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gpt-oss-20b vs o4 Mini

Updated October 21, 2026. 56 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace gpt-oss-20b Replace o4 Mini
gpt-oss-20bOpenAI
Coding
No data
Overall
10.0
Output $/M
$0.15
2
o4 MiniOpenAI
Coding
No data
Overall
16.7
Output $/M
$4.40
53
vs boards won of 56 shared, 1 tied

Decision reading

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

gpt-oss-20b has the edge where output tokens cost 29.3x less, and where what matters is LiveCodeBench (Vals AI) or LiveCodeBench (Artificial Analysis run), where it leads.

Model Agpt-oss-20bOpenAINot benchmarkedNo coding benchmarkNo cost per solved taskModel Bo4 MiniOpenAINot benchmarkedNo coding benchmarkNo cost per solved task
Shared results
56
gpt-oss-20b only
4
o4 Mini only
38
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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
gpt-oss-20b not benchmarked, o4 Mini not benchmarked.
Widest category
General, 12.5 points apart on average over 20 shared benchmarks.
Widest single gap
Long context reasoning (AA-LCR): gpt-oss-20b 34.7% against o4 Mini 61.0%, 26.3 points apart on a 0 to 100 scale.
Output price
gpt-oss-20b $0.15 against o4 Mini $4.40 per million output tokens, 29.3x apart.
Context window
gpt-oss-20b takes 131K tokens, o4 Mini 200K.

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
Categorygpt-oss-20bBarso4 MiniTies
Coding06
Intelligence02
Agentic work10
Reasoning07
Math161 tie
Knowledge010
Web design02
General020
All shared boards2531 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index06
Coding benchmarks for gpt-oss-20b and o4 Mini
Benchmarkgpt-oss-20bo4 MiniLeader
Aider polyglotNot measured72.0%Only o4 Mini measured
SWE-bench VerifiedNot measured64.6%Only o4 Mini measured
SWE-bench MultimodalNot measured33.9%Only o4 Mini measured
LiveCodeBench (Vals AI)80.4%82.2%o4 Mini
LiveCodeBench (Artificial Analysis run)77.7%85.9%o4 Mini
SciCode38.9%Not measuredOnly gpt-oss-20b measured
Terminal-Bench Hard (Artificial Analysis run)10.6%15.2%o4 Mini
Terminal-Bench3.4%Not measuredOnly gpt-oss-20b measured
GSO-BenchNot measured3.6%Only o4 Mini measured
WeirdML40.9%52.6%o4 Mini
ALE-Bench566.0Not measuredOnly gpt-oss-20b measured
LMArena Text: coding13071368o4 Mini
LMArena Text: software and IT13111367o4 Mini
Neither model has a result on the other 25 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for gpt-oss-20b and o4 Mini
Benchmarkgpt-oss-20bo4 MiniLeader
AA Intelligence Index10.016.7o4 Mini
Epoch Capabilities Index137.7145.5o4 Mini
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for gpt-oss-20b and o4 Mini
Benchmarkgpt-oss-20bo4 MiniLeader
τ²-Bench Telecom60.2%55.6%gpt-oss-20b
METR time horizonsNot measured63.9%Only o4 Mini measured
Neither model has a result on the other 37 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index07
Reasoning benchmarks for gpt-oss-20b and o4 Mini
Benchmarkgpt-oss-20bo4 MiniLeader
GPQA Diamond68.9%74.5%o4 Mini
MMMU Pro (Vals AI)Not measured79.7%Only o4 Mini measured
GPQA Diamond (Artificial Analysis run)68.8%78.4%o4 Mini
Humanity's Last Exam (Artificial Analysis run)11.0%16.5%o4 Mini
GPQA Diamond (Epoch AI run)60.8%79.6%o4 Mini
ARC-AGINot measured58.7%Only o4 Mini measured
ARC-AGI-2Not measured6.1%Only o4 Mini measured
SimpleBenchNot measured38.7%Only o4 Mini measured
Chess puzzlesNot measured22.0%Only o4 Mini measured
Mystery game puzzlesNot measured5.0%Only o4 Mini measured
VPCTNot measured57.5%Only o4 Mini measured
LMArena Text: hard prompts12741351o4 Mini
LMArena Text: expert12581343o4 Mini
LMArena Text: hard prompts in English12921366o4 Mini
LMArena Vision: diagramsNot measured1197Only o4 Mini measured
LMArena Vision: homeworkNot measured1234Only o4 Mini measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index16
Math benchmarks for gpt-oss-20b and o4 Mini
Benchmarkgpt-oss-20bo4 MiniLeader
AIME86.0%83.7%gpt-oss-20b
MATH 500 (Vals AI)94.2%94.2%Tie
MGSM (Vals AI)89.0%93.4%o4 Mini
AA Math Index89.390.7o4 Mini
AIME 2025 (Artificial Analysis run)89.3%90.7%o4 Mini
OTIS Mock AIME65.3%81.7%o4 Mini
FrontierMath, tiers 1 to 3Not measured36.1%Only o4 Mini measured
FrontierMath, tier 4Not measured4.9%Only o4 Mini measured
MATH level 5Not measured97.8%Only o4 Mini measured
LMArena Text: math13171389o4 Mini
LMArena Text: mathematical work13051379o4 Mini
Neither model has a result on the other 2 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index010
Knowledge benchmarks for gpt-oss-20b and o4 Mini
Benchmarkgpt-oss-20bo4 MiniLeader
MMLU Pro71.6%80.6%o4 Mini
LegalBench (Vals AI)70.8%79.2%o4 Mini
CaseLaw (Vals AI)43.8%Not measuredOnly gpt-oss-20b measured
CorpFin (Vals AI)53.1%59.0%o4 Mini
TaxEval (Vals AI)63.7%74.8%o4 Mini
MortgageTax (Vals AI)Not measured64.8%Only o4 Mini measured
MedQA (Vals AI)82.9%96.0%o4 Mini
MedCode (Vals AI)Not measured33.8%Only o4 Mini measured
MMLU Pro (Artificial Analysis run)74.8%83.2%o4 Mini
SimpleQA VerifiedNot measured19.6%Only o4 Mini measured
GeoBenchNot measured64.0%Only o4 Mini measured
LMArena Text: science12961354o4 Mini
LMArena Text: medicine and healthcare13101361o4 Mini
LMArena Text: legal and government12801350o4 Mini
LMArena Text: business and finance12841325o4 Mini
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index02
Web design benchmarks for gpt-oss-20b and o4 Mini
Benchmarkgpt-oss-20bo4 MiniLeader
Design Arena: websites853985o4 Mini
Design Arena: UI componentsNot measured983Only o4 Mini measured
Design Arena: game devNot measured1003Only o4 Mini measured
Design Arena: data viz933990o4 Mini
Design Arena: 3DNot measured854Only o4 Mini measured
Design Arena: all code categoriesNot measured976Only o4 Mini measured
Neither model has a result on the other 3 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index020
General benchmarks for gpt-oss-20b and o4 Mini
Benchmarkgpt-oss-20bo4 MiniLeader
SAGE (Vals AI)Not measured41.1%Only o4 Mini measured
MedScribe (Vals AI)Not measured69.1%Only o4 Mini measured
IFBench65.1%68.7%o4 Mini
Long context reasoning (AA-LCR)34.7%61.0%o4 Mini
DTBench68.0%77.6%o4 Mini
LMCA14.5%26.5%o4 Mini
Fiction.LiveBenchNot measured77.8%Only o4 Mini measured
Creative writing (Lech Mazur)Not measured75.0%Only o4 Mini measured
LMArena Text12881353o4 Mini
LMArena Text: instruction following12361320o4 Mini
LMArena Text: creative writing12011294o4 Mini
LMArena VisionNot measured1194Only o4 Mini measured
LMArena Text: English13031367o4 Mini
LMArena Text: non-English12691337o4 Mini
LMArena Text: Chinese13151354o4 Mini
LMArena Text: German12551336o4 Mini
LMArena Text: Japanese12441308o4 Mini
LMArena Text: Korean12361312o4 Mini
LMArena Text: FrenchNot measured1364Only o4 Mini measured
LMArena Text: Spanish12671346o4 Mini
LMArena Text: Russian12781334o4 Mini
LMArena Text: Polish12521358o4 Mini
LMArena Text: multi-turn12681350o4 Mini
LMArena Text: longer queries12501315o4 Mini
LMArena Text: writing and language12381316o4 Mini
LMArena Text: entertainment and media12161308o4 Mini
LMArena Vision: EnglishNot measured1200Only o4 Mini measured
LMArena Vision: ChineseNot measured1218Only o4 Mini measured
LMArena Vision: reading textNot measured1197Only o4 Mini measured
LMArena Vision: humorNot measured1199Only o4 Mini measured
LMArena Vision: captioningNot measured1204Only o4 Mini measured
LMArena Vision: recognizing thingsNot measured1218Only o4 Mini measured
LMArena Vision: creative writingNot measured1166Only o4 Mini measured
Neither model has a result on the other 13 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for gpt-oss-20b and o4 Mini
Benchmarkgpt-oss-20bo4 MiniLeader
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

gpt-oss-20b$0.0001Fits in one request
o4 Mini$0.0033Fits in one request

gpt-oss-20b costs less

Repository review

50K input + 3K output tokens

gpt-oss-20b$0.0019Fits in one request
o4 Mini$0.068Fits in one request

gpt-oss-20b costs less

Agent loop

200K input + 10K output tokens

gpt-oss-20b$0.0075Exceeds the context window
o4 Mini$0.264Exceeds 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 gpt-oss-20b and o4 Mini
SpecificationOpenAI gpt-oss-20bOpenAI o4 Mini
MakerOpenAIOpenAI
WeightsOpen weightsNo public weights listed
ReleasedAugust 5, 2025April 16, 2025
Context window131K200K
Input $/Mtok$0.03$1.10
Output $/Mtok$0.15$4.40
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it00
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is gpt-oss-20b better than o4 Mini for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. gpt-oss-20b has the edge where output tokens cost 29.3x less, and where what matters is LiveCodeBench (Vals AI) or LiveCodeBench (Artificial Analysis run), where it leads.

Which is cheaper, gpt-oss-20b or o4 Mini?

gpt-oss-20b costs $0.03 per million input tokens and $0.15 per million output tokens; o4 Mini costs $1.10 and $4.40. Cost per solved task is known for neither of them.

Which has the bigger context window, gpt-oss-20b or o4 Mini?

o4 Mini, with 200K tokens against 131K.

How many benchmarks is the gpt-oss-20b vs o4 Mini comparison based on?

56 benchmarks have a result for both models as of October 21, 2026. gpt-oss-20b's coding index rests on 0 independent benchmarks and o4 Mini's on 0. Where only one model has a result, the page says so instead of naming a winner.

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