Noometry

Model comparison

Gemini 3 Flash Preview vs gpt-oss-20b

Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 32.5 on the Noometry Index. gpt-oss-20b costs 31× less per token, which makes it the better buy when Gemini 3 Flash Preview's lead doesn't matter for your workload.

Last verified . 25 shared benchmarks.

Gemini 3 Flash Preview Google

52.3

Rank #40 Confirmed

gpt-oss-20b OpenAI

32.5

Rank #255 Confirmed

Summary

  • They share 25 benchmarks with published results for both. Gemini 3 Flash Preview scores higher in 9 categories and gpt-oss-20b 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 19.3.
  • The biggest single-benchmark swing is Terminal-Bench: 64.3% for Gemini 3 Flash Preview and 3.4% for gpt-oss-20b.
  • gpt-oss-20b is cheaper at $0.018 / $0.09 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-20b has downloadable open weights; the other is API-only.

Side by side

Gemini 3 Flash Previewgpt-oss-20b
ProviderGoogleOpenAI
Noometry Index52.332.5
Released2025-12-172025-08-05
WeightsProprietaryOpen
Context window1.05M131K
Max output66K16K
Input $ / M tokens$0.50$0.018
Output $ / M tokens$3$0.09
Results tracked5934

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Category by category

Coding Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 50.9 (#42), gpt-oss-20b: 37.6 (#192)

BenchmarkGemini 3 Flash Previewgpt-oss-20b
WeirdML61.6%40.9%
LMArena Coding14601306
ALE-Bench1,367566.05
SWE-bench Verified75.4%—
SWE-bench Verified (bash only)75.8%—
LMArena WebDev1439—
SWE-bench Multilingual72.7%—
SciCode—34.4%
GSO9.8%—

Agentic & Tool Use Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 38.7 (#29), gpt-oss-20b: 9.3 (#154)

BenchmarkGemini 3 Flash Previewgpt-oss-20b
Terminal-Bench64.3%3.4%
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—
Vending-Bench 23,635—

Reasoning Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 49.2 (#37), gpt-oss-20b: 19.3 (#261)

BenchmarkGemini 3 Flash Previewgpt-oss-20b
Chess Puzzles40%4%
LMArena Hard Prompts14651274
DTBench89.1%68%
LMCA43.1%14.5%
Epoch Capabilities Index151.8137.82
ARC-AGI-233.6%—
SimpleBench61.1%—
Kagi LLM Benchmark—53.2%
NYT Connections (extended)83.1%—
ARC-AGI-184.7%—
CritPt—1.4%
Mystery Game Puzzles26%—
ForecastBench58.5—

Math Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 51.7 (#55), gpt-oss-20b: 39.4 (#103)

BenchmarkGemini 3 Flash Previewgpt-oss-20b
OTIS Mock AIME 2024-202595.6%65.3%
LMArena Math14731317
FrontierMath (Tiers 1-3)51.2%—
FrontierMath Tier 417.1%—
MathArena Final-Answer Competitions67.6%—
ProofBench15%—
Omni-MATH—56.5%
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-20b: 34.6 (#195)

BenchmarkGemini 3 Flash Previewgpt-oss-20b
GPQA Diamond89.4%60.8%
LMArena Expert14621258
SimpleQA Verified66.8%—
MMLU-Pro—74%
Vectara Hallucination Rate13.5%—
GPQA (HELM)—59.4%

Multimodal Not comparable

Gemini 3 Flash Preview: 45.5 (#16), gpt-oss-20b: —

BenchmarkGemini 3 Flash Previewgpt-oss-20b
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-20b: 42.2 (#197)

BenchmarkGemini 3 Flash Previewgpt-oss-20b
LMArena Non-English14581268
LMArena Chinese15111314
LMArena German14971255
LMArena Japanese14891244
LMArena Korean14431236
LMArena Russian14801278
LMArena Spanish14691267
LMArena French1477—

Instruction Following Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 75.7 (#56), gpt-oss-20b: 61.8 (#240)

BenchmarkGemini 3 Flash Previewgpt-oss-20b
LMArena Instruction Following14371236
IFEval—73.2%

Long Context Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 44.4 (#67), gpt-oss-20b: 37.9 (#209)

BenchmarkGemini 3 Flash Previewgpt-oss-20b
LMArena Longer Query14521250

Writing & Preference Gemini 3 Flash Preview leads

Gemini 3 Flash Preview: 65.5 (#45), gpt-oss-20b: 35.5 (#265)

BenchmarkGemini 3 Flash Previewgpt-oss-20b
LMArena Text14661287
LMArena Creative Writing14571201
LMArena Multi-Turn14711268
EQ-Bench Creative Writing—666
WildBench—73.7%

Frequently asked questions

Is Gemini 3 Flash Preview better than gpt-oss-20b?

Gemini 3 Flash Preview is the stronger model overall, scoring 52.3 to 32.5 on the Noometry Index. gpt-oss-20b costs 31× 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-20b?

gpt-oss-20b is cheaper. It lists at $0.018 per million input tokens and $0.09 per million output tokens; Gemini 3 Flash Preview lists at $0.50 and $3.

Is Gemini 3 Flash Preview or gpt-oss-20b better for coding?

Gemini 3 Flash Preview scores higher on coding benchmarks: 50.9 versus 37.6 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-20b share?

25 benchmarks have published results for both models. Gemini 3 Flash Preview has 59 scored results on Noometry and gpt-oss-20b has 34.

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