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GPT-5.4 Mini vs gpt-oss-120b

GPT-5.4 Mini leads gpt-oss-120b on the Artificial Analysis Intelligence Index, 24.1 to 11.6, and gpt-oss-120b costs 9.0x less per output token ($0.50 vs $4.50 per million). Updated October 22, 2026; 55 benchmarks have a result for both.

Replace GPT-5.4 Mini Replace gpt-oss-120b
GPT-5.4 MiniOpenAI
Coding
35.8
Overall
44.0
Output $/M
$4.50
51
gpt-oss-120bOpenAI
Coding
No data
Overall
50.0
Output $/M
$0.50
3
vs boards won of 55 shared, 1 tied

GPT-5.4 Mini or gpt-oss-120b: which to pick

Only GPT-5.4 Mini has a coding score, 35.8 on the Vibe Coding Index; gpt-oss-120b has none, so the two cannot be ranked on coding.

Pick gpt-oss-120b for output tokens 9.0x cheaper ($0.50 vs $4.50 per million) and a lower cost per solved task ($0.51 against $0.70).

Model AGPT-5.4 MiniOpenAI35.8/1005 independent benchmarks$0.70 per solved taskModel Bgpt-oss-120bOpenAINot benchmarked1 independent benchmark$0.51 per solved task
Shared results
55
GPT-5.4 Mini only
34
gpt-oss-120b only
26
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
GPT-5.4 Mini 35.8 from 5 benchmarks, gpt-oss-120b not benchmarked.
Widest category
Coding, 18.3 points apart on average over 9 shared benchmarks.
Widest single gap
SWE-bench Verified (Vals AI): GPT-5.4 Mini 73.0% against gpt-oss-120b 33.6%, 39.4 points apart on a 0 to 100 scale.
Output price
GPT-5.4 Mini $4.50 against gpt-oss-120b $0.50 per million output tokens, 9.0x apart.
Context window
GPT-5.4 Mini takes 400K 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-5.4 MiniBarsgpt-oss-120bTies
Coding81
Intelligence20
Agentic work20
Reasoning81
Math301 tie
Knowledge71
General210
All shared boards5131 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index81
Coding benchmarks for GPT-5.4 Mini and gpt-oss-120b
BenchmarkGPT-5.4 Minigpt-oss-120bLeader
Aider polyglotNot measured41.8%Only gpt-oss-120b measured
SWE-bench VerifiedNot measured26.0%Only gpt-oss-120b measured
LMArena WebDev1397Not measuredOnly GPT-5.4 Mini measured
AA Coding Index56.130.4GPT-5.4 Mini
LiveCodeBench (Vals AI)81.5%83.2%gpt-oss-120b
SWE-bench Verified (Vals AI)73.0%33.6%GPT-5.4 Mini
Terminal-Bench 4 (Vals AI)2.5%Not measuredOnly GPT-5.4 Mini measured
Vibe Code Bench (Vals AI)48.0%Not measuredOnly GPT-5.4 Mini measured
Code migration (Vals AI)12.9%Not measuredOnly GPT-5.4 Mini measured
ProgramBench (Vals AI)0.0%Not measuredOnly GPT-5.4 Mini measured
Terminal-Bench 2.1 (Vals AI)54.7%Not measuredOnly GPT-5.4 Mini measured
LiveCodeBench (Artificial Analysis run)Not measured87.8%Only gpt-oss-120b measured
SciCode52.1%34.0%GPT-5.4 Mini
Terminal-Bench Hard (Artificial Analysis run)52.3%23.5%GPT-5.4 Mini
Terminal-BenchNot measured18.7%Only gpt-oss-120b measured
FrontierCode27.0%Not measuredOnly GPT-5.4 Mini measured
WeirdML60.3%48.2%GPT-5.4 Mini
ALE-Bench1188.6575.6GPT-5.4 Mini
LMArena Text: coding14381379GPT-5.4 Mini
LMArena Text: software and IT14361387GPT-5.4 Mini
LMArena WebDev: React1386Not measuredOnly GPT-5.4 Mini measured
LMArena WebDev: HTML1419Not measuredOnly GPT-5.4 Mini measured
SciCodeNot measured7.7%Only gpt-oss-120b measured
Neither model has a result on the other 16 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-5.4 Mini and gpt-oss-120b
BenchmarkGPT-5.4 Minigpt-oss-120bLeader
AA Intelligence Index24.111.6GPT-5.4 Mini
Epoch Capabilities Index148.7139.8GPT-5.4 Mini
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
Agentic work benchmarks for GPT-5.4 Mini and gpt-oss-120b
BenchmarkGPT-5.4 Minigpt-oss-120bLeader
AA Agentic Index17.93.7GPT-5.4 Mini
Finance Agent (Vals AI)45.4%Not measuredOnly GPT-5.4 Mini measured
Tax Agent Bench (Vals AI)8.8%Not measuredOnly GPT-5.4 Mini measured
Legal Research Bench (Vals AI)12.5%Not measuredOnly GPT-5.4 Mini measured
Excel Modeling Benchmark (Vals AI)45.4%Not measuredOnly GPT-5.4 Mini measured
τ²-Bench Telecom83.3%65.8%GPT-5.4 Mini
APEX-AgentsNot measured4.4%Only gpt-oss-120b measured
METR time horizonsNot measured56.6%Only gpt-oss-120b measured
DeepResearch Bench36.3%Not measuredOnly GPT-5.4 Mini 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 30 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index81
Reasoning benchmarks for GPT-5.4 Mini and gpt-oss-120b
BenchmarkGPT-5.4 Minigpt-oss-120bLeader
GPQA Diamond83.1%78.5%GPT-5.4 Mini
MMMU Pro (Vals AI)79.3%Not measuredOnly GPT-5.4 Mini measured
GPQA Diamond (Artificial Analysis run)87.5%78.2%GPT-5.4 Mini
Humanity's Last Exam (Artificial Analysis run)28.1%19.6%GPT-5.4 Mini
GPQA Diamond (Epoch AI run)86.9%75.8%GPT-5.4 Mini
ARC-AGI63.7%Not measuredOnly GPT-5.4 Mini measured
ARC-AGI-218.9%Not measuredOnly GPT-5.4 Mini measured
SimpleBenchNot measured22.1%Only gpt-oss-120b measured
Chess puzzles23.0%Not measuredOnly GPT-5.4 Mini measured
Mystery game puzzles11.0%2.0%GPT-5.4 Mini
LMArena Text: hard prompts14241364GPT-5.4 Mini
LMArena Text: expert14351356GPT-5.4 Mini
LMArena Text: hard prompts in English14201368GPT-5.4 Mini
LMArena Vision: diagrams1266Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: homework1285Not measuredOnly GPT-5.4 Mini measured
Kagi LLM Benchmark37.9%58.6%gpt-oss-120b
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for GPT-5.4 Mini and gpt-oss-120b
BenchmarkGPT-5.4 Minigpt-oss-120bLeader
AIME95.6%92.6%GPT-5.4 Mini
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 AIME88.9%88.9%Tie
FrontierMath, tiers 1 to 351.2%Not measuredOnly GPT-5.4 Mini measured
FrontierMath, tier 49.8%Not measuredOnly GPT-5.4 Mini measured
ProofBench21.0%Not measuredOnly GPT-5.4 Mini measured
LMArena Text: math14181389GPT-5.4 Mini
LMArena Text: mathematical work14291386GPT-5.4 Mini
Neither model has a result on the other 2 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index71
Knowledge benchmarks for GPT-5.4 Mini and gpt-oss-120b
BenchmarkGPT-5.4 Minigpt-oss-120bLeader
MMLU Pro84.5%79.2%GPT-5.4 Mini
LegalBench (Vals AI)Not measured75.9%Only gpt-oss-120b measured
CaseLaw (Vals AI)51.7%48.8%GPT-5.4 Mini
CorpFin (Vals AI)60.9%58.2%GPT-5.4 Mini
TaxEval (Vals AI)71.2%71.6%gpt-oss-120b
MortgageTax (Vals AI)63.5%Not measuredOnly GPT-5.4 Mini 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 Verified29.4%Not measuredOnly GPT-5.4 Mini measured
LMArena Text: science14171382GPT-5.4 Mini
LMArena Text: medicine and healthcare13951388GPT-5.4 Mini
LMArena Text: legal and government14141355GPT-5.4 Mini
LMArena Text: business and finance14181359GPT-5.4 Mini
Neither model has a result on the other 5 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared
Web design benchmarks for GPT-5.4 Mini and gpt-oss-120b
BenchmarkGPT-5.4 Minigpt-oss-120bLeader
Design Arena: websitesNot measured967Only gpt-oss-120b measured
Design Arena: UI componentsNot measured924Only gpt-oss-120b measured
Design Arena: game devNot measured992Only 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 index210
General benchmarks for GPT-5.4 Mini and gpt-oss-120b
BenchmarkGPT-5.4 Minigpt-oss-120bLeader
SAGE (Vals AI)50.8%Not measuredOnly GPT-5.4 Mini measured
Vals Multimodal Index54.2%Not measuredOnly GPT-5.4 Mini measured
IFBench73.3%69.0%GPT-5.4 Mini
Long context reasoning (AA-LCR)77.0%52.0%GPT-5.4 Mini
DTBench80.0%76.3%GPT-5.4 Mini
LMCA40.8%22.1%GPT-5.4 Mini
Fiction.LiveBenchNot measured44.4%Only gpt-oss-120b measured
Creative writing (Lech Mazur)Not measured77.1%Only gpt-oss-120b measured
Surface Evolver BenchNot measured25.0%Only gpt-oss-120b measured
LMArena Text14121366GPT-5.4 Mini
LMArena Text: instruction following14051318GPT-5.4 Mini
LMArena Text: creative writing13701274GPT-5.4 Mini
LMArena Vision1245Not measuredOnly GPT-5.4 Mini measured
LMArena Text: English14121375GPT-5.4 Mini
LMArena Text: non-English14051351GPT-5.4 Mini
LMArena Text: Chinese14461385GPT-5.4 Mini
LMArena Text: German14081353GPT-5.4 Mini
LMArena Text: Japanese13751331GPT-5.4 Mini
LMArena Text: Korean13701282GPT-5.4 Mini
LMArena Text: French14411370GPT-5.4 Mini
LMArena Text: Spanish14051389GPT-5.4 Mini
LMArena Text: Russian14171343GPT-5.4 Mini
LMArena Text: Polish14151353GPT-5.4 Mini
LMArena Text: multi-turn14291340GPT-5.4 Mini
LMArena Text: longer queries14081319GPT-5.4 Mini
LMArena Text: writing and language13931306GPT-5.4 Mini
LMArena Text: entertainment and media13731292GPT-5.4 Mini
LMArena Vision: English1244Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: Chinese1286Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: reading text1253Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: humor1235Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: recognizing things1218Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: creative writing1222Not measuredOnly GPT-5.4 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-5.4 Mini and gpt-oss-120b
BenchmarkGPT-5.4 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-5.4 Mini$0.0030Fits in one request
gpt-oss-120b$0.0003Fits in one request

gpt-oss-120b costs less

Repository review

50K input + 3K output tokens

GPT-5.4 Mini$0.051Fits in one request
gpt-oss-120b$0.0065Fits in one request

gpt-oss-120b costs less

Agent loop

200K input + 10K output tokens

GPT-5.4 Mini$0.195Fits in one request
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-5.4 Mini and gpt-oss-120b
SpecificationOpenAI GPT-5.4 MiniOpenAI gpt-oss-120b
MakerOpenAIOpenAI
WeightsNo public weights listedOpen weights
ReleasedMarch 17, 2026August 5, 2025
Context window400K131K
Input $/Mtok$0.75$0.10
Output $/Mtok$4.50$0.50
Coding index35.8Not benchmarked
Independent measurements behind it51
Cost per solved task$0.70$0.51
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.4 Mini better than gpt-oss-120b for coding?

Only GPT-5.4 Mini has a coding score, 35.8 on the Vibe Coding Index; gpt-oss-120b has none, so the two cannot be ranked on coding. Pick gpt-oss-120b for output tokens 9.0x cheaper ($0.50 vs $4.50 per million) and a lower cost per solved task ($0.51 against $0.70).

Which is cheaper, GPT-5.4 Mini or gpt-oss-120b?

GPT-5.4 Mini costs $0.75 per million input tokens and $4.50 per million output tokens; gpt-oss-120b costs $0.10 and $0.50. Per solved SWE-bench Verified task, GPT-5.4 Mini costs $0.70 and gpt-oss-120b $0.51.

Which has the bigger context window, GPT-5.4 Mini or gpt-oss-120b?

GPT-5.4 Mini, with 400K tokens against 131K.

How many benchmarks is the GPT-5.4 Mini vs gpt-oss-120b comparison based on?

55 benchmarks have a result for both models as of October 22, 2026. GPT-5.4 Mini's coding index rests on 5 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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