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Gemma 3 12B vs gpt-oss-20b

gpt-oss-20b leads Gemma 3 12B on the Artificial Analysis Intelligence Index, 10.0 to 3.8, at about the same output price ($0.15 vs $0.1625 per million). Updated October 22, 2026; 39 benchmarks have a result for both.

Replace Gemma 3 12B Replace gpt-oss-20b
Gemma 3 12BGoogle
Coding
No data
Overall
28.0
Output $/M
$0.1625
19
gpt-oss-20bOpenAI
Coding
No data
Overall
38.5
Output $/M
$0.15
20
vs boards won of 39 shared

Gemma 3 12B or gpt-oss-20b: which to pick

Neither model has a coding score yet, so the two cannot be ranked on coding.

Pick Gemma 3 12B for work measured by LiveCodeBench (Artificial Analysis run) or SciCode, where it leads.

Model AGemma 3 12BGoogleNot benchmarkedNo coding benchmarkNo cost per solved taskModel Bgpt-oss-20bOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
39
Gemma 3 12B only
4
gpt-oss-20b only
23
Like-for-like categories
7 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Gemma 3 12B not benchmarked, gpt-oss-20b not benchmarked.
Widest category
Agentic work, 49.4 points apart on average over 1 shared benchmark.
Widest single gap
AA Math Index: Gemma 3 12B 18.3 against gpt-oss-20b 89.3, 71.0 points apart on a 0 to 100 scale.
Output price
Gemma 3 12B $0.1625 against gpt-oss-20b $0.15 per million output tokens, 1.1x apart.
Context window
Both take 131K tokens.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryGemma 3 12BBarsgpt-oss-20bTies
Coding14
Intelligence02
Agentic work01
Reasoning24
Math14
Knowledge41
General114
All shared boards1920
CodingLike-for-likeSix of these boards feed the Vibe Coding Index14
Coding benchmarks for Gemma 3 12B and gpt-oss-20b
BenchmarkGemma 3 12Bgpt-oss-20bLeader
AA Coding Index5.8Not measuredOnly Gemma 3 12B measured
LiveCodeBench (Vals AI)Not measured80.4%Only gpt-oss-20b measured
LiveCodeBench (Artificial Analysis run)13.7%77.7%gpt-oss-20b
SciCode16.4%38.9%gpt-oss-20b
Terminal-Bench Hard (Artificial Analysis run)0.8%10.6%gpt-oss-20b
Terminal-BenchNot measured3.4%Only gpt-oss-20b measured
WeirdMLNot measured40.9%Only gpt-oss-20b measured
ALE-BenchNot measured566.0Only gpt-oss-20b measured
LMArena Text: coding12811307gpt-oss-20b
LMArena Text: software and IT13131311Gemma 3 12B
SciCode0.0%Not measuredOnly Gemma 3 12B measured
Neither model has a result on the other 28 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Gemma 3 12B and gpt-oss-20b
BenchmarkGemma 3 12Bgpt-oss-20bLeader
AA Intelligence Index3.810.0gpt-oss-20b
Epoch Capabilities Index123.5137.7gpt-oss-20b
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for Gemma 3 12B and gpt-oss-20b
BenchmarkGemma 3 12Bgpt-oss-20bLeader
AA Agentic Index0.1Not measuredOnly Gemma 3 12B measured
τ²-Bench Telecom10.8%60.2%gpt-oss-20b
Berkeley Function Calling Leaderboard (BFCL)30.4%Not measuredOnly Gemma 3 12B measured
BrowseComp-PlusNot measured50.6%Only gpt-oss-20b measured
Neither model has a result on the other 37 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index24
Reasoning benchmarks for Gemma 3 12B and gpt-oss-20b
BenchmarkGemma 3 12Bgpt-oss-20bLeader
GPQA DiamondNot measured68.9%Only gpt-oss-20b measured
GPQA Diamond (Artificial Analysis run)34.9%68.8%gpt-oss-20b
Humanity's Last Exam (Artificial Analysis run)4.2%11.0%gpt-oss-20b
GPQA Diamond (Epoch AI run)39.5%60.8%gpt-oss-20b
LMArena Text: hard prompts13091274Gemma 3 12B
LMArena Text: expert12481258gpt-oss-20b
LMArena Text: hard prompts in English13181292Gemma 3 12B
Kagi LLM BenchmarkNot measured53.2%Only gpt-oss-20b measured
Neither model has a result on the other 14 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index14
Math benchmarks for Gemma 3 12B and gpt-oss-20b
BenchmarkGemma 3 12Bgpt-oss-20bLeader
AIMENot measured86.0%Only gpt-oss-20b measured
MATH 500 (Vals AI)Not measured94.2%Only gpt-oss-20b measured
MGSM (Vals AI)Not measured89.0%Only gpt-oss-20b measured
AA Math Index18.389.3gpt-oss-20b
AIME 2025 (Artificial Analysis run)18.3%89.3%gpt-oss-20b
OTIS Mock AIME16.7%65.3%gpt-oss-20b
LMArena Text: math13071317gpt-oss-20b
LMArena Text: mathematical work13361305Gemma 3 12B
Neither model has a result on the other 5 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index41
Knowledge benchmarks for Gemma 3 12B and gpt-oss-20b
BenchmarkGemma 3 12Bgpt-oss-20bLeader
MMLU ProNot measured71.6%Only gpt-oss-20b measured
LegalBench (Vals AI)Not measured70.8%Only gpt-oss-20b measured
CaseLaw (Vals AI)Not measured43.8%Only gpt-oss-20b measured
CorpFin (Vals AI)Not measured53.1%Only gpt-oss-20b measured
TaxEval (Vals AI)Not measured63.7%Only gpt-oss-20b measured
MedQA (Vals AI)Not measured82.9%Only gpt-oss-20b measured
MMLU Pro (Artificial Analysis run)59.5%74.8%gpt-oss-20b
LMArena Text: science13661296Gemma 3 12B
LMArena Text: medicine and healthcare13341310Gemma 3 12B
LMArena Text: legal and government13811280Gemma 3 12B
LMArena Text: business and finance13761284Gemma 3 12B
Neither model has a result on the other 7 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
Web design benchmarks for Gemma 3 12B and gpt-oss-20b
BenchmarkGemma 3 12Bgpt-oss-20bLeader
Design Arena: websitesNot measured852Only gpt-oss-20b measured
Design Arena: data vizNot measured933Only gpt-oss-20b measured
Neither model has a result on the other 7 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index114
General benchmarks for Gemma 3 12B and gpt-oss-20b
BenchmarkGemma 3 12Bgpt-oss-20bLeader
IFBench36.7%65.1%gpt-oss-20b
Long context reasoning (AA-LCR)8.3%34.7%gpt-oss-20b
DTBench48.8%68.0%gpt-oss-20b
LMCA4.5%14.5%gpt-oss-20b
LMArena Text13341288Gemma 3 12B
LMArena Text: instruction following12991236Gemma 3 12B
LMArena Text: creative writing13311201Gemma 3 12B
LMArena Text: English13491303Gemma 3 12B
LMArena Text: non-English13181269Gemma 3 12B
LMArena Text: ChineseNot measured1315Only gpt-oss-20b measured
LMArena Text: German13701255Gemma 3 12B
LMArena Text: JapaneseNot measured1244Only gpt-oss-20b measured
LMArena Text: KoreanNot measured1236Only gpt-oss-20b measured
LMArena Text: SpanishNot measured1267Only gpt-oss-20b measured
LMArena Text: Russian13351278Gemma 3 12B
LMArena Text: PolishNot measured1252Only gpt-oss-20b measured
LMArena Text: multi-turn13341268Gemma 3 12B
LMArena Text: longer queries13171250Gemma 3 12B
LMArena Text: writing and language13071238Gemma 3 12B
LMArena Text: entertainment and media12971216Gemma 3 12B
Neither model has a result on the other 26 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Gemma 3 12B and gpt-oss-20b
BenchmarkGemma 3 12Bgpt-oss-20bLeader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Gemma 3 12B$0.0002Fits in one request
gpt-oss-20b$0.0001Fits in one request

gpt-oss-20b costs less

Repository review

50K input + 3K output tokens

Gemma 3 12B$0.0042Fits in one request
gpt-oss-20b$0.0019Fits in one request

gpt-oss-20b costs less

Agent loop

200K input + 10K output tokens

Gemma 3 12B$0.017Exceeds the context window
gpt-oss-20b$0.0075Exceeds the context window

gpt-oss-20b costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Gemma 3 12B and gpt-oss-20b
SpecificationGoogle Gemma 3 12BOpenAI gpt-oss-20b
MakerGoogleOpenAI
WeightsOpen weightsOpen weights
ReleasedMarch 13, 2025August 5, 2025
Context window131K131K
Input $/Mtok$0.075$0.03
Output $/Mtok$0.1625$0.15
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemma 3 12B better than gpt-oss-20b for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick Gemma 3 12B for work measured by LiveCodeBench (Artificial Analysis run) or SciCode, where it leads.

Which is cheaper, Gemma 3 12B or gpt-oss-20b?

Gemma 3 12B costs $0.075 per million input tokens and $0.1625 per million output tokens; gpt-oss-20b costs $0.03 and $0.15. Cost per solved task is known for neither of them.

Which has the bigger context window, Gemma 3 12B or gpt-oss-20b?

Neither: both take 131K tokens.

How many benchmarks is the Gemma 3 12B vs gpt-oss-20b comparison based on?

39 benchmarks have a result for both models as of October 22, 2026. Gemma 3 12B's coding index rests on 0 independent benchmarks and gpt-oss-20b's on 0. Where only one model has a result, the page says so instead of naming a winner.

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