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Kimi K3 vs Muse Spark 1.3

Kimi K3 leads Muse Spark 1.3 on coding, 62.3 to 57.4 on the Vibe Coding Index, and Muse Spark 1.3 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 1.3
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
36
Muse Spark 1.3Meta
Coding
57.4
Overall
68.6
Output $/M
$4.25
47
vs boards won of 85 shared, 2 tied

Kimi K3 or Muse Spark 1.3: which to pick

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 57.4 for Muse Spark 1.3.

Pick Muse Spark 1.3 for output tokens 3.5x cheaper ($4.25 vs $15.00 per million) and work measured by LiveBench coding or LMArena WebDev, where it leads.

Model AKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved taskModel BMuse Spark 1.3Meta57.4/1004 independent benchmarksNo cost per solved task
Shared results
85
Kimi K3 only
37
Muse Spark 1.3 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 1.3 57.4 from 4 benchmarks.
Widest category
Agentic work, 8.2 points apart on average over 16 shared benchmarks.
Widest single gap
LiveBench browser: Kimi K3 16.0% against Muse Spark 1.3 80.0%, 64.0 points apart on a 0 to 100 scale.
Output price
Kimi K3 $15.00 against Muse Spark 1.3 $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 1.3Ties
Coding810
Intelligence11
Agentic work88
Reasoning351 tie
Math34
Knowledge22
Web design521 tie
General615
All shared boards36472 ties
CodingLike-for-likeSix of these boards feed the Vibe Coding Index810
Coding benchmarks for Kimi K3 and Muse Spark 1.3
BenchmarkKimi K3Muse Spark 1.3Leader
LiveBench coding59.3%90.2%Muse Spark 1.3
LMArena WebDev16551659Muse Spark 1.3
AA Coding Index76.275.8Kimi K3
LiveCodeBench (Vals AI)87.2%Not measuredOnly Kimi K3 measured
SWE-bench Verified (Vals AI)93.4%Not measuredOnly Kimi K3 measured
Terminal-Bench 4 (Vals AI)17.2%10.6%Kimi K3
Vibe Code Bench (Vals AI)85.0%82.9%Kimi K3
Code migration (Vals AI)16.1%27.6%Muse Spark 1.3
ProgramBench (Vals AI)2.0%0.5%Kimi K3
IOI (Vals AI)48.9%43.9%Kimi K3
Terminal-Bench 2.1 (Vals AI)80.9%72.3%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
CyberBench (Vals AI)75.2%69.4%Kimi K3
SciCode59.5%59.7%Muse Spark 1.3
FrontierCode44.2%Not measuredOnly Kimi K3 measured
FrontierSWE25.9%25.8%Kimi K3
WeirdML82.6%Not measuredOnly Kimi K3 measured
ALE-Bench1524.51688.3Muse Spark 1.3
LMArena Text: coding15081510Muse Spark 1.3
LMArena Text: software and IT14991511Muse Spark 1.3
LMArena WebDev: React16701672Muse Spark 1.3
LMArena WebDev: HTML16441653Muse Spark 1.3
LMArena WebDev: from an image15791640Muse Spark 1.3
SWE-Bench Pro V297.7%Not measuredOnly Kimi K3 measured
Neither model has a result on the other 18 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for Kimi K3 and Muse Spark 1.3
BenchmarkKimi K3Muse Spark 1.3Leader
AA Intelligence Index43.648.1Muse Spark 1.3
Epoch Capabilities Index157.9157.2Kimi K3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index88
Agentic work benchmarks for Kimi K3 and Muse Spark 1.3
BenchmarkKimi K3Muse Spark 1.3Leader
AA Agentic Index50.055.5Muse Spark 1.3
Design Arena: agents building web apps12951297Muse Spark 1.3
Design Arena: agents building full-stack apps13151295Kimi K3
Design Arena: agents building mobile apps12681217Kimi K3
Design Arena: agents building Android apps1252Not measuredOnly Kimi K3 measured
Design Arena: agents building Godot games12231241Muse Spark 1.3
Design Arena: agents building games1252Not measuredOnly Kimi K3 measured
Design Arena: HTML slides1196Not measuredOnly Kimi K3 measured
Design Arena: PowerPoint slides12451217Kimi K3
Design Arena: spreadsheets10961075Kimi K3
LiveBench research79.0%68.6%Kimi K3
LiveBench browser16.0%80.0%Muse Spark 1.3
LiveBench long agentic42.8%40.4%Kimi K3
Finance Agent (Vals AI)53.1%58.9%Muse Spark 1.3
Tax Agent Bench (Vals AI)33.4%36.0%Muse Spark 1.3
Legal Research Bench (Vals AI)46.1%40.9%Kimi K3
Harvey's Legal Agent Benchmark (Vals AI)12.9%Not measuredOnly Kimi K3 measured
Excel Modeling Benchmark (Vals AI)66.7%62.7%Kimi K3
BioMysteryBench (Vals AI)72.6%Not measuredOnly Kimi K3 measured
Terminal-Bench-Science (Vals AI)1.4%4.3%Muse Spark 1.3
Time Horizon Index (Vals AI)10.5%Not measuredOnly Kimi K3 measured
APEX-Agents47.8%58.6%Muse Spark 1.3
PostTrainBench32.0%Not measuredOnly Kimi K3 measured
Vending-Bench 2$5,165Not measuredOnly Kimi K3 measured
MCP Atlas82.3%Not measuredOnly Kimi K3 measured
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index35
Reasoning benchmarks for Kimi K3 and Muse Spark 1.3
BenchmarkKimi K3Muse Spark 1.3Leader
GPQA Diamond92.9%Not measuredOnly Kimi K3 measured
LiveBench reasoning90.7%89.7%Kimi K3
MMMU Pro (Vals AI)88.2%Not measuredOnly Kimi K3 measured
GPQA Diamond (Artificial Analysis run)93.5%94.1%Muse Spark 1.3
Humanity's Last Exam (Artificial Analysis run)46.9%48.7%Muse Spark 1.3
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%37.0%Tie
Mystery game puzzles26.0%25.0%Kimi K3
LMArena Text: hard prompts14951503Muse Spark 1.3
LMArena Text: expert15201519Kimi K3
LMArena Text: hard prompts in English14961500Muse Spark 1.3
LMArena Vision: diagramsNot measured1330Only Muse Spark 1.3 measured
LMArena Vision: homeworkNot measured1296Only Muse Spark 1.3 measured
Humanity's Last Exam (Scale run)22.2%25.4%Muse Spark 1.3
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index34
Math benchmarks for Kimi K3 and Muse Spark 1.3
BenchmarkKimi K3Muse Spark 1.3Leader
OTIS Mock AIME97.2%99.2%Muse Spark 1.3
FrontierMath, tiers 1 to 372.2%74.4%Muse Spark 1.3
FrontierMath, tier 439.0%46.3%Muse Spark 1.3
ProofBench87.0%58.0%Kimi K3
LMArena Text: math14941497Muse Spark 1.3
LMArena Text: mathematical work15051491Kimi K3
MathArena48.0%43.0%Kimi K3
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index22
Knowledge benchmarks for Kimi K3 and Muse Spark 1.3
BenchmarkKimi K3Muse Spark 1.3Leader
MMLU Pro88.0%Not measuredOnly Kimi K3 measured
LegalBench (Vals AI)86.2%Not measuredOnly Kimi K3 measured
CorpFin (Vals AI)71.6%Not measuredOnly Kimi K3 measured
TaxEval (Vals AI)75.7%Not measuredOnly Kimi K3 measured
MortgageTax (Vals AI)66.3%Not measuredOnly Kimi K3 measured
MedCode (Vals AI)49.4%Not measuredOnly Kimi K3 measured
SimpleQA Verified50.6%Not measuredOnly Kimi K3 measured
LMArena Text: science15081507Kimi K3
LMArena Text: medicine and healthcare14891493Muse Spark 1.3
LMArena Text: legal and government15031499Kimi K3
LMArena Text: business and finance14701490Muse Spark 1.3
PRBench FinanceNot measured59.5%Only Muse Spark 1.3 measured
PRBench LegalNot measured61.6%Only Muse Spark 1.3 measured
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index52
Web design benchmarks for Kimi K3 and Muse Spark 1.3
BenchmarkKimi K3Muse Spark 1.3Leader
Design Arena: websites13351356Muse Spark 1.3
Design Arena: UI components13401350Muse Spark 1.3
Design Arena: game dev13601328Kimi K3
Design Arena: data viz13521344Kimi K3
Design Arena: 3D13871358Kimi K3
Design Arena: all code categories13601352Kimi K3
Design Arena: SVG13011301Tie
Design Arena: ASCII artNot measured1283Only Muse Spark 1.3 measured
LiveBench design77.2%74.8%Kimi K3
GeneralLike-for-likePublic boards, shown as published, kept out of the index615
General benchmarks for Kimi K3 and Muse Spark 1.3
BenchmarkKimi K3Muse Spark 1.3Leader
Vals Index53.0%Not measuredOnly Kimi K3 measured
LiveBench data analysis78.7%79.6%Muse Spark 1.3
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
Long context reasoning (AA-LCR)88.7%83.0%Kimi K3
DTBench91.2%96.5%Muse Spark 1.3
LMCA52.7%53.9%Muse Spark 1.3
Surface Evolver Bench95.0%Not measuredOnly Kimi K3 measured
Furniture assembly34.2%Not measuredOnly Kimi K3 measured
LMArena Text14761490Muse Spark 1.3
LMArena Text: instruction following14851479Kimi K3
LMArena Text: creative writing14571462Muse Spark 1.3
LMArena VisionNot measured1308Only Muse Spark 1.3 measured
LMArena Text: English14811495Muse Spark 1.3
LMArena Text: non-English14661481Muse Spark 1.3
LMArena Text: Chinese15291532Muse Spark 1.3
LMArena Text: German14901513Muse Spark 1.3
LMArena Text: Japanese14941470Kimi K3
LMArena Text: Korean14601490Muse Spark 1.3
LMArena Text: French14921511Muse Spark 1.3
LMArena Text: Spanish14721496Muse Spark 1.3
LMArena Text: Russian14851491Muse Spark 1.3
LMArena Text: Polish14581490Muse Spark 1.3
LMArena Text: multi-turn14891487Kimi K3
LMArena Text: longer queries14941488Kimi K3
LMArena Text: writing and language14711470Kimi K3
LMArena Text: entertainment and media14531457Muse Spark 1.3
LMArena Vision: EnglishNot measured1298Only Muse Spark 1.3 measured
LMArena Vision: ChineseNot measured1384Only Muse Spark 1.3 measured
LMArena Vision: reading textNot measured1319Only Muse Spark 1.3 measured
LMArena Vision: humorNot measured1293Only Muse Spark 1.3 measured
LMArena Vision: creative writingNot measured1296Only Muse Spark 1.3 measured
EQ-Bench 41339Not measuredOnly Kimi K3 measured
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 Kimi K3 and Muse Spark 1.3
BenchmarkKimi K3Muse Spark 1.3Leader
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 1.3$0.0034Fits in one request

Muse Spark 1.3 costs less

Repository review

50K input + 3K output tokens

Kimi K3$0.195Fits in one request
Muse Spark 1.3$0.075Fits in one request

Muse Spark 1.3 costs less

Agent loop

200K input + 10K output tokens

Kimi K3$0.750Fits in one request
Muse Spark 1.3$0.292Fits in one request

Muse Spark 1.3 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 1.3
SpecificationMoonshotAI Kimi K3Meta Muse Spark 1.3
MakerMoonshot AIMeta
WeightsOpen weightsNo public weights listed
ReleasedJuly 16, 2026September 2, 2026
Context window1.05M1.05M
Input $/Mtok$3.00$1.25
Output $/Mtok$15.00$4.25
Coding index62.357.4
Independent measurements behind it64
Cost per solved task$0.81Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Kimi K3 better than Muse Spark 1.3 for coding?

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 57.4 for Muse Spark 1.3. Pick Muse Spark 1.3 for output tokens 3.5x cheaper ($4.25 vs $15.00 per million) and work measured by LiveBench coding or LMArena WebDev, where it leads.

Which is cheaper, Kimi K3 or Muse Spark 1.3?

Kimi K3 costs $3.00 per million input tokens and $15.00 per million output tokens; Muse Spark 1.3 costs $1.25 and $4.25. Cost per solved task is known for Kimi K3 only.

Which has the bigger context window, Kimi K3 or Muse Spark 1.3?

Neither: both take 1.05M tokens.

How many benchmarks is the Kimi K3 vs Muse Spark 1.3 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 1.3's on 4. 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-1-3">LLMBenchmark.ai, Kimi K3 vs Muse Spark 1.3</a></p>