; Gemini 3.5 Flash lists at $1.50 and $9.

Is Gemini 3.5 Flash or GPT-4o mini better for coding?

Gemini 3.5 Flash scores higher on coding benchmarks: 49.4 versus 22.0 in the Noometry coding category.

Which has the bigger context window?

Gemini 3.5 Flash does, with 1.05M tokens against 128K.

How many benchmarks do Gemini 3.5 Flash and GPT-4o mini share?

30 benchmarks have published results for both models. Gemini 3.5 Flash has 54 scored results on Noometry and GPT-4o mini has 60.

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