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GPT-4.1 Mini vs gpt-oss-120b

Updated October 21, 2026. 66 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-4.1 Mini Replace gpt-oss-120b
GPT-4.1 MiniOpenAI
Coding
28.5
Overall
10.2
Output $/M
$1.60
15
gpt-oss-120bOpenAI
Coding
34.5
Overall
11.6
Output $/M
$0.60
50
vs boards won of 66 shared, 1 tied

Decision reading

Pick gpt-oss-120b for coding: it scores 34.5 on the Vibe Coding Index against 28.5 for GPT-4.1 Mini.

Pick GPT-4.1 Mini when the context window is larger, 1.05M against 131K tokens, or when what matters is Mystery game puzzles or LegalBench (Vals AI), where it leads.

Model AGPT-4.1 MiniOpenAI28.5/1002 independent benchmarks$1.818 per solved taskModel Bgpt-oss-120bOpenAI34.5/1002 independent benchmarks$0.51 per solved task
Shared results
66
GPT-4.1 Mini only
18
gpt-oss-120b only
12
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-4.1 Mini 28.5 from 2 benchmarks, gpt-oss-120b 34.5 from 2 benchmarks.
Widest category
Math, 25.9 points apart on average over 8 shared benchmarks.
Widest single gap
AIME 2025 (Artificial Analysis run): GPT-4.1 Mini 46.3% against gpt-oss-120b 93.4%, 47.1 points apart on a 0 to 100 scale.
Output price
GPT-4.1 Mini $1.60 against gpt-oss-120b $0.60 per million output tokens, 2.7x apart.
Context window
GPT-4.1 Mini takes 1.05M tokens, gpt-oss-120b 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
CategoryGPT-4.1 MiniBarsgpt-oss-120bTies
Coding09
Intelligence02
Agentic work01
Reasoning17
Math08
Knowledge28
Web design51
General7141 tie
All shared boards15501 tie
CodingLike-for-likeFour of these boards feed the Vibe Coding Index09
Coding benchmarks for GPT-4.1 Mini and gpt-oss-120b
BenchmarkGPT-4.1 Minigpt-oss-120bLeader
Aider polyglot32.4%41.8%gpt-oss-120b
SWE-bench Verified23.9%26.0%gpt-oss-120b
AA Coding Index20.230.4gpt-oss-120b
LiveCodeBench (Vals AI)58.2%83.2%gpt-oss-120b
SWE-bench Verified (Vals AI)Not measured33.6%Only gpt-oss-120b measured
LiveCodeBench (Artificial Analysis run)48.3%87.8%gpt-oss-120b
SciCodeNot measured34.0%Only gpt-oss-120b measured
Terminal-Bench Hard (Artificial Analysis run)7.6%23.5%gpt-oss-120b
Terminal-BenchNot measured18.7%Only gpt-oss-120b measured
WeirdML37.6%48.2%gpt-oss-120b
ALE-BenchNot measured575.6Only gpt-oss-120b measured
LMArena Text: coding13671379gpt-oss-120b
LMArena Text: software and IT13601387gpt-oss-120b
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-4.1 Mini and gpt-oss-120b
BenchmarkGPT-4.1 Minigpt-oss-120bLeader
AA Intelligence Index10.211.6gpt-oss-120b
Epoch Capabilities Index134.9139.8gpt-oss-120b
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for GPT-4.1 Mini and gpt-oss-120b
BenchmarkGPT-4.1 Minigpt-oss-120bLeader
AA Agentic IndexNot measured3.7Only gpt-oss-120b measured
τ²-Bench Telecom52.9%65.8%gpt-oss-120b
APEX-AgentsNot measured4.4%Only gpt-oss-120b measured
METR time horizonsNot measured56.6%Only gpt-oss-120b measured
Vending-Bench 2Not measured-$22Only gpt-oss-120b measured
Neither model has a result on the other 34 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index17
Reasoning benchmarks for GPT-4.1 Mini and gpt-oss-120b
BenchmarkGPT-4.1 Minigpt-oss-120bLeader
GPQA Diamond67.9%78.5%gpt-oss-120b
MMMU Pro (Vals AI)70.5%Not measuredOnly GPT-4.1 Mini measured
GPQA Diamond (Artificial Analysis run)66.4%78.2%gpt-oss-120b
Humanity's Last Exam (Artificial Analysis run)5.0%19.6%gpt-oss-120b
GPQA Diamond (Epoch AI run)65.8%75.8%gpt-oss-120b
ARC-AGI3.5%Not measuredOnly GPT-4.1 Mini measured
ARC-AGI-20.0%Not measuredOnly GPT-4.1 Mini measured
SimpleBenchNot measured22.1%Only gpt-oss-120b measured
Chess puzzles1.0%Not measuredOnly GPT-4.1 Mini measured
Mystery game puzzles7.0%2.0%GPT-4.1 Mini
LMArena Text: hard prompts13491364gpt-oss-120b
LMArena Text: expert13381356gpt-oss-120b
LMArena Text: hard prompts in English13621368gpt-oss-120b
LMArena Vision: diagrams1182Not measuredOnly GPT-4.1 Mini measured
LMArena Vision: homework1214Not measuredOnly GPT-4.1 Mini measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index08
Math benchmarks for GPT-4.1 Mini and gpt-oss-120b
BenchmarkGPT-4.1 Minigpt-oss-120bLeader
AIME49.4%92.6%gpt-oss-120b
MATH 500 (Vals AI)88.0%94.8%gpt-oss-120b
MGSM (Vals AI)87.8%92.0%gpt-oss-120b
AA Math Index46.393.4gpt-oss-120b
AIME 2025 (Artificial Analysis run)46.3%93.4%gpt-oss-120b
OTIS Mock AIME44.7%88.9%gpt-oss-120b
FrontierMath, tiers 1 to 36.7%Not measuredOnly GPT-4.1 Mini measured
MATH level 587.3%Not measuredOnly GPT-4.1 Mini measured
LMArena Text: math13431389gpt-oss-120b
LMArena Text: mathematical work13471386gpt-oss-120b
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index28
Knowledge benchmarks for GPT-4.1 Mini and gpt-oss-120b
BenchmarkGPT-4.1 Minigpt-oss-120bLeader
MMLU Pro77.2%79.2%gpt-oss-120b
LegalBench (Vals AI)78.0%75.9%GPT-4.1 Mini
CaseLaw (Vals AI)Not measured48.8%Only gpt-oss-120b measured
CorpFin (Vals AI)57.9%58.2%gpt-oss-120b
TaxEval (Vals AI)71.9%71.6%GPT-4.1 Mini
MortgageTax (Vals AI)65.5%Not measuredOnly GPT-4.1 Mini measured
MedQA (Vals AI)84.6%91.4%gpt-oss-120b
MMLU Pro (Artificial Analysis run)78.1%80.8%gpt-oss-120b
SimpleQA Verified12.7%Not measuredOnly GPT-4.1 Mini measured
LMArena Text: science13281382gpt-oss-120b
LMArena Text: medicine and healthcare13241388gpt-oss-120b
LMArena Text: legal and government13431355gpt-oss-120b
LMArena Text: business and finance13221359gpt-oss-120b
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index51
Web design benchmarks for GPT-4.1 Mini and gpt-oss-120b
BenchmarkGPT-4.1 Minigpt-oss-120bLeader
Design Arena: websites997968GPT-4.1 Mini
Design Arena: UI components961927GPT-4.1 Mini
Design Arena: game dev1071992GPT-4.1 Mini
Design Arena: data viz1034987GPT-4.1 Mini
Design Arena: 3D837901gpt-oss-120b
Design Arena: all code categories994963GPT-4.1 Mini
Neither model has a result on the other 3 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index714
General benchmarks for GPT-4.1 Mini and gpt-oss-120b
BenchmarkGPT-4.1 Minigpt-oss-120bLeader
IFBench38.3%69.0%gpt-oss-120b
Long context reasoning (AA-LCR)44.0%52.0%gpt-oss-120b
DTBench68.8%76.3%gpt-oss-120b
LMCA21.1%22.1%gpt-oss-120b
Fiction.LiveBench44.4%44.4%Tie
Creative writing (Lech Mazur)Not measured77.1%Only gpt-oss-120b measured
Surface Evolver BenchNot measured25.0%Only gpt-oss-120b measured
LMArena Text13411366gpt-oss-120b
LMArena Text: instruction following13331318GPT-4.1 Mini
LMArena Text: creative writing12991274GPT-4.1 Mini
LMArena Vision1181Not measuredOnly GPT-4.1 Mini measured
LMArena Text: English13561375gpt-oss-120b
LMArena Text: non-English13181351gpt-oss-120b
LMArena Text: Chinese13291385gpt-oss-120b
LMArena Text: German13501353gpt-oss-120b
LMArena Text: Japanese12901331gpt-oss-120b
LMArena Text: Korean12981282GPT-4.1 Mini
LMArena Text: French13581370gpt-oss-120b
LMArena Text: Spanish13191389gpt-oss-120b
LMArena Text: Russian13241343gpt-oss-120b
LMArena Text: Polish13261353gpt-oss-120b
LMArena Text: multi-turn13541340GPT-4.1 Mini
LMArena Text: longer queries13441319GPT-4.1 Mini
LMArena Text: writing and language13191306GPT-4.1 Mini
LMArena Text: entertainment and media13001292GPT-4.1 Mini
LMArena Vision: English1191Not measuredOnly GPT-4.1 Mini measured
LMArena Vision: Chinese1186Not measuredOnly GPT-4.1 Mini measured
LMArena Vision: reading text1188Not measuredOnly GPT-4.1 Mini measured
LMArena Vision: humor1182Not measuredOnly GPT-4.1 Mini measured
LMArena Vision: captioning1174Not measuredOnly GPT-4.1 Mini measured
LMArena Vision: recognizing things1187Not measuredOnly GPT-4.1 Mini measured
LMArena Vision: creative writing1182Not measuredOnly GPT-4.1 Mini measured
Neither model has a result on the other 14 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-4.1 Mini and gpt-oss-120b
BenchmarkGPT-4.1 Minigpt-oss-120bLeader
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-4.1 Mini$0.0012Fits in one request
gpt-oss-120b$0.0004Fits in one request

gpt-oss-120b costs less

Repository review

50K input + 3K output tokens

GPT-4.1 Mini$0.025Fits in one request
gpt-oss-120b$0.0093Fits in one request

gpt-oss-120b costs less

Agent loop

200K input + 10K output tokens

GPT-4.1 Mini$0.096Fits in one request
gpt-oss-120b$0.036Exceeds the context window

gpt-oss-120b 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-4.1 Mini and gpt-oss-120b
SpecificationOpenAI GPT-4.1 MiniOpenAI gpt-oss-120b
MakerOpenAIOpenAI
WeightsNo public weights listedOpen weights
ReleasedApril 14, 2025August 5, 2025
Context window1.05M131K
Input $/Mtok$0.40$0.15
Output $/Mtok$1.60$0.60
Coding index28.534.5
Independent measurements behind it22
Cost per solved task$1.818$0.51
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-4.1 Mini better than gpt-oss-120b for coding?

Pick gpt-oss-120b for coding: it scores 34.5 on the Vibe Coding Index against 28.5 for GPT-4.1 Mini. Pick GPT-4.1 Mini when the context window is larger, 1.05M against 131K tokens, or when what matters is Mystery game puzzles or LegalBench (Vals AI), where it leads.

Which is cheaper, GPT-4.1 Mini or gpt-oss-120b?

GPT-4.1 Mini costs $0.40 per million input tokens and $1.60 per million output tokens; gpt-oss-120b costs $0.15 and $0.60. Per solved SWE-bench Verified task, GPT-4.1 Mini costs $1.818 and gpt-oss-120b $0.51.

Which has the bigger context window, GPT-4.1 Mini or gpt-oss-120b?

GPT-4.1 Mini, with 1.05M tokens against 131K.

How many benchmarks is the GPT-4.1 Mini vs gpt-oss-120b comparison based on?

66 benchmarks have a result for both models as of October 21, 2026. GPT-4.1 Mini's coding index rests on 2 independent benchmarks and gpt-oss-120b's on 2. Where only one model has a result, the page says so instead of naming a winner.

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