Noometry

Model comparison

Gemini 3 Flash Preview vs gpt-oss-120b

Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 36.3 on the Noometry Index. gpt-oss-120b costs 16× less per token, which makes it the better buy when Gemini 3 Flash Preview's lead doesn't matter for your workload.

Last verified . 31 shared benchmarks.

Gemini 3 Flash Preview Google

52.3

Rank #40 Confirmed

gpt-oss-120b OpenAI

36.3

Rank #217 Confirmed

Summary

  • They share 31 benchmarks with published results for both. Gemini 3 Flash Preview scores higher in 8 categories and gpt-oss-120b in 1 category; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Gemini 3 Flash Preview leads 49.2 to 20.0.
  • The biggest single-benchmark swing is SWE-bench Verified (bash only): 75.8% for Gemini 3 Flash Preview and 26% for gpt-oss-120b.
  • gpt-oss-120b is cheaper at $0.037 / $0.17 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 131K.
  • gpt-oss-120b has downloadable open weights; the other is API-only.

Side by side

Gemini 3 Flash Previewgpt-oss-120b
ProviderGoogleOpenAI
Noometry Index52.336.3
Released2025-12-172025-08-05
WeightsProprietaryOpen
Context window1.05M131K
Max output66K41K
Input $ / M tokens$0.50$0.037
Output $ / M tokens$3$0.17
Results tracked5948

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Category by category

Coding Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 50.9 (#42), gpt-oss-120b: 33.5 (#256)

BenchmarkGemini 3 Flash Previewgpt-oss-120b
SWE-bench Verified (bash only)75.8%26%
WeirdML61.6%48.2%
LMArena Coding14601380
ALE-Bench1,367575.62
SWE-bench Verified75.4%—
Aider Polyglot—41.8%
LMArena WebDev1439—
SWE-bench Multilingual72.7%—
SciCode—36%
GSO9.8%—
AlgoTune—1.41

Agentic & Tool Use Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 38.7 (#29), gpt-oss-120b: 12.2 (#153)

BenchmarkGemini 3 Flash Previewgpt-oss-120b
Terminal-Bench64.3%18.7%
Vending-Bench 23,635-21.53
APEX-Agents—4.4%
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—
METR Time Horizons—56.6%

Reasoning Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 49.2 (#37), gpt-oss-120b: 20.0 (#245)

BenchmarkGemini 3 Flash Previewgpt-oss-120b
SimpleBench61.1%22.1%
Chess Puzzles40%20%
LMArena Hard Prompts14651364
Mystery Game Puzzles26%2%
DTBench89.1%76.3%
LMCA43.1%22.1%
Epoch Capabilities Index151.8139.93
ARC-AGI-233.6%—
Kagi LLM Benchmark—58.6%
NYT Connections (extended)83.1%—
ARC-AGI-184.7%—
CritPt—1.1%
Surface Evolver Bench—25%
ForecastBench58.5—

Math Too close to call

Gemini 3 Flash Preview: 51.7 (#55), gpt-oss-120b: 52.5 (#50)

BenchmarkGemini 3 Flash Previewgpt-oss-120b
OTIS Mock AIME 2024-202595.6%88.9%
LMArena Math14731389
FrontierMath (Tiers 1-3)51.2%—
FrontierMath Tier 417.1%—
MathArena Final-Answer Competitions67.6%—
ProofBench15%—
Omni-MATH—68.8%
FrontierMath (Feb 2025 set)35.6%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 58.8 (#33), gpt-oss-120b: 42.4 (#96)

BenchmarkGemini 3 Flash Previewgpt-oss-120b
GPQA Diamond89.4%75.8%
Vectara Hallucination Rate13.5%14.2%
LMArena Expert14621356
SimpleQA Verified66.8%—
MMLU-Pro—79.5%
Confabulations—15.7%
GPQA (HELM)—68.4%

Multimodal Not comparable

Gemini 3 Flash Preview: 45.5 (#16), gpt-oss-120b: —

BenchmarkGemini 3 Flash Previewgpt-oss-120b
LMArena Vision1285—
GeoBench88%—
VPCT72.6%—
Blueprint-Bench 20%—
LMArena Document1413—

Multilingual Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 55.7 (#27), gpt-oss-120b: 48.0 (#147)

BenchmarkGemini 3 Flash Previewgpt-oss-120b
LMArena Non-English14581351
LMArena Chinese15111385
LMArena French14771369
LMArena German14971353
LMArena Japanese14891331
LMArena Korean14431282
LMArena Russian14801343
LMArena Spanish14691389

Instruction Following Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 75.7 (#56), gpt-oss-120b: 69.3 (#173)

BenchmarkGemini 3 Flash Previewgpt-oss-120b
LMArena Instruction Following14371318
IFEval—83.6%

Long Context Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 44.4 (#67), gpt-oss-120b: 31.4 (#278)

BenchmarkGemini 3 Flash Previewgpt-oss-120b
LMArena Longer Query14521319
Fiction.LiveBench—44.4%

Writing & Preference Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 65.5 (#45), gpt-oss-120b: 46.5 (#217)

BenchmarkGemini 3 Flash Previewgpt-oss-120b
LMArena Text14661365
LMArena Creative Writing14571275
LMArena Multi-Turn14711340
Short-Story Creative Writing—77.1%
EQ-Bench Creative Writing—961
WildBench—84.5%

Frequently asked questions

Is Gemini 3 Flash Preview better than gpt-oss-120b?

Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 36.3 on the Noometry Index. gpt-oss-120b costs 16× 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-oss-120b?

gpt-oss-120b is cheaper. It lists at $0.037 per million input tokens and $0.17 per million output tokens; Gemini 3 Flash Preview lists at $0.50 and $3.

Is Gemini 3 Flash Preview or gpt-oss-120b better for coding?

Gemini 3 Flash Preview scores higher on coding benchmarks: 50.9 versus 33.5 in the Noometry coding category.

Which has the bigger context window?

Gemini 3 Flash Preview does, with 1.05M tokens against 131K.

How many benchmarks do Gemini 3 Flash Preview and gpt-oss-120b share?

31 benchmarks have published results for both models. Gemini 3 Flash Preview has 59 scored results on Noometry and gpt-oss-120b has 48.

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