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Kimi K3 vs Nemotron 3 Ultra

Kimi K3 leads Nemotron 3 Ultra on coding, 62.3 to 30.0 on the Vibe Coding Index, and Nemotron 3 Ultra costs 6.3x less per output token ($2.40 vs $15.00 per million). Updated October 22, 2026; 67 benchmarks have a result for both.

Replace Kimi K3 Replace Nemotron 3 Ultra
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
67
Nemotron 3 UltraNVIDIA
Coding
30.0
Overall
53.1
Output $/M
$2.40
0
vs boards won of 67 shared

Kimi K3 or Nemotron 3 Ultra: which to pick

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 30.0 for Nemotron 3 Ultra.

Pick Nemotron 3 Ultra for output tokens 6.3x cheaper ($2.40 vs $15.00 per million).

Model AKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved taskModel BNemotron 3 UltraNVIDIA30.0/1003 independent benchmarksNo cost per solved task
Shared results
67
Kimi K3 only
55
Nemotron 3 Ultra only
4
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
Kimi K3 62.3 from 6 benchmarks, Nemotron 3 Ultra 30.0 from 3 benchmarks.
Widest category
Web design, 27.3 points apart on average over 7 shared benchmarks.
Widest single gap
ProofBench: Kimi K3 87.0% against Nemotron 3 Ultra 2.0%, 85.0 points apart on a 0 to 100 scale.
Output price
Kimi K3 $15.00 against Nemotron 3 Ultra $2.40 per million output tokens, 6.3x apart.
Context window
Kimi K3 takes 1.05M tokens, Nemotron 3 Ultra 262K.

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
CategoryKimi K3BarsNemotron 3 UltraTies
Coding120
Intelligence20
Agentic work60
Reasoning80
Math40
Knowledge90
Web design70
General190
All shared boards670
CodingLike-for-likeSix of these boards feed the Vibe Coding Index120
Coding benchmarks for Kimi K3 and Nemotron 3 Ultra
BenchmarkKimi K3Nemotron 3 UltraLeader
LiveBench coding59.3%Not measuredOnly Kimi K3 measured
LMArena WebDev1655Not measuredOnly Kimi K3 measured
AA Coding Index76.249.3Kimi K3
LiveCodeBench (Vals AI)87.2%86.0%Kimi K3
SWE-bench Verified (Vals AI)93.4%69.0%Kimi K3
Terminal-Bench 4 (Vals AI)17.2%Not measuredOnly Kimi K3 measured
Vibe Code Bench (Vals AI)85.0%7.6%Kimi K3
Code migration (Vals AI)16.1%4.9%Kimi K3
ProgramBench (Vals AI)2.0%0.0%Kimi K3
IOI (Vals AI)48.9%Not measuredOnly Kimi K3 measured
Terminal-Bench 2.1 (Vals AI)80.9%50.9%Kimi K3
SWE-bench Multimodal (Vals AI)44.2%Not measuredOnly Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)18.2%Not measuredOnly Kimi K3 measured
CyberBench (Vals AI)75.2%Not measuredOnly Kimi K3 measured
SciCode59.5%40.3%Kimi K3
Terminal-Bench Hard (Artificial Analysis run)Not measured36.4%Only Nemotron 3 Ultra measured
FrontierCode44.2%13.6%Kimi K3
FrontierSWE25.9%Not measuredOnly Kimi K3 measured
WeirdML82.6%43.5%Kimi K3
ALE-Bench1524.5Not measuredOnly Kimi K3 measured
LMArena Text: coding15081468Kimi K3
LMArena Text: software and IT14991468Kimi K3
LMArena WebDev: React1670Not measuredOnly Kimi K3 measured
LMArena WebDev: HTML1644Not measuredOnly Kimi K3 measured
LMArena WebDev: from an image1579Not measuredOnly Kimi K3 measured
SWE-Bench Pro V297.7%Not measuredOnly Kimi K3 measured
Neither model has a result on the other 17 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Kimi K3 and Nemotron 3 Ultra
BenchmarkKimi K3Nemotron 3 UltraLeader
AA Intelligence Index43.622.9Kimi K3
Epoch Capabilities Index157.9146.0Kimi K3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index60
Agentic work benchmarks for Kimi K3 and Nemotron 3 Ultra
BenchmarkKimi K3Nemotron 3 UltraLeader
AA Agentic Index50.020.1Kimi K3
Design Arena: agents building web apps1295Not measuredOnly Kimi K3 measured
Design Arena: agents building full-stack apps1315Not measuredOnly Kimi K3 measured
Design Arena: agents building mobile apps1268Not measuredOnly Kimi K3 measured
Design Arena: agents building Android apps1252Not measuredOnly Kimi K3 measured
Design Arena: agents building Godot games1223Not measuredOnly Kimi K3 measured
Design Arena: agents building games1252Not measuredOnly Kimi K3 measured
Design Arena: HTML slides1196Not measuredOnly Kimi K3 measured
Design Arena: PowerPoint slides1245Not measuredOnly Kimi K3 measured
Design Arena: spreadsheets1096Not measuredOnly Kimi K3 measured
LiveBench research79.0%Not measuredOnly Kimi K3 measured
LiveBench browser16.0%Not measuredOnly Kimi K3 measured
LiveBench long agentic42.8%Not measuredOnly Kimi K3 measured
Finance Agent (Vals AI)53.1%37.7%Kimi K3
Tax Agent Bench (Vals AI)33.4%Not measuredOnly Kimi K3 measured
Legal Research Bench (Vals AI)46.1%15.4%Kimi K3
Harvey's Legal Agent Benchmark (Vals AI)12.9%Not measuredOnly Kimi K3 measured
Excel Modeling Benchmark (Vals AI)66.7%31.7%Kimi K3
BioMysteryBench (Vals AI)72.6%Not measuredOnly Kimi K3 measured
Terminal-Bench-Science (Vals AI)1.4%Not measuredOnly Kimi K3 measured
Time Horizon Index (Vals AI)10.5%Not measuredOnly Kimi K3 measured
τ²-Bench TelecomNot measured83.3%Only Nemotron 3 Ultra measured
APEX-Agents47.8%22.7%Kimi K3
PostTrainBench32.0%Not measuredOnly Kimi K3 measured
Vending-Bench 2$5,165Not measuredOnly Kimi K3 measured
MCP Atlas82.3%63.1%Kimi K3
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index80
Reasoning benchmarks for Kimi K3 and Nemotron 3 Ultra
BenchmarkKimi K3Nemotron 3 UltraLeader
GPQA Diamond92.9%86.1%Kimi K3
LiveBench reasoning90.7%Not measuredOnly Kimi K3 measured
MMMU Pro (Vals AI)88.2%Not measuredOnly Kimi K3 measured
GPQA Diamond (Artificial Analysis run)93.5%86.7%Kimi K3
Humanity's Last Exam (Artificial Analysis run)46.9%28.4%Kimi K3
GPQA Diamond (Epoch AI run)93.1%85.4%Kimi K3
ARC-AGI94.5%Not measuredOnly Kimi K3 measured
ARC-AGI-260.4%Not measuredOnly Kimi K3 measured
SimpleBench60.7%Not measuredOnly Kimi K3 measured
Chess puzzles37.0%Not measuredOnly Kimi K3 measured
Mystery game puzzles26.0%20.0%Kimi K3
LMArena Text: hard prompts14951452Kimi K3
LMArena Text: expert15201472Kimi K3
LMArena Text: hard prompts in English14961453Kimi K3
Humanity's Last Exam (Scale run)22.2%Not measuredOnly Kimi K3 measured
Neither model has a result on the other 8 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index40
Math benchmarks for Kimi K3 and Nemotron 3 Ultra
BenchmarkKimi K3Nemotron 3 UltraLeader
OTIS Mock AIME97.2%86.7%Kimi K3
FrontierMath, tiers 1 to 372.2%Not measuredOnly Kimi K3 measured
FrontierMath, tier 439.0%Not measuredOnly Kimi K3 measured
ProofBench87.0%2.0%Kimi K3
LMArena Text: math14941457Kimi K3
LMArena Text: mathematical work15051461Kimi K3
MathArena48.0%Not measuredOnly Kimi K3 measured
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index90
Knowledge benchmarks for Kimi K3 and Nemotron 3 Ultra
BenchmarkKimi K3Nemotron 3 UltraLeader
MMLU Pro88.0%85.8%Kimi K3
LegalBench (Vals AI)86.2%82.1%Kimi K3
CorpFin (Vals AI)71.6%65.5%Kimi K3
TaxEval (Vals AI)75.7%73.1%Kimi K3
MortgageTax (Vals AI)66.3%Not measuredOnly Kimi K3 measured
MedCode (Vals AI)49.4%38.6%Kimi K3
SimpleQA Verified50.6%Not measuredOnly Kimi K3 measured
LMArena Text: science15081465Kimi K3
LMArena Text: medicine and healthcare14891456Kimi K3
LMArena Text: legal and government15031452Kimi K3
LMArena Text: business and finance14701434Kimi K3
Neither model has a result on the other 9 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index70
Web design benchmarks for Kimi K3 and Nemotron 3 Ultra
BenchmarkKimi K3Nemotron 3 UltraLeader
Design Arena: websites13351145Kimi K3
Design Arena: UI components13401135Kimi K3
Design Arena: game dev13601138Kimi K3
Design Arena: data viz13521141Kimi K3
Design Arena: 3D13871131Kimi K3
Design Arena: all code categories13601146Kimi K3
Design Arena: SVG13011069Kimi K3
Design Arena: ASCII artNot measured1100Only Nemotron 3 Ultra measured
LiveBench design77.2%Not measuredOnly Kimi K3 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index190
General benchmarks for Kimi K3 and Nemotron 3 Ultra
BenchmarkKimi K3Nemotron 3 UltraLeader
Vals Index53.0%Not measuredOnly Kimi K3 measured
LiveBench data analysis78.7%Not measuredOnly Kimi K3 measured
Public Benefits Bench (Vals AI)68.2%Not measuredOnly Kimi K3 measured
SAGE (Vals AI)52.8%Not measuredOnly Kimi K3 measured
MedScribe (Vals AI)88.0%Not measuredOnly Kimi K3 measured
Vals Multimodal Index73.4%Not measuredOnly Kimi K3 measured
IFBenchNot measured81.4%Only Nemotron 3 Ultra measured
Long context reasoning (AA-LCR)88.7%79.3%Kimi K3
DTBench91.2%90.1%Kimi K3
LMCA52.7%36.9%Kimi K3
Surface Evolver Bench95.0%Not measuredOnly Kimi K3 measured
Furniture assembly34.2%Not measuredOnly Kimi K3 measured
LMArena Text14761445Kimi K3
LMArena Text: instruction following14851418Kimi K3
LMArena Text: creative writing14571399Kimi K3
LMArena Text: English14811455Kimi K3
LMArena Text: non-English14661427Kimi K3
LMArena Text: Chinese15291497Kimi K3
LMArena Text: German14901472Kimi K3
LMArena Text: Japanese1494Not measuredOnly Kimi K3 measured
LMArena Text: Korean14601384Kimi K3
LMArena Text: French14921472Kimi K3
LMArena Text: Spanish14721455Kimi K3
LMArena Text: Russian14851417Kimi K3
LMArena Text: Polish14581385Kimi K3
LMArena Text: multi-turn14891411Kimi K3
LMArena Text: longer queries14941437Kimi K3
LMArena Text: writing and language14711406Kimi K3
LMArena Text: entertainment and media14531397Kimi K3
EQ-Bench 41339Not measuredOnly Kimi K3 measured
Neither model has a result on the other 18 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Kimi K3 and Nemotron 3 Ultra
BenchmarkKimi K3Nemotron 3 UltraLeader
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

Kimi K3$0.011Fits in one request
Nemotron 3 Ultra$0.0018Fits in one request

Nemotron 3 Ultra costs less

Repository review

50K input + 3K output tokens

Kimi K3$0.195Fits in one request
Nemotron 3 Ultra$0.037Fits in one request

Nemotron 3 Ultra costs less

Agent loop

200K input + 10K output tokens

Kimi K3$0.750Fits in one request
Nemotron 3 Ultra$0.144Fits in one request

Nemotron 3 Ultra 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 Kimi K3 and Nemotron 3 Ultra
SpecificationMoonshotAI Kimi K3NVIDIA Nemotron 3 Ultra
MakerMoonshot AINVIDIA
WeightsOpen weightsOpen weights
ReleasedJuly 16, 2026June 4, 2026
Context window1.05M262K
Input $/Mtok$3.00$0.60
Output $/Mtok$15.00$2.40
Coding index62.330.0
Independent measurements behind it63
Cost per solved task$0.81Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Kimi K3 better than Nemotron 3 Ultra for coding?

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 30.0 for Nemotron 3 Ultra. Pick Nemotron 3 Ultra for output tokens 6.3x cheaper ($2.40 vs $15.00 per million).

Which is cheaper, Kimi K3 or Nemotron 3 Ultra?

Kimi K3 costs $3.00 per million input tokens and $15.00 per million output tokens; Nemotron 3 Ultra costs $0.60 and $2.40. Cost per solved task is known for Kimi K3 only.

Which has the bigger context window, Kimi K3 or Nemotron 3 Ultra?

Kimi K3, with 1.05M tokens against 262K.

How many benchmarks is the Kimi K3 vs Nemotron 3 Ultra comparison based on?

67 benchmarks have a result for both models as of October 22, 2026. Kimi K3's coding index rests on 6 independent benchmarks and Nemotron 3 Ultra's on 3. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/kimi-k3-vs-nvidia-nemotron-3-ultra-550b-a55b">LLMBenchmark.ai, Kimi K3 vs Nemotron 3 Ultra</a></p>