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Kimi K3 vs Muse Spark 1.1

Muse Spark 1.1 leads Kimi K3 on coding, 70.3 to 62.3 on the Vibe Coding Index, and Muse Spark 1.1 costs 3.5x less per output token ($4.25 vs $15.00 per million). Updated October 22, 2026; 85 benchmarks have a result for both.

Replace Kimi K3 Replace Muse Spark 1.1
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
73
Muse Spark 1.1Meta
Coding
70.3
Overall
67.0
Output $/M
$4.25
12
vs boards won of 85 shared

Kimi K3 or Muse Spark 1.1: which to pick

Pick Muse Spark 1.1 for coding: it scores 70.3 on the Vibe Coding Index against 62.3 for Kimi K3, though on 3 benchmarks against 6.

Pick Kimi K3 for work measured by LMArena WebDev or AA Coding Index, where it leads.

Model AKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved taskModel BMuse Spark 1.1Meta70.3/1003 independent benchmarks$0.43 per solved task
Shared results
85
Kimi K3 only
32
Muse Spark 1.1 only
11
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, Muse Spark 1.1 70.3 from 3 benchmarks.
Widest category
Math, 17.7 points apart on average over 3 shared benchmarks.
Widest single gap
ProofBench: Kimi K3 87.0% against Muse Spark 1.1 39.0%, 48.0 points apart on a 0 to 100 scale.
Output price
Kimi K3 $15.00 against Muse Spark 1.1 $4.25 per million output tokens, 3.5x apart.
Context window
Both take 1.05M tokens.

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 K3BarsMuse Spark 1.1Ties
Coding131
Intelligence20
Agentic work142
Reasoning80
Math30
Knowledge64
Web design70
General205
All shared boards7312
CodingLike-for-likeSix of these boards feed the Vibe Coding Index131
Coding benchmarks for Kimi K3 and Muse Spark 1.1
BenchmarkKimi K3Muse Spark 1.1Leader
LiveBench coding59.3%Not measuredOnly Kimi K3 measured
LMArena WebDev16551542Kimi K3
AA Coding Index76.271.3Kimi K3
LiveCodeBench (Vals AI)87.2%85.9%Kimi K3
SWE-bench Verified (Vals AI)93.4%82.0%Kimi K3
Terminal-Bench 4 (Vals AI)17.2%Not measuredOnly Kimi K3 measured
Vibe Code Bench (Vals AI)85.0%72.2%Kimi K3
Code migration (Vals AI)16.1%31.1%Muse Spark 1.1
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%69.3%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
SkillsBench (Vals AI)Not measured59.2%Only Muse Spark 1.1 measured
CyberBench (Vals AI)75.2%Not measuredOnly Kimi K3 measured
SciCode59.5%58.8%Kimi K3
FrontierCode44.2%Not measuredOnly Kimi K3 measured
FrontierSWE25.9%Not measuredOnly Kimi K3 measured
WeirdML82.6%Not measuredOnly Kimi K3 measured
ALE-Bench1524.5Not measuredOnly Kimi K3 measured
LMArena Text: coding15081498Kimi K3
LMArena Text: software and IT14991498Kimi K3
LMArena WebDev: React16701532Kimi K3
LMArena WebDev: HTML16441540Kimi K3
LMArena WebDev: from an image15791540Kimi K3
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Kimi K3 and Muse Spark 1.1
BenchmarkKimi K3Muse Spark 1.1Leader
AA Intelligence Index43.633.7Kimi K3
Epoch Capabilities Index157.9154.1Kimi K3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index142
Agentic work benchmarks for Kimi K3 and Muse Spark 1.1
BenchmarkKimi K3Muse Spark 1.1Leader
AA Agentic Index50.025.8Kimi K3
Design Arena: agents building web apps12951207Kimi K3
Design Arena: agents building full-stack apps13151199Kimi K3
Design Arena: agents building mobile apps12691175Kimi K3
Design Arena: agents building Android apps12531178Kimi K3
Design Arena: agents building Godot games12231103Kimi K3
Design Arena: agents building games12521183Kimi K3
Design Arena: HTML slides12061195Kimi K3
Design Arena: PowerPoint slides12471155Kimi K3
Design Arena: spreadsheets10701042Kimi K3
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%57.2%Muse Spark 1.1
Tax Agent Bench (Vals AI)33.4%Not measuredOnly Kimi K3 measured
Legal Research Bench (Vals AI)46.1%38.0%Kimi K3
Harvey's Legal Agent Benchmark (Vals AI)12.9%Not measuredOnly Kimi K3 measured
Excel Modeling Benchmark (Vals AI)66.7%56.4%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%1.7%Kimi K3
APEX-Agents47.8%31.8%Kimi K3
PostTrainBench32.0%Not measuredOnly Kimi K3 measured
Vending-Bench 2$5,165$6,520Muse Spark 1.1
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index80
Reasoning benchmarks for Kimi K3 and Muse Spark 1.1
BenchmarkKimi K3Muse Spark 1.1Leader
GPQA Diamond92.9%91.2%Kimi K3
LiveBench reasoning90.7%Not measuredOnly Kimi K3 measured
MMMU Pro (Vals AI)88.2%86.6%Kimi K3
GPQA Diamond (Artificial Analysis run)93.5%89.8%Kimi K3
Humanity's Last Exam (Artificial Analysis run)46.9%46.2%Kimi K3
GPQA Diamond (Epoch AI run)93.1%Not measuredOnly Kimi K3 measured
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%34.0%Kimi K3
Mystery game puzzles26.0%Not measuredOnly Kimi K3 measured
LMArena Text: hard prompts14951485Kimi K3
LMArena Text: expert15201478Kimi K3
LMArena Text: hard prompts in English14961480Kimi K3
LMArena Vision: diagramsNot measured1305Only Muse Spark 1.1 measured
LMArena Vision: homeworkNot measured1287Only Muse Spark 1.1 measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for Kimi K3 and Muse Spark 1.1
BenchmarkKimi K3Muse Spark 1.1Leader
OTIS Mock AIME97.2%Not measuredOnly Kimi K3 measured
FrontierMath, tiers 1 to 372.2%Not measuredOnly Kimi K3 measured
FrontierMath, tier 439.0%Not measuredOnly Kimi K3 measured
ProofBench87.0%39.0%Kimi K3
LMArena Text: math14941482Kimi K3
LMArena Text: mathematical work15051487Kimi K3
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index64
Knowledge benchmarks for Kimi K3 and Muse Spark 1.1
BenchmarkKimi K3Muse Spark 1.1Leader
MMLU Pro88.0%88.7%Muse Spark 1.1
LegalBench (Vals AI)86.2%85.0%Kimi K3
CorpFin (Vals AI)71.6%71.3%Kimi K3
TaxEval (Vals AI)75.7%79.7%Muse Spark 1.1
MortgageTax (Vals AI)66.3%66.1%Kimi K3
MedCode (Vals AI)49.4%Not measuredOnly Kimi K3 measured
SimpleQA Verified50.6%57.8%Muse Spark 1.1
LMArena Text: science15081484Kimi K3
LMArena Text: medicine and healthcare14891479Kimi K3
LMArena Text: legal and government15031481Kimi K3
LMArena Text: business and finance14701470Muse Spark 1.1
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index70
Web design benchmarks for Kimi K3 and Muse Spark 1.1
BenchmarkKimi K3Muse Spark 1.1Leader
Design Arena: websites13341270Kimi K3
Design Arena: UI components13411289Kimi K3
Design Arena: game dev13581269Kimi K3
Design Arena: data viz13511268Kimi K3
Design Arena: 3D13871260Kimi K3
Design Arena: all code categories13601276Kimi K3
Design Arena: SVG13021235Kimi K3
Design Arena: ASCII artNot measured1271Only Muse Spark 1.1 measured
LiveBench design77.2%Not measuredOnly Kimi K3 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index205
General benchmarks for Kimi K3 and Muse Spark 1.1
BenchmarkKimi K3Muse Spark 1.1Leader
Vals Index53.0%Not measuredOnly Kimi K3 measured
LiveBench data analysis78.7%Not measuredOnly Kimi K3 measured
Public Benefits Bench (Vals AI)68.2%61.3%Kimi K3
SAGE (Vals AI)52.8%45.6%Kimi K3
MedScribe (Vals AI)88.0%88.9%Muse Spark 1.1
Vals Multimodal Index73.4%66.7%Kimi K3
Long context reasoning (AA-LCR)88.7%77.7%Kimi K3
DTBench91.2%94.4%Muse Spark 1.1
LMCA52.7%49.9%Kimi K3
Surface Evolver Bench95.0%52.5%Kimi K3
Furniture assembly34.2%Not measuredOnly Kimi K3 measured
LMArena Text14761478Muse Spark 1.1
LMArena Text: instruction following14851457Kimi K3
LMArena Text: creative writing14571435Kimi K3
LMArena VisionNot measured1293Only Muse Spark 1.1 measured
LMArena Text: English14811478Kimi K3
LMArena Text: non-English14661471Muse Spark 1.1
LMArena Text: Chinese15291515Kimi K3
LMArena Text: German14901469Kimi K3
LMArena Text: Japanese14941450Kimi K3
LMArena Text: Korean14601459Kimi K3
LMArena Text: French14921492Kimi K3
LMArena Text: Spanish14721464Kimi K3
LMArena Text: Russian14851482Kimi K3
LMArena Text: Polish14581499Muse Spark 1.1
LMArena Text: multi-turn14891484Kimi K3
LMArena Text: longer queries14941462Kimi K3
LMArena Text: writing and language14711448Kimi K3
LMArena Text: entertainment and media14531438Kimi K3
LMArena Vision: EnglishNot measured1292Only Muse Spark 1.1 measured
LMArena Vision: ChineseNot measured1348Only Muse Spark 1.1 measured
LMArena Vision: reading textNot measured1301Only Muse Spark 1.1 measured
LMArena Vision: humorNot measured1288Only Muse Spark 1.1 measured
LMArena Vision: creative writingNot measured1253Only Muse Spark 1.1 measured
LMArena DocumentNot measured1465Only Muse Spark 1.1 measured
Neither model has a result on the other 11 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Kimi K3 and Muse Spark 1.1
BenchmarkKimi K3Muse Spark 1.1Leader
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
Muse Spark 1.1$0.0034Fits in one request

Muse Spark 1.1 costs less

Repository review

50K input + 3K output tokens

Kimi K3$0.195Fits in one request
Muse Spark 1.1$0.075Fits in one request

Muse Spark 1.1 costs less

Agent loop

200K input + 10K output tokens

Kimi K3$0.750Fits in one request
Muse Spark 1.1$0.292Fits in one request

Muse Spark 1.1 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 Muse Spark 1.1
SpecificationMoonshotAI Kimi K3Meta Muse Spark 1.1
MakerMoonshot AIMeta
WeightsOpen weightsNo public weights listed
ReleasedJuly 16, 2026July 16, 2026
Context window1.05M1.05M
Input $/Mtok$3.00$1.25
Output $/Mtok$15.00$4.25
Coding index62.370.3
Independent measurements behind it63
Cost per solved task$0.81$0.43
SourceOpenRouter listingOpenRouter listing

Questions

Is Kimi K3 better than Muse Spark 1.1 for coding?

Pick Muse Spark 1.1 for coding: it scores 70.3 on the Vibe Coding Index against 62.3 for Kimi K3, though on 3 benchmarks against 6. Pick Kimi K3 for work measured by LMArena WebDev or AA Coding Index, where it leads.

Which is cheaper, Kimi K3 or Muse Spark 1.1?

Kimi K3 costs $3.00 per million input tokens and $15.00 per million output tokens; Muse Spark 1.1 costs $1.25 and $4.25. Per solved SWE-bench Verified task, Kimi K3 costs $0.81 and Muse Spark 1.1 $0.43.

Which has the bigger context window, Kimi K3 or Muse Spark 1.1?

Neither: both take 1.05M tokens.

How many benchmarks is the Kimi K3 vs Muse Spark 1.1 comparison based on?

85 benchmarks have a result for both models as of October 22, 2026. Kimi K3's coding index rests on 6 independent benchmarks and Muse Spark 1.1'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-meta-muse-spark-1-1">LLMBenchmark.ai, Kimi K3 vs Muse Spark 1.1</a></p>