Enter opens the highlighted result. Esc closes.

GPT-5 Nano vs gpt-oss-120b

GPT-5 Nano leads gpt-oss-120b on the Artificial Analysis Intelligence Index, 13.0 to 11.6, and GPT-5 Nano costs 1.3x less per output token ($0.40 vs $0.50 per million). Updated October 22, 2026; 65 benchmarks have a result for both.

Replace GPT-5 Nano Replace gpt-oss-120b
GPT-5 NanoOpenAI
Coding
No data
Overall
35.6
Output $/M
$0.40
13
gpt-oss-120bOpenAI
Coding
No data
Overall
50.0
Output $/M
$0.50
51
vs boards won of 65 shared, 1 tied

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

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

Pick GPT-5 Nano for output tokens 1.3x cheaper ($0.40 vs $0.50 per million) and a lower cost per solved task ($0.109 against $0.51).

Model AGPT-5 NanoOpenAINot benchmarkedNo coding benchmark$0.109 per solved taskModel Bgpt-oss-120bOpenAINot benchmarked1 independent benchmark$0.51 per solved task
Shared results
65
GPT-5 Nano only
22
gpt-oss-120b only
16
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 Nano not benchmarked, gpt-oss-120b not benchmarked.
Widest category
Agentic work, 29.2 points apart on average over 1 shared benchmark.
Widest single gap
τ²-Bench Telecom: GPT-5 Nano 36.5% against gpt-oss-120b 65.8%, 29.2 points apart on a 0 to 100 scale.
Output price
GPT-5 Nano $0.40 against gpt-oss-120b $0.50 per million output tokens, 1.3x apart.
Context window
GPT-5 Nano 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 NanoBarsgpt-oss-120bTies
Coding26
Intelligence11
Agentic work01
Reasoning27
Math08
Knowledge28
Web design60
General0201 tie
All shared boards13511 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index26
Coding benchmarks for GPT-5 Nano and gpt-oss-120b
BenchmarkGPT-5 Nanogpt-oss-120bLeader
Aider polyglotNot measured41.8%Only gpt-oss-120b measured
SWE-bench Verified34.8%26.0%GPT-5 Nano
AA Coding IndexNot measured30.4Only gpt-oss-120b measured
LiveCodeBench (Vals AI)70.2%83.2%gpt-oss-120b
SWE-bench Verified (Vals AI)Not measured33.6%Only gpt-oss-120b measured
LiveCodeBench (Artificial Analysis run)78.9%87.8%gpt-oss-120b
SciCodeNot measured34.0%Only gpt-oss-120b measured
Terminal-Bench Hard (Artificial Analysis run)17.4%23.5%gpt-oss-120b
Terminal-Bench21.8%18.7%GPT-5 Nano
WeirdML38.1%48.2%gpt-oss-120b
ALE-BenchNot measured575.6Only gpt-oss-120b measured
LMArena Text: coding13511379gpt-oss-120b
LMArena Text: software and IT13451387gpt-oss-120b
SciCodeNot measured7.7%Only gpt-oss-120b measured
Neither model has a result on the other 25 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for GPT-5 Nano and gpt-oss-120b
BenchmarkGPT-5 Nanogpt-oss-120bLeader
AA Intelligence Index13.011.6GPT-5 Nano
Epoch Capabilities Index139.2139.8gpt-oss-120b
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
Agentic work benchmarks for GPT-5 Nano and gpt-oss-120b
BenchmarkGPT-5 Nanogpt-oss-120bLeader
AA Agentic IndexNot measured3.7Only gpt-oss-120b measured
τ²-Bench Telecom36.5%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
Berkeley Function Calling Leaderboard (BFCL)51.4%Not measuredOnly GPT-5 Nano measured
BrowseComp-PlusNot measured67.0%Only 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 index27
Reasoning benchmarks for GPT-5 Nano and gpt-oss-120b
BenchmarkGPT-5 Nanogpt-oss-120bLeader
GPQA Diamond63.4%78.5%gpt-oss-120b
MMMU Pro (Vals AI)70.9%Not measuredOnly GPT-5 Nano measured
GPQA Diamond (Artificial Analysis run)67.6%78.2%gpt-oss-120b
Humanity's Last Exam (Artificial Analysis run)9.5%19.6%gpt-oss-120b
GPQA Diamond (Epoch AI run)69.4%75.8%gpt-oss-120b
ARC-AGI20.7%Not measuredOnly GPT-5 Nano measured
ARC-AGI-22.6%Not measuredOnly GPT-5 Nano measured
SimpleBenchNot measured22.1%Only gpt-oss-120b measured
Chess puzzles22.0%Not measuredOnly GPT-5 Nano measured
Mystery game puzzles9.0%2.0%GPT-5 Nano
VPCT37.2%Not measuredOnly GPT-5 Nano measured
LMArena Text: hard prompts13281364gpt-oss-120b
LMArena Text: expert13211356gpt-oss-120b
LMArena Text: hard prompts in English13381368gpt-oss-120b
LMArena Vision: diagrams1141Not measuredOnly GPT-5 Nano measured
LMArena Vision: homework1157Not measuredOnly GPT-5 Nano measured
Kagi LLM Benchmark62.2%58.6%GPT-5 Nano
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index08
Math benchmarks for GPT-5 Nano and gpt-oss-120b
BenchmarkGPT-5 Nanogpt-oss-120bLeader
AIME81.2%92.6%gpt-oss-120b
MATH 500 (Vals AI)93.8%94.8%gpt-oss-120b
MGSM (Vals AI)89.3%92.0%gpt-oss-120b
AA Math Index83.793.4gpt-oss-120b
AIME 2025 (Artificial Analysis run)83.7%93.4%gpt-oss-120b
OTIS Mock AIME81.1%88.9%gpt-oss-120b
FrontierMath, tiers 1 to 320.0%Not measuredOnly GPT-5 Nano measured
FrontierMath, tier 42.4%Not measuredOnly GPT-5 Nano measured
ProofBench12.0%Not measuredOnly GPT-5 Nano measured
MATH level 595.2%Not measuredOnly GPT-5 Nano measured
LMArena Text: math13171389gpt-oss-120b
LMArena Text: mathematical work13261386gpt-oss-120b
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index28
Knowledge benchmarks for GPT-5 Nano and gpt-oss-120b
BenchmarkGPT-5 Nanogpt-oss-120bLeader
MMLU Pro76.1%79.2%gpt-oss-120b
LegalBench (Vals AI)50.1%75.9%gpt-oss-120b
CaseLaw (Vals AI)52.6%48.8%GPT-5 Nano
CorpFin (Vals AI)Not measured58.2%Only gpt-oss-120b measured
TaxEval (Vals AI)67.4%71.6%gpt-oss-120b
MortgageTax (Vals AI)53.6%Not measuredOnly GPT-5 Nano measured
MedQA (Vals AI)93.3%91.4%GPT-5 Nano
MedCode (Vals AI)30.4%Not measuredOnly GPT-5 Nano measured
MMLU Pro (Artificial Analysis run)78.0%80.8%gpt-oss-120b
SimpleQA Verified11.7%Not measuredOnly GPT-5 Nano measured
LMArena Text: science13181382gpt-oss-120b
LMArena Text: medicine and healthcare13351388gpt-oss-120b
LMArena Text: legal and government12981355gpt-oss-120b
LMArena Text: business and finance13111359gpt-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 index60
Web design benchmarks for GPT-5 Nano and gpt-oss-120b
BenchmarkGPT-5 Nanogpt-oss-120bLeader
Design Arena: websites1101967GPT-5 Nano
Design Arena: UI components1064924GPT-5 Nano
Design Arena: game dev1044992GPT-5 Nano
Design Arena: data viz1056987GPT-5 Nano
Design Arena: 3D965901GPT-5 Nano
Design Arena: all code categories1084962GPT-5 Nano
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-5 Nano and gpt-oss-120b
BenchmarkGPT-5 Nanogpt-oss-120bLeader
SAGE (Vals AI)30.4%Not measuredOnly GPT-5 Nano measured
MedScribe (Vals AI)72.9%Not measuredOnly GPT-5 Nano measured
IFBench67.6%69.0%gpt-oss-120b
Long context reasoning (AA-LCR)45.0%52.0%gpt-oss-120b
DTBench62.7%76.3%gpt-oss-120b
LMCA7.9%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 Text13201366gpt-oss-120b
LMArena Text: instruction following13061318gpt-oss-120b
LMArena Text: creative writing12491274gpt-oss-120b
LMArena Vision1159Not measuredOnly GPT-5 Nano measured
LMArena Text: English13211375gpt-oss-120b
LMArena Text: non-English13131351gpt-oss-120b
LMArena Text: Chinese13561385gpt-oss-120b
LMArena Text: German13271353gpt-oss-120b
LMArena Text: Japanese12271331gpt-oss-120b
LMArena Text: Korean12691282gpt-oss-120b
LMArena Text: FrenchNot measured1370Only gpt-oss-120b measured
LMArena Text: Spanish13601389gpt-oss-120b
LMArena Text: Russian12961343gpt-oss-120b
LMArena Text: Polish13141353gpt-oss-120b
LMArena Text: multi-turn13111340gpt-oss-120b
LMArena Text: longer queries13121319gpt-oss-120b
LMArena Text: writing and language12831306gpt-oss-120b
LMArena Text: entertainment and media12681292gpt-oss-120b
LMArena Vision: English1170Not measuredOnly GPT-5 Nano measured
LMArena Vision: Chinese1176Not measuredOnly GPT-5 Nano measured
LMArena Vision: reading text1152Not measuredOnly GPT-5 Nano measured
LMArena Vision: humor1110Not measuredOnly GPT-5 Nano measured
Neither model has a result on the other 15 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5 Nano and gpt-oss-120b
BenchmarkGPT-5 Nanogpt-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 Nano$0.0003Fits in one request
gpt-oss-120b$0.0003Fits in one request

GPT-5 Nano costs less

Repository review

50K input + 3K output tokens

GPT-5 Nano$0.0037Fits in one request
gpt-oss-120b$0.0065Fits in one request

GPT-5 Nano costs less

Agent loop

200K input + 10K output tokens

GPT-5 Nano$0.014Fits in one request
gpt-oss-120b$0.025Exceeds the context window

GPT-5 Nano 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 Nano and gpt-oss-120b
SpecificationOpenAI GPT-5 NanoOpenAI gpt-oss-120b
MakerOpenAIOpenAI
WeightsNo public weights listedOpen weights
ReleasedAugust 7, 2025August 5, 2025
Context window400K131K
Input $/Mtok$0.05$0.10
Output $/Mtok$0.40$0.50
Coding indexNot benchmarkedNot benchmarked
Independent measurements behind it01
Cost per solved task$0.109$0.51
SourceOpenRouter listingOpenRouter listing

Questions

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

Neither model has a coding score yet, so the two cannot be ranked on coding. Pick GPT-5 Nano for output tokens 1.3x cheaper ($0.40 vs $0.50 per million) and a lower cost per solved task ($0.109 against $0.51).

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

GPT-5 Nano costs $0.05 per million input tokens and $0.40 per million output tokens; gpt-oss-120b costs $0.10 and $0.50. Per solved SWE-bench Verified task, GPT-5 Nano costs $0.109 and gpt-oss-120b $0.51.

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

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

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

65 benchmarks have a result for both models as of October 22, 2026. GPT-5 Nano'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.

Compare next