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GPT-5.4 Nano vs Kimi K3

Kimi K3 leads GPT-5.4 Nano on coding, 62.3 to 44.8 on the Vibe Coding Index, and GPT-5.4 Nano costs 12.0x less per output token ($1.25 vs $15.00 per million). Updated October 21, 2026; 70 benchmarks have a result for both.

Replace GPT-5.4 Nano Replace Kimi K3
GPT-5.4 NanoOpenAI
Coding
44.8
Overall
45.7
Output $/M
$1.25
1
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
69
vs boards won of 70 shared

GPT-5.4 Nano or Kimi K3: which to pick

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 44.8 for GPT-5.4 Nano.

Pick GPT-5.4 Nano for output tokens 12.0x cheaper ($1.25 vs $15.00 per million) and a lower cost per solved task ($0.14 against $0.81).

Model AGPT-5.4 NanoOpenAI44.8/1002 independent benchmarks$0.14 per solved taskModel BKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved task
Shared results
70
GPT-5.4 Nano only
15
Kimi K3 only
47
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, Kimi K3 62.3 from 6 benchmarks.
Widest category
Math, 29.4 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: GPT-5.4 Nano 5.0% against Kimi K3 87.0%, 82.0 points apart on a 0 to 100 scale.
Output price
GPT-5.4 Nano $1.25 against Kimi K3 $15.00 per million output tokens, 12.0x apart.
Context window
GPT-5.4 Nano takes 400K tokens, Kimi K3 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 NanoBarsKimi K3Ties
Coding011
Intelligence02
Agentic work05
Reasoning111
Math06
Knowledge011
General023
All shared boards169
CodingLike-for-likeSix of these boards feed the Vibe Coding Index011
Coding benchmarks for GPT-5.4 Nano and Kimi K3
BenchmarkGPT-5.4 NanoKimi K3Leader
LiveBench codingNot measured59.3%Only Kimi K3 measured
LMArena WebDevNot measured1655Only Kimi K3 measured
AA Coding Index56.176.2Kimi K3
LiveCodeBench (Vals AI)84.0%87.2%Kimi K3
SWE-bench Verified (Vals AI)69.8%93.4%Kimi K3
Terminal-Bench 4 (Vals AI)Not measured17.2%Only Kimi K3 measured
Vibe Code Bench (Vals AI)26.1%85.0%Kimi K3
Code migration (Vals AI)14.5%16.1%Kimi K3
ProgramBench (Vals AI)Not measured2.0%Only Kimi K3 measured
IOI (Vals AI)Not measured48.9%Only Kimi K3 measured
Terminal-Bench 2.1 (Vals AI)41.6%80.9%Kimi K3
SWE-bench Multimodal (Vals AI)Not measured44.2%Only Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)Not measured18.2%Only Kimi K3 measured
CyberBench (Vals AI)Not measured75.2%Only Kimi K3 measured
SciCode47.2%59.5%Kimi K3
Terminal-Bench Hard (Artificial Analysis run)42.4%Not measuredOnly GPT-5.4 Nano measured
FrontierCodeNot measured44.2%Only Kimi K3 measured
FrontierSWENot measured25.9%Only Kimi K3 measured
WeirdML49.2%82.6%Kimi K3
ALE-Bench1004.51524.5Kimi K3
LMArena Text: coding14041508Kimi K3
LMArena Text: software and IT14021499Kimi K3
LMArena WebDev: ReactNot measured1670Only Kimi K3 measured
LMArena WebDev: HTMLNot measured1644Only Kimi K3 measured
LMArena WebDev: from an imageNot measured1579Only Kimi K3 measured
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GPT-5.4 Nano and Kimi K3
BenchmarkGPT-5.4 NanoKimi K3Leader
AA Intelligence Index20.743.6Kimi K3
Epoch Capabilities Index146.0157.9Kimi K3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index05
Agentic work benchmarks for GPT-5.4 Nano and Kimi K3
BenchmarkGPT-5.4 NanoKimi K3Leader
AA Agentic Index16.050.0Kimi K3
Design Arena: agents building web appsNot measured1295Only Kimi K3 measured
Design Arena: agents building full-stack appsNot measured1315Only Kimi K3 measured
Design Arena: agents building mobile appsNot measured1269Only Kimi K3 measured
Design Arena: agents building Android appsNot measured1250Only Kimi K3 measured
Design Arena: agents building Godot gamesNot measured1223Only Kimi K3 measured
Design Arena: agents building gamesNot measured1252Only Kimi K3 measured
Design Arena: HTML slidesNot measured1256Only Kimi K3 measured
Design Arena: PowerPoint slidesNot measured1273Only Kimi K3 measured
Design Arena: spreadsheetsNot measured1058Only Kimi K3 measured
LiveBench researchNot measured79.0%Only Kimi K3 measured
LiveBench browserNot measured16.0%Only Kimi K3 measured
LiveBench long agenticNot measured42.8%Only Kimi K3 measured
Finance Agent (Vals AI)38.2%53.1%Kimi K3
Tax Agent Bench (Vals AI)5.0%33.4%Kimi K3
Legal Research Bench (Vals AI)6.3%46.1%Kimi K3
Harvey's Legal Agent Benchmark (Vals AI)Not measured12.9%Only Kimi K3 measured
Excel Modeling Benchmark (Vals AI)44.8%66.7%Kimi K3
BioMysteryBench (Vals AI)Not measured72.6%Only Kimi K3 measured
Terminal-Bench-Science (Vals AI)Not measured1.4%Only Kimi K3 measured
Time Horizon Index (Vals AI)Not measured10.5%Only Kimi K3 measured
τ²-Bench Telecom76.0%Not measuredOnly GPT-5.4 Nano measured
APEX-AgentsNot measured47.8%Only Kimi K3 measured
PostTrainBenchNot measured32.0%Only Kimi K3 measured
Vending-Bench 2Not measured$5,165Only Kimi K3 measured
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index111
Reasoning benchmarks for GPT-5.4 Nano and Kimi K3
BenchmarkGPT-5.4 NanoKimi K3Leader
GPQA Diamond77.5%92.9%Kimi K3
LiveBench reasoningNot measured90.7%Only Kimi K3 measured
MMMU Pro (Vals AI)73.6%88.2%Kimi K3
GPQA Diamond (Artificial Analysis run)81.7%93.5%Kimi K3
Humanity's Last Exam (Artificial Analysis run)28.3%46.9%Kimi K3
GPQA Diamond (Epoch AI run)78.5%93.1%Kimi K3
ARC-AGI51.5%94.5%Kimi K3
ARC-AGI-25.7%60.4%Kimi K3
SimpleBenchNot measured60.7%Only Kimi K3 measured
Chess puzzles45.0%37.0%GPT-5.4 Nano
Mystery game puzzles9.0%26.0%Kimi K3
LMArena Text: hard prompts13811495Kimi K3
LMArena Text: expert13961520Kimi K3
LMArena Text: hard prompts in English13871496Kimi K3
LMArena Vision: diagrams1210Not measuredOnly GPT-5.4 Nano measured
LMArena Vision: homework1225Not measuredOnly GPT-5.4 Nano measured
Kagi LLM Benchmark39.7%Not measuredOnly GPT-5.4 Nano measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for GPT-5.4 Nano and Kimi K3
BenchmarkGPT-5.4 NanoKimi K3Leader
AIME88.8%Not measuredOnly GPT-5.4 Nano measured
OTIS Mock AIME87.8%97.2%Kimi K3
FrontierMath, tiers 1 to 344.9%72.2%Kimi K3
FrontierMath, tier 412.2%39.0%Kimi K3
ProofBench5.0%87.0%Kimi K3
LMArena Text: math14051494Kimi K3
LMArena Text: mathematical work14091505Kimi K3
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index011
Knowledge benchmarks for GPT-5.4 Nano and Kimi K3
BenchmarkGPT-5.4 NanoKimi K3Leader
MMLU Pro77.2%88.0%Kimi K3
LegalBench (Vals AI)77.9%86.2%Kimi K3
CaseLaw (Vals AI)51.9%Not measuredOnly GPT-5.4 Nano measured
CorpFin (Vals AI)61.2%71.6%Kimi K3
TaxEval (Vals AI)67.4%75.7%Kimi K3
MortgageTax (Vals AI)59.1%66.3%Kimi K3
MedCode (Vals AI)41.0%49.4%Kimi K3
SimpleQA Verified11.7%50.6%Kimi K3
LMArena Text: science13741508Kimi K3
LMArena Text: medicine and healthcare13691489Kimi K3
LMArena Text: legal and government13681503Kimi K3
LMArena Text: business and finance13661470Kimi K3
Neither model has a result on the other 6 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for GPT-5.4 Nano and Kimi K3
BenchmarkGPT-5.4 NanoKimi K3Leader
Design Arena: websitesNot measured1335Only Kimi K3 measured
Design Arena: UI componentsNot measured1344Only Kimi K3 measured
Design Arena: game devNot measured1359Only Kimi K3 measured
Design Arena: data vizNot measured1351Only Kimi K3 measured
Design Arena: 3DNot measured1388Only Kimi K3 measured
Design Arena: all code categoriesNot measured1360Only Kimi K3 measured
Design Arena: SVGNot measured1302Only Kimi K3 measured
LiveBench designNot measured77.2%Only Kimi K3 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index023
General benchmarks for GPT-5.4 Nano and Kimi K3
BenchmarkGPT-5.4 NanoKimi K3Leader
Vals IndexNot measured53.0%Only Kimi K3 measured
LiveBench data analysisNot measured78.7%Only Kimi K3 measured
Public Benefits Bench (Vals AI)Not measured68.2%Only Kimi K3 measured
SAGE (Vals AI)38.1%52.8%Kimi K3
MedScribe (Vals AI)77.1%88.0%Kimi K3
Vals Multimodal Index47.6%73.4%Kimi K3
IFBench75.9%Not measuredOnly GPT-5.4 Nano measured
Long context reasoning (AA-LCR)76.7%88.7%Kimi K3
DTBench80.3%91.2%Kimi K3
LMCA36.9%52.7%Kimi K3
Surface Evolver BenchNot measured95.0%Only Kimi K3 measured
Furniture assemblyNot measured34.2%Only Kimi K3 measured
LMArena Text13721476Kimi K3
LMArena Text: instruction following13621485Kimi K3
LMArena Text: creative writing13151457Kimi K3
LMArena Vision1196Not measuredOnly GPT-5.4 Nano measured
LMArena Text: English13811481Kimi K3
LMArena Text: non-English13591466Kimi K3
LMArena Text: Chinese13911529Kimi K3
LMArena Text: German13681490Kimi K3
LMArena Text: Japanese13431494Kimi K3
LMArena Text: Korean13211460Kimi K3
LMArena Text: French13951492Kimi K3
LMArena Text: Spanish13711472Kimi K3
LMArena Text: Russian13631485Kimi K3
LMArena Text: Polish13661458Kimi K3
LMArena Text: multi-turn13821489Kimi K3
LMArena Text: longer queries13651494Kimi K3
LMArena Text: writing and language13381471Kimi K3
LMArena Text: entertainment and media13251453Kimi K3
LMArena Vision: English1202Not measuredOnly GPT-5.4 Nano measured
LMArena Vision: Chinese1232Not measuredOnly GPT-5.4 Nano measured
LMArena Vision: reading text1204Not measuredOnly GPT-5.4 Nano measured
LMArena Vision: humor1161Not measuredOnly GPT-5.4 Nano measured
LMArena Vision: recognizing things1141Not measuredOnly GPT-5.4 Nano measured
LMArena Vision: creative writing1159Not measuredOnly GPT-5.4 Nano measured
Neither model has a result on the other 10 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 Kimi K3
BenchmarkGPT-5.4 NanoKimi K3Leader
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
Kimi K3$0.011Fits in one request

GPT-5.4 Nano costs less

Repository review

50K input + 3K output tokens

GPT-5.4 Nano$0.014Fits in one request
Kimi K3$0.195Fits in one request

GPT-5.4 Nano costs less

Agent loop

200K input + 10K output tokens

GPT-5.4 Nano$0.052Fits in one request
Kimi K3$0.750Fits in one request

GPT-5.4 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-5.4 Nano and Kimi K3
SpecificationOpenAI GPT-5.4 NanoMoonshotAI Kimi K3
MakerOpenAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedMarch 17, 2026July 16, 2026
Context window400K1.05M
Input $/Mtok$0.20$3.00
Output $/Mtok$1.25$15.00
Coding index44.862.3
Independent measurements behind it26
Cost per solved task$0.14$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.4 Nano better than Kimi K3 for coding?

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 44.8 for GPT-5.4 Nano. Pick GPT-5.4 Nano for output tokens 12.0x cheaper ($1.25 vs $15.00 per million) and a lower cost per solved task ($0.14 against $0.81).

Which is cheaper, GPT-5.4 Nano or Kimi K3?

GPT-5.4 Nano costs $0.20 per million input tokens and $1.25 per million output tokens; Kimi K3 costs $3.00 and $15.00. Per solved SWE-bench Verified task, GPT-5.4 Nano costs $0.14 and Kimi K3 $0.81.

Which has the bigger context window, GPT-5.4 Nano or Kimi K3?

Kimi K3, with 1.05M tokens against 400K.

How many benchmarks is the GPT-5.4 Nano vs Kimi K3 comparison based on?

70 benchmarks have a result for both models as of October 21, 2026. GPT-5.4 Nano's coding index rests on 2 independent benchmarks and Kimi K3's on 6. Where only one model has a result, the page says so instead of naming a winner.

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