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GPT-5 vs gpt-oss-120b

GPT-5 leads gpt-oss-120b on the Artificial Analysis Intelligence Index, 23.0 to 11.6, and gpt-oss-120b costs 20.0x less per output token ($0.50 vs $10.00 per million). Updated October 21, 2026; 76 benchmarks have a result for both.

Replace GPT-5 Replace gpt-oss-120b
GPT-5OpenAI
Coding
38.8
Overall
51.5
Output $/M
$10.00
74
gpt-oss-120bOpenAI
Coding
No data
Overall
50.0
Output $/M
$0.50
2
vs boards won of 76 shared

GPT-5 or gpt-oss-120b: which to pick

Only GPT-5 has a coding score, 38.8 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 20.0x cheaper ($0.50 vs $10.00 per million) and work measured by LiveCodeBench (Artificial Analysis run) or SciCode, where it leads.

Model AGPT-5OpenAI38.8/1003 independent benchmarks$0.39 per solved taskModel Bgpt-oss-120bOpenAINot benchmarked1 independent benchmark$0.51 per solved task
Shared results
76
GPT-5 only
37
gpt-oss-120b only
5
Like-for-like categories
8 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 38.8 from 3 benchmarks, gpt-oss-120b not benchmarked.
Widest category
Web design, 26.2 points apart on average over 6 shared benchmarks.
Widest single gap
Fiction.LiveBench: GPT-5 97.2% against gpt-oss-120b 44.4%, 52.8 points apart on a 0 to 100 scale.
Output price
GPT-5 $10.00 against gpt-oss-120b $0.50 per million output tokens, 20.0x apart.
Context window
GPT-5 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-5Barsgpt-oss-120bTies
Coding112
Intelligence20
Agentic work30
Reasoning100
Math80
Knowledge110
Web design60
General230
All shared boards742
CodingLike-for-likeSix of these boards feed the Vibe Coding Index112
Coding benchmarks for GPT-5 and gpt-oss-120b
BenchmarkGPT-5gpt-oss-120bLeader
Aider polyglot88.0%41.8%GPT-5
SWE-bench Verified74.4%26.0%GPT-5
LMArena WebDev1418Not measuredOnly GPT-5 measured
AA Coding Index37.830.4GPT-5
LiveCodeBench (Vals AI)85.9%83.2%GPT-5
SWE-bench Verified (Vals AI)69.0%33.6%GPT-5
Vibe Code Bench (Vals AI)20.1%Not measuredOnly GPT-5 measured
LiveCodeBench (Artificial Analysis run)84.6%87.8%gpt-oss-120b
SciCodeNot measured34.0%Only gpt-oss-120b measured
Terminal-Bench Hard (Artificial Analysis run)37.9%23.5%GPT-5
Terminal-Bench49.6%18.7%GPT-5
GSO-Bench6.9%Not measuredOnly GPT-5 measured
WeirdML60.7%48.2%GPT-5
ALE-Bench807.6575.6GPT-5
LMArena Text: coding14361379GPT-5
LMArena Text: software and IT14201387GPT-5
LMArena WebDev: HTML1427Not measuredOnly GPT-5 measured
SciCode0.0%7.7%gpt-oss-120b
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-5 and gpt-oss-120b
BenchmarkGPT-5gpt-oss-120bLeader
AA Intelligence Index23.011.6GPT-5
Epoch Capabilities Index150.0139.8GPT-5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index30
Agentic work benchmarks for GPT-5 and gpt-oss-120b
BenchmarkGPT-5gpt-oss-120bLeader
AA Agentic IndexNot measured3.7Only gpt-oss-120b measured
τ²-Bench Telecom86.5%65.8%GPT-5
APEX-AgentsNot measured4.4%Only gpt-oss-120b measured
METR time horizons69.6%56.6%GPT-5
Remote Labor Index1.7%Not measuredOnly GPT-5 measured
GDPval34.8%Not measuredOnly GPT-5 measured
BALROG32.8%Not measuredOnly GPT-5 measured
DeepResearch Bench49.6%Not measuredOnly GPT-5 measured
Vending-Bench 2Not measured-$22Only gpt-oss-120b measured
BrowseComp-Plus80.0%67.0%GPT-5
Neither model has a result on the other 31 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index100
Reasoning benchmarks for GPT-5 and gpt-oss-120b
BenchmarkGPT-5gpt-oss-120bLeader
GPQA Diamond85.6%78.5%GPT-5
MMMU Pro (Vals AI)81.5%Not measuredOnly GPT-5 measured
GPQA Diamond (Artificial Analysis run)85.4%78.2%GPT-5
Humanity's Last Exam (Artificial Analysis run)28.5%19.6%GPT-5
GPQA Diamond (Epoch AI run)86.2%75.8%GPT-5
ARC-AGI65.7%Not measuredOnly GPT-5 measured
ARC-AGI-29.9%Not measuredOnly GPT-5 measured
SimpleBench56.7%22.1%GPT-5
Chess puzzles36.0%Not measuredOnly GPT-5 measured
Mystery game puzzles23.0%2.0%GPT-5
EBR-bench12.7%Not measuredOnly GPT-5 measured
VPCT66.0%Not measuredOnly GPT-5 measured
LMArena Text: hard prompts14151364GPT-5
LMArena Text: expert14191356GPT-5
LMArena Text: hard prompts in English14191368GPT-5
LMArena Vision: diagrams1252Not measuredOnly GPT-5 measured
LMArena Vision: homework1278Not measuredOnly GPT-5 measured
Kagi LLM Benchmark72.7%58.6%GPT-5
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index80
Math benchmarks for GPT-5 and gpt-oss-120b
BenchmarkGPT-5gpt-oss-120bLeader
AIME93.4%92.6%GPT-5
MATH 500 (Vals AI)96.0%94.8%GPT-5
MGSM (Vals AI)92.8%92.0%GPT-5
AA Math Index94.393.4GPT-5
AIME 2025 (Artificial Analysis run)94.3%93.4%GPT-5
OTIS Mock AIME91.4%88.9%GPT-5
FrontierMath, tiers 1 to 355.4%Not measuredOnly GPT-5 measured
FrontierMath, tier 422.0%Not measuredOnly GPT-5 measured
ProofBench18.0%Not measuredOnly GPT-5 measured
MATH level 598.1%Not measuredOnly GPT-5 measured
LMArena Text: math14071389GPT-5
LMArena Text: mathematical work14051386GPT-5
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for GPT-5 and gpt-oss-120b
BenchmarkGPT-5gpt-oss-120bLeader
MMLU Pro86.5%79.2%GPT-5
LegalBench (Vals AI)86.0%75.9%GPT-5
CaseLaw (Vals AI)66.5%48.8%GPT-5
CorpFin (Vals AI)61.1%58.2%GPT-5
TaxEval (Vals AI)73.4%71.6%GPT-5
MortgageTax (Vals AI)65.5%Not measuredOnly GPT-5 measured
MedQA (Vals AI)96.3%91.4%GPT-5
MedCode (Vals AI)49.6%Not measuredOnly GPT-5 measured
MMLU Pro (Artificial Analysis run)87.1%80.8%GPT-5
SimpleQA Verified50.1%Not measuredOnly GPT-5 measured
GeoBench81.0%Not measuredOnly GPT-5 measured
LMArena Text: science14161382GPT-5
LMArena Text: medicine and healthcare14131388GPT-5
LMArena Text: legal and government14311355GPT-5
LMArena Text: business and finance14001359GPT-5
FACTS Benchmark Suite56.5%Not measuredOnly GPT-5 measured
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for GPT-5 and gpt-oss-120b
BenchmarkGPT-5gpt-oss-120bLeader
Design Arena: websites1184968GPT-5
Design Arena: UI components1180927GPT-5
Design Arena: game dev1185992GPT-5
Design Arena: data viz1221987GPT-5
Design Arena: 3D1056901GPT-5
Design Arena: all code categories1168963GPT-5
Design Arena: SVG1189Not measuredOnly GPT-5 measured
Design Arena: ASCII art1141Not measuredOnly GPT-5 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index230
General benchmarks for GPT-5 and gpt-oss-120b
BenchmarkGPT-5gpt-oss-120bLeader
SAGE (Vals AI)43.7%Not measuredOnly GPT-5 measured
MedScribe (Vals AI)83.7%Not measuredOnly GPT-5 measured
IFBench73.1%69.0%GPT-5
Long context reasoning (AA-LCR)78.2%52.0%GPT-5
DTBench90.7%76.3%GPT-5
LMCA40.0%22.1%GPT-5
Fiction.LiveBench97.2%44.4%GPT-5
Creative writing (Lech Mazur)86.0%77.1%GPT-5
Surface Evolver BenchNot measured25.0%Only gpt-oss-120b measured
LMArena Text14061366GPT-5
LMArena Text: instruction following13881318GPT-5
LMArena Text: creative writing13651274GPT-5
LMArena Vision1232Not measuredOnly GPT-5 measured
LMArena Text: English14091375GPT-5
LMArena Text: non-English13971351GPT-5
LMArena Text: Chinese14221385GPT-5
LMArena Text: German14161353GPT-5
LMArena Text: Japanese14091331GPT-5
LMArena Text: Korean13601282GPT-5
LMArena Text: French14091370GPT-5
LMArena Text: Spanish13991389GPT-5
LMArena Text: Russian14071343GPT-5
LMArena Text: Polish14311353GPT-5
LMArena Text: multi-turn14261340GPT-5
LMArena Text: longer queries13991319GPT-5
LMArena Text: writing and language13841306GPT-5
LMArena Text: entertainment and media13791292GPT-5
LMArena Vision: English1231Not measuredOnly GPT-5 measured
LMArena Vision: Chinese1267Not measuredOnly GPT-5 measured
LMArena Vision: reading text1246Not measuredOnly GPT-5 measured
LMArena Vision: humor1219Not measuredOnly GPT-5 measured
LMArena Vision: captioning1212Not measuredOnly GPT-5 measured
LMArena Vision: recognizing things1263Not measuredOnly GPT-5 measured
LMArena Vision: creative writing1210Not measuredOnly GPT-5 measured
Neither model has a result on the other 12 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5 and gpt-oss-120b
BenchmarkGPT-5gpt-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$0.0063Fits 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$0.092Fits 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$0.350Fits 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 and gpt-oss-120b
SpecificationOpenAI GPT-5OpenAI gpt-oss-120b
MakerOpenAIOpenAI
WeightsNo public weights listedOpen weights
ReleasedAugust 7, 2025August 5, 2025
Context window400K131K
Input $/Mtok$1.25$0.10
Output $/Mtok$10.00$0.50
Coding index38.8Not benchmarked
Independent measurements behind it31
Cost per solved task$0.39$0.51
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5 better than gpt-oss-120b for coding?

Only GPT-5 has a coding score, 38.8 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 20.0x cheaper ($0.50 vs $10.00 per million) and work measured by LiveCodeBench (Artificial Analysis run) or SciCode, where it leads.

Which is cheaper, GPT-5 or gpt-oss-120b?

GPT-5 costs $1.25 per million input tokens and $10.00 per million output tokens; gpt-oss-120b costs $0.10 and $0.50. Per solved SWE-bench Verified task, GPT-5 costs $0.39 and gpt-oss-120b $0.51.

Which has the bigger context window, GPT-5 or gpt-oss-120b?

GPT-5, with 400K tokens against 131K.

How many benchmarks is the GPT-5 vs gpt-oss-120b comparison based on?

76 benchmarks have a result for both models as of October 21, 2026. GPT-5's coding index rests on 3 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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