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GPT-4o-mini (2024-07-18) vs gpt-oss-120b

gpt-oss-120b costs 1.2x less per output token than GPT-4o-mini (2024-07-18) ($0.50 vs $0.60 per million). Updated October 22, 2026; 35 benchmarks have a result for both.

Replace GPT-4o-mini (2024-07-18) Replace gpt-oss-120b
GPT-4o-mini (2024-07-18)OpenAI
Coding
No data
Overall
No data
Output $/M
$0.60
1
gpt-oss-120bOpenAI
Coding
No data
Overall
50.0
Output $/M
$0.50
34
vs boards won of 35 shared

GPT-4o-mini (2024-07-18) or gpt-oss-120b: which to pick

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

Pick GPT-4o-mini (2024-07-18) for work measured by Aider polyglot or WeirdML, where it leads.

Model AGPT-4o-mini (2024-07-18)OpenAINot benchmarkedNo coding benchmarkNo cost per solved taskModel Bgpt-oss-120bOpenAINot benchmarked1 independent benchmark$0.51 per solved task
Shared results
35
GPT-4o-mini (2024-07-18) only
11
gpt-oss-120b only
50
Like-for-like categories
5 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
GPT-4o-mini (2024-07-18) not benchmarked, gpt-oss-120b not benchmarked.
Widest category
Math, 40.4 points apart on average over 3 shared benchmarks.
Widest single gap
OTIS Mock AIME: GPT-4o-mini (2024-07-18) 6.9% against gpt-oss-120b 88.9%, 81.9 points apart on a 0 to 100 scale.
Output price
GPT-4o-mini (2024-07-18) $0.60 against gpt-oss-120b $0.50 per million output tokens, 1.2x apart.
Context window
GPT-4o-mini (2024-07-18) takes 128K 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-4o-mini (2024-07-18)Barsgpt-oss-120bTies
Coding04
Reasoning15
Math03
Knowledge04
General018
All shared boards134
CodingLike-for-likeSix of these boards feed the Vibe Coding Index04
Coding benchmarks for GPT-4o-mini (2024-07-18) and gpt-oss-120b
BenchmarkGPT-4o-mini (2024-07-18)gpt-oss-120bLeader
Aider polyglot3.6%41.8%gpt-oss-120b
SWE-bench VerifiedNot measured26.0%Only gpt-oss-120b measured
AA Coding IndexNot measured30.4Only gpt-oss-120b measured
LiveCodeBench (Vals AI)Not measured83.2%Only gpt-oss-120b measured
SWE-bench Verified (Vals AI)Not measured33.6%Only gpt-oss-120b measured
LiveCodeBench (Artificial Analysis run)Not measured87.8%Only gpt-oss-120b measured
SciCodeNot measured34.0%Only gpt-oss-120b measured
Terminal-Bench Hard (Artificial Analysis run)Not measured23.5%Only gpt-oss-120b measured
Terminal-BenchNot measured18.7%Only gpt-oss-120b measured
WeirdML11.8%48.2%gpt-oss-120b
ALE-BenchNot measured575.6Only gpt-oss-120b measured
LMArena Text: coding12901379gpt-oss-120b
LMArena Text: software and IT12911387gpt-oss-120b
SciCodeNot measured7.7%Only gpt-oss-120b measured
Neither model has a result on the other 29 boards here
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
Intelligence benchmarks for GPT-4o-mini (2024-07-18) and gpt-oss-120b
BenchmarkGPT-4o-mini (2024-07-18)gpt-oss-120bLeader
AA Intelligence IndexNot measured11.6Only gpt-oss-120b measured
Epoch Capabilities IndexNot measured139.8Only gpt-oss-120b measured
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index7 boards, none shared
Agentic work benchmarks for GPT-4o-mini (2024-07-18) and gpt-oss-120b
BenchmarkGPT-4o-mini (2024-07-18)gpt-oss-120bLeader
AA Agentic IndexNot measured3.7Only gpt-oss-120b measured
τ²-Bench TelecomNot measured65.8%Only gpt-oss-120b measured
APEX-AgentsNot measured4.4%Only gpt-oss-120b measured
METR time horizonsNot measured56.6%Only gpt-oss-120b measured
BALROG17.4%Not measuredOnly GPT-4o-mini (2024-07-18) measured
Vending-Bench 2Not measured-$22Only gpt-oss-120b measured
BrowseComp-PlusNot measured67.0%Only gpt-oss-120b measured
Neither model has a result on the other 35 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index15
Reasoning benchmarks for GPT-4o-mini (2024-07-18) and gpt-oss-120b
BenchmarkGPT-4o-mini (2024-07-18)gpt-oss-120bLeader
GPQA DiamondNot measured78.5%Only gpt-oss-120b measured
GPQA Diamond (Artificial Analysis run)Not measured78.2%Only gpt-oss-120b measured
Humanity's Last Exam (Artificial Analysis run)Not measured19.6%Only gpt-oss-120b measured
GPQA Diamond (Epoch AI run)37.7%75.8%gpt-oss-120b
SimpleBench10.7%22.1%gpt-oss-120b
Chess puzzles3.0%Not measuredOnly GPT-4o-mini (2024-07-18) measured
Mystery game puzzles12.0%2.0%GPT-4o-mini (2024-07-18)
VPCT34.0%Not measuredOnly GPT-4o-mini (2024-07-18) measured
LMArena Text: hard prompts12671364gpt-oss-120b
LMArena Text: expert12341356gpt-oss-120b
LMArena Text: hard prompts in English12781368gpt-oss-120b
Kagi LLM BenchmarkNot measured58.6%Only gpt-oss-120b measured
Neither model has a result on the other 11 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index03
Math benchmarks for GPT-4o-mini (2024-07-18) and gpt-oss-120b
BenchmarkGPT-4o-mini (2024-07-18)gpt-oss-120bLeader
AIMENot measured92.6%Only gpt-oss-120b measured
MATH 500 (Vals AI)Not measured94.8%Only gpt-oss-120b measured
MGSM (Vals AI)Not measured92.0%Only gpt-oss-120b measured
AA Math IndexNot measured93.4Only gpt-oss-120b measured
AIME 2025 (Artificial Analysis run)Not measured93.4%Only gpt-oss-120b measured
OTIS Mock AIME6.9%88.9%gpt-oss-120b
FrontierMath, tiers 1 to 30.7%Not measuredOnly GPT-4o-mini (2024-07-18) measured
MATH level 552.6%Not measuredOnly GPT-4o-mini (2024-07-18) measured
LMArena Text: math12671389gpt-oss-120b
LMArena Text: mathematical work12711386gpt-oss-120b
MathArenaNot measured15.1%Only gpt-oss-120b measured
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index04
Knowledge benchmarks for GPT-4o-mini (2024-07-18) and gpt-oss-120b
BenchmarkGPT-4o-mini (2024-07-18)gpt-oss-120bLeader
MMLU ProNot measured79.2%Only gpt-oss-120b measured
LegalBench (Vals AI)Not measured75.9%Only gpt-oss-120b measured
CaseLaw (Vals AI)Not measured48.8%Only gpt-oss-120b measured
CorpFin (Vals AI)Not measured58.2%Only gpt-oss-120b measured
TaxEval (Vals AI)Not measured71.6%Only gpt-oss-120b measured
MedQA (Vals AI)Not measured91.4%Only gpt-oss-120b measured
MMLU Pro (Artificial Analysis run)Not measured80.8%Only gpt-oss-120b measured
SimpleQA Verified8.3%Not measuredOnly GPT-4o-mini (2024-07-18) measured
MMLU76.7%Not measuredOnly GPT-4o-mini (2024-07-18) measured
GeoBench64.0%Not measuredOnly GPT-4o-mini (2024-07-18) measured
LMArena Text: science12861382gpt-oss-120b
LMArena Text: medicine and healthcare12821388gpt-oss-120b
LMArena Text: legal and government13051355gpt-oss-120b
LMArena Text: business and finance12651359gpt-oss-120b
PRBench FinanceNot measured43.8%Only gpt-oss-120b measured
PRBench LegalNot measured40.2%Only gpt-oss-120b measured
Neither model has a result on the other 4 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared
Web design benchmarks for GPT-4o-mini (2024-07-18) and gpt-oss-120b
BenchmarkGPT-4o-mini (2024-07-18)gpt-oss-120bLeader
Design Arena: websitesNot measured968Only gpt-oss-120b measured
Design Arena: UI componentsNot measured924Only gpt-oss-120b measured
Design Arena: game devNot measured991Only gpt-oss-120b measured
Design Arena: data vizNot measured987Only gpt-oss-120b measured
Design Arena: 3DNot measured901Only gpt-oss-120b measured
Design Arena: all code categoriesNot measured962Only gpt-oss-120b measured
Neither model has a result on the other 3 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index018
General benchmarks for GPT-4o-mini (2024-07-18) and gpt-oss-120b
BenchmarkGPT-4o-mini (2024-07-18)gpt-oss-120bLeader
IFBenchNot measured69.0%Only gpt-oss-120b measured
Long context reasoning (AA-LCR)Not measured52.0%Only gpt-oss-120b measured
DTBenchNot measured76.3%Only gpt-oss-120b measured
LMCANot measured22.1%Only gpt-oss-120b measured
Fiction.LiveBenchNot measured44.4%Only gpt-oss-120b measured
Creative writing (Lech Mazur)67.2%77.1%gpt-oss-120b
Surface Evolver BenchNot measured25.0%Only gpt-oss-120b measured
LMArena Text12861366gpt-oss-120b
LMArena Text: instruction following12581318gpt-oss-120b
LMArena Text: creative writing12681274gpt-oss-120b
LMArena Vision1066Not measuredOnly GPT-4o-mini (2024-07-18) measured
LMArena Text: English13011375gpt-oss-120b
LMArena Text: non-English12661351gpt-oss-120b
LMArena Text: Chinese12651385gpt-oss-120b
LMArena Text: German12721353gpt-oss-120b
LMArena Text: Japanese12161331gpt-oss-120b
LMArena Text: Korean11951282gpt-oss-120b
LMArena Text: French12971370gpt-oss-120b
LMArena Text: Spanish12761389gpt-oss-120b
LMArena Text: Russian12751343gpt-oss-120b
LMArena Text: Polish12441353gpt-oss-120b
LMArena Text: multi-turn12851340gpt-oss-120b
LMArena Text: longer queries12891319gpt-oss-120b
LMArena Text: writing and language12821306gpt-oss-120b
LMArena Text: entertainment and media12531292gpt-oss-120b
LMArena Vision: English1072Not measuredOnly GPT-4o-mini (2024-07-18) measured
LMArena Vision: Chinese1033Not measuredOnly GPT-4o-mini (2024-07-18) measured
MultiChallengeNot measured45.3%Only gpt-oss-120b measured
Neither model has a result on the other 20 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-4o-mini (2024-07-18) and gpt-oss-120b
BenchmarkGPT-4o-mini (2024-07-18)gpt-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-4o-mini (2024-07-18)$0.0004Fits in one request
gpt-oss-120b$0.0003Fits in one request

gpt-oss-120b costs less

Repository review

50K input + 3K output tokens

GPT-4o-mini (2024-07-18)$0.0093Fits in one request
gpt-oss-120b$0.0065Fits in one request

gpt-oss-120b costs less

Agent loop

200K input + 10K output tokens

GPT-4o-mini (2024-07-18)$0.036Exceeds the context window
gpt-oss-120b$0.025Exceeds 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-4o-mini (2024-07-18) and gpt-oss-120b
SpecificationOpenAI GPT-4o-mini (2024-07-18)OpenAI gpt-oss-120b
MakerOpenAIOpenAI
WeightsNo public weights listedOpen weights
ReleasedJuly 18, 2024August 5, 2025
Context window128K131K
Input $/Mtok$0.15$0.10
Output $/Mtok$0.60$0.50
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it01
Cost per solved taskNot computable$0.51
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-4o-mini (2024-07-18) better than gpt-oss-120b for coding?

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GPT-4o-mini (2024-07-18) for work measured by Aider polyglot or WeirdML, where it leads.

Which is cheaper, GPT-4o-mini (2024-07-18) or gpt-oss-120b?

GPT-4o-mini (2024-07-18) costs $0.15 per million input tokens and $0.60 per million output tokens; gpt-oss-120b costs $0.10 and $0.50. Cost per solved task is known for gpt-oss-120b only.

Which has the bigger context window, GPT-4o-mini (2024-07-18) or gpt-oss-120b?

gpt-oss-120b, with 131K tokens against 128K.

How many benchmarks is the GPT-4o-mini (2024-07-18) vs gpt-oss-120b comparison based on?

35 benchmarks have a result for both models as of October 22, 2026. GPT-4o-mini (2024-07-18)'s coding index rests on 0 independent benchmarks and gpt-oss-120b's on 1. Where only one model has a result, the page says so instead of naming a winner.

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