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Gemma 4 26B A4B vs gpt-oss-20b

Gemma 4 26B A4B leads gpt-oss-20b on the Artificial Analysis Intelligence Index, 16.7 to 10.0, and gpt-oss-20b costs 4.0x less per output token ($0.15 vs $0.60 per million). Updated October 22, 2026; 38 benchmarks have a result for both.

Replace Gemma 4 26B A4B Replace gpt-oss-20b
Gemma 4 26B A4BGoogle
Coding
No data
Overall
54.7
Output $/M
$0.60
36
gpt-oss-20bOpenAI
Coding
No data
Overall
38.5
Output $/M
$0.15
2
vs boards won of 38 shared

Gemma 4 26B A4B or gpt-oss-20b: which to pick

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

Pick Gemma 4 26B A4B for a larger context window (262K against 131K tokens) and work measured by WeirdML or τ²-Bench Telecom, where it leads.

Model AGemma 4 26B A4BGoogleNot benchmarked1 independent benchmarkNo cost per solved taskModel Bgpt-oss-20bOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
38
Gemma 4 26B A4B only
17
gpt-oss-20b only
24
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 4 26B A4B not benchmarked, gpt-oss-20b not benchmarked.
Widest category
General, 24.7 points apart on average over 16 shared benchmarks.
Widest single gap
LMArena Text: creative writing: Gemma 4 26B A4B 1400 against gpt-oss-20b 1201, 33.2 points apart on a 0 to 100 scale.
Output price
Gemma 4 26B A4B $0.60 against gpt-oss-20b $0.15 per million output tokens, 4.0x apart.
Context window
Gemma 4 26B A4B takes 262K tokens, gpt-oss-20b 131K.

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 4 26B A4BBarsgpt-oss-20bTies
Coding51
Intelligence20
Agentic work01
Reasoning60
Math30
Knowledge40
General160
All shared boards362
CodingLike-for-likeSix of these boards feed the Vibe Coding Index51
Coding benchmarks for Gemma 4 26B A4B and gpt-oss-20b
BenchmarkGemma 4 26B A4Bgpt-oss-20bLeader
LMArena WebDev1360Not measuredOnly Gemma 4 26B A4B measured
AA Coding Index39.3Not measuredOnly Gemma 4 26B A4B measured
LiveCodeBench (Vals AI)Not measured80.4%Only gpt-oss-20b measured
LiveCodeBench (Artificial Analysis run)Not measured77.7%Only gpt-oss-20b measured
SciCode40.0%38.9%Gemma 4 26B A4B
Terminal-Bench Hard (Artificial Analysis run)25.0%10.6%Gemma 4 26B A4B
Terminal-BenchNot measured3.4%Only gpt-oss-20b measured
WeirdML35.2%40.9%gpt-oss-20b
ALE-Bench927.2566.0Gemma 4 26B A4B
LMArena Text: coding14461307Gemma 4 26B A4B
LMArena Text: software and IT14541311Gemma 4 26B A4B
LMArena WebDev: React1351Not measuredOnly Gemma 4 26B A4B measured
LMArena WebDev: HTML1362Not measuredOnly Gemma 4 26B A4B measured
Neither model has a result on the other 26 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Gemma 4 26B A4B and gpt-oss-20b
BenchmarkGemma 4 26B A4Bgpt-oss-20bLeader
AA Intelligence Index16.710.0Gemma 4 26B A4B
Epoch Capabilities Index141.9137.7Gemma 4 26B A4B
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for Gemma 4 26B A4B and gpt-oss-20b
BenchmarkGemma 4 26B A4Bgpt-oss-20bLeader
AA Agentic Index2.9Not measuredOnly Gemma 4 26B A4B measured
τ²-Bench Telecom43.6%60.2%gpt-oss-20b
BrowseComp-PlusNot measured50.6%Only gpt-oss-20b measured
Neither model has a result on the other 38 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index60
Reasoning benchmarks for Gemma 4 26B A4B and gpt-oss-20b
BenchmarkGemma 4 26B A4Bgpt-oss-20bLeader
GPQA DiamondNot measured68.9%Only gpt-oss-20b measured
GPQA Diamond (Artificial Analysis run)79.2%68.8%Gemma 4 26B A4B
Humanity's Last Exam (Artificial Analysis run)19.3%11.0%Gemma 4 26B A4B
GPQA Diamond (Epoch AI run)73.2%60.8%Gemma 4 26B A4B
LMArena Text: hard prompts14381274Gemma 4 26B A4B
LMArena Text: expert14471258Gemma 4 26B A4B
LMArena Text: hard prompts in English14481292Gemma 4 26B A4B
LMArena Vision: diagrams1264Not measuredOnly Gemma 4 26B A4B measured
LMArena Vision: homework1293Not measuredOnly Gemma 4 26B A4B measured
Kagi LLM BenchmarkNot measured53.2%Only gpt-oss-20b measured
Neither model has a result on the other 12 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for Gemma 4 26B A4B and gpt-oss-20b
BenchmarkGemma 4 26B A4Bgpt-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 IndexNot measured89.3Only gpt-oss-20b measured
AIME 2025 (Artificial Analysis run)Not measured89.3%Only gpt-oss-20b measured
OTIS Mock AIME82.2%65.3%Gemma 4 26B A4B
LMArena Text: math14701317Gemma 4 26B A4B
LMArena Text: mathematical work14751305Gemma 4 26B A4B
Neither model has a result on the other 5 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for Gemma 4 26B A4B and gpt-oss-20b
BenchmarkGemma 4 26B A4Bgpt-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)Not measured74.8%Only gpt-oss-20b measured
LMArena Text: science14461296Gemma 4 26B A4B
LMArena Text: medicine and healthcare14281310Gemma 4 26B A4B
LMArena Text: legal and government14571280Gemma 4 26B A4B
LMArena Text: business and finance14291284Gemma 4 26B A4B
FACTS Benchmark Suite42.7%Not measuredOnly Gemma 4 26B A4B measured
Neither model has a result on the other 6 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
Web design benchmarks for Gemma 4 26B A4B and gpt-oss-20b
BenchmarkGemma 4 26B A4Bgpt-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 index160
General benchmarks for Gemma 4 26B A4B and gpt-oss-20b
BenchmarkGemma 4 26B A4Bgpt-oss-20bLeader
IFBench72.4%65.1%Gemma 4 26B A4B
Long context reasoning (AA-LCR)65.7%34.7%Gemma 4 26B A4B
DTBench74.9%68.0%Gemma 4 26B A4B
LMCA29.7%14.5%Gemma 4 26B A4B
LMArena Text14341288Gemma 4 26B A4B
LMArena Text: instruction following14201236Gemma 4 26B A4B
LMArena Text: creative writing14001201Gemma 4 26B A4B
LMArena Vision1260Not measuredOnly Gemma 4 26B A4B measured
LMArena Text: English14441303Gemma 4 26B A4B
LMArena Text: non-English14211269Gemma 4 26B A4B
LMArena Text: Chinese14951315Gemma 4 26B A4B
LMArena Text: GermanNot measured1255Only gpt-oss-20b measured
LMArena Text: JapaneseNot measured1244Only gpt-oss-20b measured
LMArena Text: KoreanNot measured1236Only gpt-oss-20b measured
LMArena Text: French1460Not measuredOnly Gemma 4 26B A4B measured
LMArena Text: Spanish14151267Gemma 4 26B A4B
LMArena Text: Russian14341278Gemma 4 26B A4B
LMArena Text: PolishNot measured1252Only gpt-oss-20b measured
LMArena Text: multi-turn14411268Gemma 4 26B A4B
LMArena Text: longer queries14271250Gemma 4 26B A4B
LMArena Text: writing and language14051238Gemma 4 26B A4B
LMArena Text: entertainment and media14031216Gemma 4 26B A4B
LMArena Vision: English1256Not measuredOnly Gemma 4 26B A4B measured
LMArena Vision: Chinese1312Not measuredOnly Gemma 4 26B A4B measured
LMArena Vision: reading text1268Not measuredOnly Gemma 4 26B A4B measured
LMArena Vision: humor1272Not measuredOnly Gemma 4 26B A4B measured
LMArena Vision: captioning1297Not measuredOnly Gemma 4 26B A4B measured
LMArena Vision: recognizing things1191Not measuredOnly Gemma 4 26B A4B measured
LMArena Vision: creative writing1256Not measuredOnly Gemma 4 26B A4B measured
Neither model has a result on the other 17 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Gemma 4 26B A4B and gpt-oss-20b
BenchmarkGemma 4 26B A4Bgpt-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 4 26B A4B$0.0004Fits in one request
gpt-oss-20b$0.0001Fits in one request

gpt-oss-20b costs less

Repository review

50K input + 3K output tokens

Gemma 4 26B A4B$0.0093Fits in one request
gpt-oss-20b$0.0019Fits in one request

gpt-oss-20b costs less

Agent loop

200K input + 10K output tokens

Gemma 4 26B A4B$0.036Fits in one request
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 4 26B A4B and gpt-oss-20b
SpecificationGoogle Gemma 4 26B A4BOpenAI gpt-oss-20b
MakerGoogleOpenAI
WeightsOpen weightsOpen weights
ReleasedApril 3, 2026August 5, 2025
Context window262K131K
Input $/Mtok$0.15$0.03
Output $/Mtok$0.60$0.15
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it10
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Gemma 4 26B A4B better than gpt-oss-20b for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick Gemma 4 26B A4B for a larger context window (262K against 131K tokens) and work measured by WeirdML or τ²-Bench Telecom, where it leads.

Which is cheaper, Gemma 4 26B A4B or gpt-oss-20b?

Gemma 4 26B A4B costs $0.15 per million input tokens and $0.60 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 4 26B A4B or gpt-oss-20b?

Gemma 4 26B A4B, with 262K tokens against 131K.

How many benchmarks is the Gemma 4 26B A4B vs gpt-oss-20b comparison based on?

38 benchmarks have a result for both models as of October 22, 2026. Gemma 4 26B A4B's coding index rests on 1 independent benchmark 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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