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GPT-5.4 Nano vs GPT-6 Luna

GPT-6 Luna leads GPT-5.4 Nano on coding, 57.3 to 44.8 on the Vibe Coding Index, and GPT-6 Luna costs 2.5x less per output token ($0.50 vs $1.25 per million). Updated October 22, 2026; 63 benchmarks have a result for both.

Replace GPT-5.4 Nano Replace GPT-6 Luna
GPT-5.4 NanoOpenAI
Coding
44.8
Overall
45.7
Output $/M
$1.25
3
GPT-6 LunaOpenAI
Coding
57.3
Overall
59.7
Output $/M
$0.50
60
vs boards won of 63 shared

GPT-5.4 Nano or GPT-6 Luna: which to pick

Pick GPT-6 Luna for coding: it scores 57.3 on the Vibe Coding Index against 44.8 for GPT-5.4 Nano.

Pick GPT-5.4 Nano for work measured by Chess puzzles or Mystery game puzzles, where it leads.

Model AGPT-5.4 NanoOpenAI44.8/1002 independent benchmarks$0.14 per solved taskModel BGPT-6 LunaOpenAI57.3/1005 independent benchmarksNo cost per solved task
Shared results
63
GPT-5.4 Nano only
22
GPT-6 Luna only
41
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 Nano 44.8 from 2 benchmarks, GPT-6 Luna 57.3 from 5 benchmarks.
Widest category
Math, 25.3 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: GPT-5.4 Nano 5.0% against GPT-6 Luna 64.0%, 59.0 points apart on a 0 to 100 scale.
Output price
GPT-5.4 Nano $1.25 against GPT-6 Luna $0.50 per million output tokens, 2.5x apart.
Context window
GPT-5.4 Nano takes 400K tokens, GPT-6 Luna 1.05M.

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 NanoBarsGPT-6 LunaTies
Coding07
Intelligence02
Agentic work04
Reasoning29
Math06
Knowledge15
General027
All shared boards360
CodingLike-for-likeSix of these boards feed the Vibe Coding Index07
Coding benchmarks for GPT-5.4 Nano and GPT-6 Luna
BenchmarkGPT-5.4 NanoGPT-6 LunaLeader
LiveBench codingNot measured84.5%Only GPT-6 Luna measured
LMArena WebDevNot measured1578Only GPT-6 Luna measured
AA Coding Index56.1Not measuredOnly GPT-5.4 Nano measured
LiveCodeBench (Vals AI)84.0%Not measuredOnly GPT-5.4 Nano measured
SWE-bench Verified (Vals AI)69.8%Not measuredOnly GPT-5.4 Nano measured
Terminal-Bench 4 (Vals AI)Not measured13.6%Only GPT-6 Luna measured
Vibe Code Bench (Vals AI)26.1%81.7%GPT-6 Luna
Code migration (Vals AI)14.5%42.5%GPT-6 Luna
ProgramBench (Vals AI)Not measured0.5%Only GPT-6 Luna measured
IOI (Vals AI)Not measured55.6%Only GPT-6 Luna measured
Terminal-Bench 2.1 (Vals AI)41.6%73.0%GPT-6 Luna
SWE-bench Multimodal (Vals AI)Not measured37.5%Only GPT-6 Luna measured
CyberBench (Vals AI)Not measured76.3%Only GPT-6 Luna measured
SciCode47.2%54.6%GPT-6 Luna
Terminal-Bench Hard (Artificial Analysis run)42.4%Not measuredOnly GPT-5.4 Nano measured
FrontierCodeNot measured42.4%Only GPT-6 Luna measured
WeirdML49.2%Not measuredOnly GPT-5.4 Nano measured
ALE-Bench1004.51576.9GPT-6 Luna
LMArena Text: coding14041437GPT-6 Luna
LMArena Text: software and IT14021423GPT-6 Luna
LMArena WebDev: ReactNot measured1573Only GPT-6 Luna measured
LMArena WebDev: HTMLNot measured1595Only GPT-6 Luna measured
LMArena WebDev: from an imageNot measured1571Only GPT-6 Luna measured
Neither model has a result on the other 20 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-5.4 Nano and GPT-6 Luna
BenchmarkGPT-5.4 NanoGPT-6 LunaLeader
AA Intelligence Index20.738.1GPT-6 Luna
Epoch Capabilities Index146.0156.8GPT-6 Luna
Agentic workLike-for-likePublic boards, shown as published, kept out of the index04
Agentic work benchmarks for GPT-5.4 Nano and GPT-6 Luna
BenchmarkGPT-5.4 NanoGPT-6 LunaLeader
AA Agentic Index16.0Not measuredOnly GPT-5.4 Nano measured
Design Arena: agents building web appsNot measured1191Only GPT-6 Luna measured
Design Arena: agents building full-stack appsNot measured1158Only GPT-6 Luna measured
Design Arena: agents building mobile appsNot measured1131Only GPT-6 Luna measured
LiveBench researchNot measured43.5%Only GPT-6 Luna measured
LiveBench browserNot measured72.0%Only GPT-6 Luna measured
LiveBench long agenticNot measured48.1%Only GPT-6 Luna measured
SREBench (Vals AI)Not measured2.7%Only GPT-6 Luna measured
Finance Agent (Vals AI)38.2%49.9%GPT-6 Luna
Tax Agent Bench (Vals AI)5.0%19.9%GPT-6 Luna
Legal Research Bench (Vals AI)6.3%30.3%GPT-6 Luna
Harvey's Legal Agent Benchmark (Vals AI)Not measured4.2%Only GPT-6 Luna measured
Excel Modeling Benchmark (Vals AI)44.8%68.5%GPT-6 Luna
BioMysteryBench (Vals AI)Not measured61.5%Only GPT-6 Luna measured
Terminal-Bench-Science (Vals AI)Not measured4.3%Only GPT-6 Luna measured
Vals Science IndexNot measured28.4%Only GPT-6 Luna measured
τ²-Bench Telecom76.0%Not measuredOnly GPT-5.4 Nano measured
APEX-AgentsNot measured44.3%Only GPT-6 Luna measured
SpireClimbNot measured0.0%Only GPT-6 Luna measured
Neither model has a result on the other 23 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index29
Reasoning benchmarks for GPT-5.4 Nano and GPT-6 Luna
BenchmarkGPT-5.4 NanoGPT-6 LunaLeader
GPQA Diamond77.5%Not measuredOnly GPT-5.4 Nano measured
LiveBench reasoningNot measured81.8%Only GPT-6 Luna measured
MysteryMechanism (Vals AI)Not measured19.4%Only GPT-6 Luna measured
MMMU Pro (Vals AI)73.6%Not measuredOnly GPT-5.4 Nano measured
GPQA Diamond (Artificial Analysis run)81.7%Not measuredOnly GPT-5.4 Nano measured
Humanity's Last Exam (Artificial Analysis run)28.3%38.5%GPT-6 Luna
GPQA Diamond (Epoch AI run)78.5%90.5%GPT-6 Luna
ARC-AGI51.5%86.7%GPT-6 Luna
ARC-AGI-25.7%59.3%GPT-6 Luna
Chess puzzles45.0%36.0%GPT-5.4 Nano
Mystery game puzzles9.0%7.0%GPT-5.4 Nano
LMArena Text: hard prompts13811410GPT-6 Luna
LMArena Text: expert13961442GPT-6 Luna
LMArena Text: hard prompts in English13871410GPT-6 Luna
LMArena Vision: diagrams12101245GPT-6 Luna
LMArena Vision: homework12251261GPT-6 Luna
Kagi LLM Benchmark39.7%Not measuredOnly GPT-5.4 Nano measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for GPT-5.4 Nano and GPT-6 Luna
BenchmarkGPT-5.4 NanoGPT-6 LunaLeader
AIME88.8%Not measuredOnly GPT-5.4 Nano measured
OTIS Mock AIME87.8%98.9%GPT-6 Luna
FrontierMath, tiers 1 to 344.9%78.9%GPT-6 Luna
FrontierMath, tier 412.2%56.1%GPT-6 Luna
ProofBench5.0%64.0%GPT-6 Luna
LMArena Text: math14051409GPT-6 Luna
LMArena Text: mathematical work14091427GPT-6 Luna
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index15
Knowledge benchmarks for GPT-5.4 Nano and GPT-6 Luna
BenchmarkGPT-5.4 NanoGPT-6 LunaLeader
MMLU Pro77.2%Not measuredOnly GPT-5.4 Nano measured
LegalBench (Vals AI)77.9%Not measuredOnly GPT-5.4 Nano measured
CaseLaw (Vals AI)51.9%Not measuredOnly GPT-5.4 Nano measured
CorpFin (Vals AI)61.2%Not measuredOnly GPT-5.4 Nano measured
TaxEval (Vals AI)67.4%Not measuredOnly GPT-5.4 Nano measured
MortgageTax (Vals AI)59.1%Not measuredOnly GPT-5.4 Nano measured
MedCode (Vals AI)41.0%44.7%GPT-6 Luna
SimpleQA Verified11.7%41.4%GPT-6 Luna
LMArena Text: science13741386GPT-6 Luna
LMArena Text: medicine and healthcare13691352GPT-5.4 Nano
LMArena Text: legal and government13681400GPT-6 Luna
LMArena Text: business and finance13661388GPT-6 Luna
FACTS Benchmark SuiteNot measured63.3%Only GPT-6 Luna measured
PRBench LegalNot measured42.9%Only GPT-6 Luna measured
Neither model has a result on the other 6 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
Web design benchmarks for GPT-5.4 Nano and GPT-6 Luna
BenchmarkGPT-5.4 NanoGPT-6 LunaLeader
Design Arena: websitesNot measured1271Only GPT-6 Luna measured
Design Arena: UI componentsNot measured1295Only GPT-6 Luna measured
Design Arena: game devNot measured1258Only GPT-6 Luna measured
Design Arena: data vizNot measured1217Only GPT-6 Luna measured
Design Arena: 3DNot measured1218Only GPT-6 Luna measured
Design Arena: all code categoriesNot measured1270Only GPT-6 Luna measured
Design Arena: SVGNot measured1253Only GPT-6 Luna measured
Design Arena: ASCII artNot measured1153Only GPT-6 Luna measured
LiveBench designNot measured82.5%Only GPT-6 Luna measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index027
General benchmarks for GPT-5.4 Nano and GPT-6 Luna
BenchmarkGPT-5.4 NanoGPT-6 LunaLeader
Vals IndexNot measured52.3%Only GPT-6 Luna measured
LiveBench data analysisNot measured73.4%Only GPT-6 Luna measured
Public Benefits Bench (Vals AI)Not measured57.6%Only GPT-6 Luna measured
SAGE (Vals AI)38.1%48.1%GPT-6 Luna
MedScribe (Vals AI)77.1%83.7%GPT-6 Luna
Vals Multimodal Index47.6%Not measuredOnly GPT-5.4 Nano measured
IFBench75.9%Not measuredOnly GPT-5.4 Nano measured
Long context reasoning (AA-LCR)76.7%83.3%GPT-6 Luna
DTBench80.3%90.1%GPT-6 Luna
LMCA36.9%44.5%GPT-6 Luna
Furniture assemblyNot measured44.2%Only GPT-6 Luna measured
LMArena Text13721389GPT-6 Luna
LMArena Text: instruction following13621408GPT-6 Luna
LMArena Text: creative writing13151363GPT-6 Luna
LMArena Vision11961216GPT-6 Luna
LMArena Text: English13811393GPT-6 Luna
LMArena Text: non-English13591381GPT-6 Luna
LMArena Text: Chinese13911427GPT-6 Luna
LMArena Text: German13681376GPT-6 Luna
LMArena Text: Japanese13431369GPT-6 Luna
LMArena Text: Korean13211359GPT-6 Luna
LMArena Text: French13951408GPT-6 Luna
LMArena Text: Spanish13711391GPT-6 Luna
LMArena Text: Russian13631392GPT-6 Luna
LMArena Text: Polish13661383GPT-6 Luna
LMArena Text: multi-turn13821392GPT-6 Luna
LMArena Text: longer queries13651408GPT-6 Luna
LMArena Text: writing and language13381384GPT-6 Luna
LMArena Text: entertainment and media13251364GPT-6 Luna
LMArena Vision: English12021204GPT-6 Luna
LMArena Vision: Chinese12321266GPT-6 Luna
LMArena Vision: reading text12041225GPT-6 Luna
LMArena Vision: humor1161Not measuredOnly GPT-5.4 Nano measured
LMArena Vision: recognizing things1141Not measuredOnly GPT-5.4 Nano measured
LMArena Vision: creative writing11591205GPT-6 Luna
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 Nano and GPT-6 Luna
BenchmarkGPT-5.4 NanoGPT-6 LunaLeader
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 Nano$0.0008Fits in one request
GPT-6 Luna$0.0003Fits in one request

GPT-6 Luna costs less

Repository review

50K input + 3K output tokens

GPT-5.4 Nano$0.014Fits in one request
GPT-6 Luna$0.0065Fits in one request

GPT-6 Luna costs less

Agent loop

200K input + 10K output tokens

GPT-5.4 Nano$0.052Fits in one request
GPT-6 Luna$0.025Fits in one request

GPT-6 Luna 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 Nano and GPT-6 Luna
SpecificationOpenAI GPT-5.4 NanoOpenAI GPT-6 Luna
MakerOpenAIOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedMarch 17, 2026September 22, 2026
Context window400K1.05M
Input $/Mtok$0.20$0.10
Output $/Mtok$1.25$0.50
Coding index44.857.3
Independent measurements behind it25
Cost per solved task$0.14Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.4 Nano better than GPT-6 Luna for coding?

Pick GPT-6 Luna for coding: it scores 57.3 on the Vibe Coding Index against 44.8 for GPT-5.4 Nano. Pick GPT-5.4 Nano for work measured by Chess puzzles or Mystery game puzzles, where it leads.

Which is cheaper, GPT-5.4 Nano or GPT-6 Luna?

GPT-5.4 Nano costs $0.20 per million input tokens and $1.25 per million output tokens; GPT-6 Luna costs $0.10 and $0.50. Cost per solved task is known for GPT-5.4 Nano only.

Which has the bigger context window, GPT-5.4 Nano or GPT-6 Luna?

GPT-6 Luna, with 1.05M tokens against 400K.

How many benchmarks is the GPT-5.4 Nano vs GPT-6 Luna comparison based on?

63 benchmarks have a result for both models as of October 22, 2026. GPT-5.4 Nano's coding index rests on 2 independent benchmarks and GPT-6 Luna's on 5. Where only one model has a result, the page says so instead of naming a winner.

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