Noometry

Model comparison

Gemini 3.5 Flash vs o3

Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 47.5 on the Noometry Index.

Last verified . 38 shared benchmarks.

Gemini 3.5 Flash Google

54.2

Rank #32 Confirmed

o3 OpenAI

47.5

Rank #61 Confirmed

Summary

  • They share 38 benchmarks with published results for both. Gemini 3.5 Flash scores higher in 8 categories and o3 in 2 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3.5 Flash leads 62.8 to 32.0.
  • The biggest single-benchmark swing is ARC-AGI-2: 72.1% for Gemini 3.5 Flash and 6.5% for o3.
  • Both cost about the same: $1.50 input and $9 output per million tokens.
  • Gemini 3.5 Flash accepts more context: 1.05M tokens versus 200K.

Side by side

Gemini 3.5 Flasho3
ProviderGoogleOpenAI
Noometry Index54.247.5
Released2026-05-192025-04-16
WeightsProprietaryProprietary
Context window1.05M200K
Max output66K100K
Input $ / M tokens$1.50$2
Output $ / M tokens$9$8
Results tracked5463

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Category by category

Coding Gemini 3.5 Flash leads

Gemini 3.5 Flash: 49.4 (#49), o3: 46.8 (#64)

BenchmarkGemini 3.5 Flasho3
SWE-bench Verified79.3%62.3%
WeirdML62.6%52.4%
LMArena Coding14921408
ALE-Bench911.02933.55
DeepSWE37.4%—
SWE-bench Verified (bash only)—58.4%
Aider Polyglot—81.3%
LMArena WebDev1499—
SciCode53.1%—
GSO—8.8%
CadEval—74%

Agentic & Tool Use o3 leads

Gemini 3.5 Flash: 24.7 (#114), o3: 34.5 (#44)

BenchmarkGemini 3.5 Flasho3
APEX-Agents27.5%—
Berkeley Function Calling Leaderboard—63%
GDPval—30.8%
DeepResearch Bench—45.2%
OSWorld—23%
GBAEval6.7%—
GDP.pdf14%—
LMArena Search—1144
METR Time Horizons—65.4%
Vending-Bench 25,396—

Reasoning Gemini 3.5 Flash leads

Gemini 3.5 Flash: 62.8 (#18), o3: 32.0 (#78)

BenchmarkGemini 3.5 Flasho3
ARC-AGI-272.1%6.5%
SimpleBench76.7%53.1%
ARC-AGI-192.5%60.8%
CritPt13.1%1.4%
Chess Puzzles50%38%
EnigmaEval25.4%13.1%
LMArena Hard Prompts14881402
Mystery Game Puzzles32%29%
DTBench94.7%84.8%
LMCA47.1%39.7%
Epoch Capabilities Index154.46146.86
ForecastBench5962.5
Kagi LLM Benchmark—67.6%
NYT Connections (extended)92.6%—
EBR-Bench4.8%—
Surface Evolver Bench58.1%—

Math Gemini 3.5 Flash leads

Gemini 3.5 Flash: 60.7 (#36), o3: 50.2 (#58)

BenchmarkGemini 3.5 Flasho3
FrontierMath (Tiers 1-3)62.8%33.3%
OTIS Mock AIME 2024-202595.6%84.4%
LMArena Math15041426
FrontierMath (Feb 2025 set)39%18.7%
FrontierMath Tier 4 (v1)14.6%2.1%
FrontierMath Tier 426.8%—
MathArena Final-Answer Competitions76.3%—
ProofBench31%—
Omni-MATH—71.4%
MATH Level 5—97.8%

Knowledge Gemini 3.5 Flash leads

Gemini 3.5 Flash: 66.3 (#11), o3: 54.6 (#52)

BenchmarkGemini 3.5 Flasho3
GPQA Diamond92.8%81.8%
SimpleQA Verified66.2%49.4%
LMArena Expert14951402
Humanity's Last Exam—20.3%
MMLU-Pro—85.9%
Confabulations—14.4%
GPQA (HELM)—75.3%

Multimodal Gemini 3.5 Flash leads

Gemini 3.5 Flash: 45.7 (#15), o3: 41.4 (#36)

BenchmarkGemini 3.5 Flasho3
LMArena Vision13101214
GeoBench—74%
VPCT—52%
Blueprint-Bench 233.6%—
LMArena Document1463—

Multilingual Gemini 3.5 Flash leads

Gemini 3.5 Flash: 57.0 (#13), o3: 51.7 (#105)

BenchmarkGemini 3.5 Flasho3
LMArena Non-English14761401
LMArena Chinese15261437
LMArena French14901430
LMArena German14921420
LMArena Japanese14861403
LMArena Korean14511370
LMArena Russian14931406
LMArena Spanish14801395

Instruction Following Gemini 3.5 Flash leads

Gemini 3.5 Flash: 77.0 (#30), o3: 72.8 (#127)

BenchmarkGemini 3.5 Flasho3
LMArena Instruction Following14671368
IFEval—86.9%

Long Context o3 leads

Gemini 3.5 Flash: 45.4 (#38), o3: 53.3 (#6)

BenchmarkGemini 3.5 Flasho3
LMArena Longer Query14821372
Fiction.LiveBench—88.9%
CL-bench—17.8%

Writing & Preference Gemini 3.5 Flash leads

Gemini 3.5 Flash: 65.5 (#47), o3: 63.5 (#64)

BenchmarkGemini 3.5 Flasho3
LMArena Text14821410
LMArena Creative Writing14701359
LMArena Multi-Turn14811405
Short-Story Creative Writing—83.9%
EQ-Bench Creative Writing—1676
WildBench—86.1%
EQ-Bench 41087—

Frequently asked questions

Is Gemini 3.5 Flash better than o3?

Gemini 3.5 Flash is the stronger model overall, scoring 54.2 to 47.5 on the Noometry Index.

Which is cheaper, Gemini 3.5 Flash or o3?

Gemini 3.5 Flash is cheaper. It lists at $1.50 per million input tokens and $9 per million output tokens; o3 lists at $2 and $8.

Is Gemini 3.5 Flash or o3 better for coding?

Gemini 3.5 Flash scores higher on coding benchmarks: 49.4 versus 46.8 in the Noometry coding category.

Which has the bigger context window?

Gemini 3.5 Flash does, with 1.05M tokens against 200K.

How many benchmarks do Gemini 3.5 Flash and o3 share?

38 benchmarks have published results for both models. Gemini 3.5 Flash has 54 scored results on Noometry and o3 has 63.

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