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Kimi K3 vs Muse Spark 1.2

Kimi K3 leads Muse Spark 1.2 on coding, 62.3 to 55.7 on the Vibe Coding Index, and Muse Spark 1.2 costs 3.5x less per output token ($4.25 vs $15.00 per million). Updated October 22, 2026; 90 benchmarks have a result for both.

Replace Kimi K3 Replace Muse Spark 1.2
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
68
Muse Spark 1.2Meta
Coding
55.7
Overall
60.4
Output $/M
$4.25
22
vs boards won of 90 shared

Kimi K3 or Muse Spark 1.2: which to pick

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 55.7 for Muse Spark 1.2.

Pick Muse Spark 1.2 for output tokens 3.5x cheaper ($4.25 vs $15.00 per million) and a lower cost per solved task ($0.64 against $0.81).

Model AKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved taskModel BMuse Spark 1.2Meta55.7/1005 independent benchmarks$0.64 per solved task
Shared results
90
Kimi K3 only
27
Muse Spark 1.2 only
7
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 1.2 55.7 from 5 benchmarks.
Widest category
Math, 16.6 points apart on average over 3 shared benchmarks.
Widest single gap
ProofBench: Kimi K3 87.0% against Muse Spark 1.2 43.0%, 44.0 points apart on a 0 to 100 scale.
Output price
Kimi K3 $15.00 against Muse Spark 1.2 $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 1.2Ties
Coding153
Intelligence20
Agentic work152
Reasoning81
Math30
Knowledge56
Web design80
General1210
All shared boards6822
CodingLike-for-likeSix of these boards feed the Vibe Coding Index153
Coding benchmarks for Kimi K3 and Muse Spark 1.2
BenchmarkKimi K3Muse Spark 1.2Leader
LiveBench coding59.3%78.2%Muse Spark 1.2
LMArena WebDev16551534Kimi K3
AA Coding Index76.272.2Kimi K3
LiveCodeBench (Vals AI)87.2%Not measuredOnly Kimi K3 measured
SWE-bench Verified (Vals AI)93.4%86.6%Kimi K3
Terminal-Bench 4 (Vals AI)17.2%6.1%Kimi K3
Vibe Code Bench (Vals AI)85.0%79.1%Kimi K3
Code migration (Vals AI)16.1%29.9%Muse Spark 1.2
ProgramBench (Vals AI)2.0%0.5%Kimi K3
IOI (Vals AI)48.9%21.8%Kimi K3
Terminal-Bench 2.1 (Vals AI)80.9%69.7%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 measured53.0%Only Muse Spark 1.2 measured
CyberBench (Vals AI)75.2%69.5%Kimi K3
SciCode59.5%57.4%Kimi K3
FrontierCode44.2%Not measuredOnly Kimi K3 measured
FrontierSWE25.9%12.0%Kimi K3
WeirdML82.6%60.3%Kimi K3
ALE-Bench1524.5Not measuredOnly Kimi K3 measured
LMArena Text: coding15081505Kimi K3
LMArena Text: software and IT14991505Muse Spark 1.2
LMArena WebDev: React16701526Kimi K3
LMArena WebDev: HTML16441543Kimi K3
LMArena WebDev: from an image1579Not measuredOnly 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 index20
Intelligence benchmarks for Kimi K3 and Muse Spark 1.2
BenchmarkKimi K3Muse Spark 1.2Leader
AA Intelligence Index43.639.6Kimi K3
Epoch Capabilities Index157.9155.1Kimi K3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index152
Agentic work benchmarks for Kimi K3 and Muse Spark 1.2
BenchmarkKimi K3Muse Spark 1.2Leader
AA Agentic Index50.043.2Kimi K3
Design Arena: agents building web apps12951221Kimi K3
Design Arena: agents building full-stack apps13151210Kimi K3
Design Arena: agents building mobile apps12691181Kimi K3
Design Arena: agents building Android apps12531222Kimi K3
Design Arena: agents building Godot games1223Not measuredOnly Kimi K3 measured
Design Arena: agents building games12521179Kimi K3
Design Arena: HTML slides12061085Kimi K3
Design Arena: PowerPoint slides12471172Kimi K3
Design Arena: spreadsheets1070Not measuredOnly Kimi K3 measured
LiveBench research79.0%67.7%Kimi K3
LiveBench browser16.0%36.0%Muse Spark 1.2
LiveBench long agentic42.8%21.3%Kimi K3
SREBench (Vals AI)Not measured0.0%Only Muse Spark 1.2 measured
Finance Agent (Vals AI)53.1%60.6%Muse Spark 1.2
Tax Agent Bench (Vals AI)33.4%32.8%Kimi K3
Legal Research Bench (Vals AI)46.1%43.8%Kimi K3
Harvey's Legal Agent Benchmark (Vals AI)12.9%Not measuredOnly Kimi K3 measured
Excel Modeling Benchmark (Vals AI)66.7%57.0%Kimi K3
BioMysteryBench (Vals AI)72.6%64.8%Kimi K3
Terminal-Bench-Science (Vals AI)1.4%Not measuredOnly Kimi K3 measured
Time Horizon Index (Vals AI)10.5%Not measuredOnly Kimi K3 measured
APEX-Agents47.8%45.4%Kimi K3
PostTrainBench32.0%Not measuredOnly Kimi K3 measured
Vending-Bench 2$5,165Not measuredOnly 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 index81
Reasoning benchmarks for Kimi K3 and Muse Spark 1.2
BenchmarkKimi K3Muse Spark 1.2Leader
GPQA Diamond92.9%Not measuredOnly Kimi K3 measured
LiveBench reasoning90.7%90.0%Kimi K3
MMMU Pro (Vals AI)88.2%86.1%Kimi K3
GPQA Diamond (Artificial Analysis run)93.5%90.4%Kimi K3
Humanity's Last Exam (Artificial Analysis run)46.9%45.5%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%74.5%Muse Spark 1.2
Chess puzzles37.0%27.0%Kimi K3
Mystery game puzzles26.0%Not measuredOnly Kimi K3 measured
LMArena Text: hard prompts14951489Kimi K3
LMArena Text: expert15201475Kimi K3
LMArena Text: hard prompts in English14961487Kimi K3
LMArena Vision: diagramsNot measured1317Only Muse Spark 1.2 measured
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for Kimi K3 and Muse Spark 1.2
BenchmarkKimi K3Muse Spark 1.2Leader
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%43.0%Kimi K3
LMArena Text: math14941484Kimi K3
LMArena Text: mathematical work15051480Kimi K3
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index56
Knowledge benchmarks for Kimi K3 and Muse Spark 1.2
BenchmarkKimi K3Muse Spark 1.2Leader
MMLU Pro88.0%88.3%Muse Spark 1.2
LegalBench (Vals AI)86.2%85.3%Kimi K3
CorpFin (Vals AI)71.6%70.9%Kimi K3
TaxEval (Vals AI)75.7%80.4%Muse Spark 1.2
MortgageTax (Vals AI)66.3%65.4%Kimi K3
MedCode (Vals AI)49.4%49.4%Kimi K3
SimpleQA Verified50.6%60.3%Muse Spark 1.2
LMArena Text: science15081500Kimi K3
LMArena Text: medicine and healthcare14891496Muse Spark 1.2
LMArena Text: legal and government15031517Muse Spark 1.2
LMArena Text: business and finance14701484Muse Spark 1.2
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Kimi K3 and Muse Spark 1.2
BenchmarkKimi K3Muse Spark 1.2Leader
Design Arena: websites13341312Kimi K3
Design Arena: UI components13411298Kimi K3
Design Arena: game dev13581301Kimi K3
Design Arena: data viz13511334Kimi K3
Design Arena: 3D13871301Kimi K3
Design Arena: all code categories13601312Kimi K3
Design Arena: SVG13021284Kimi K3
Design Arena: ASCII artNot measured1284Only Muse Spark 1.2 measured
LiveBench design77.2%67.1%Kimi K3
GeneralLike-for-likePublic boards, shown as published, kept out of the index1210
General benchmarks for Kimi K3 and Muse Spark 1.2
BenchmarkKimi K3Muse Spark 1.2Leader
Vals Index53.0%Not measuredOnly Kimi K3 measured
LiveBench data analysis78.7%76.5%Kimi K3
Public Benefits Bench (Vals AI)68.2%68.5%Muse Spark 1.2
SAGE (Vals AI)52.8%47.7%Kimi K3
MedScribe (Vals AI)88.0%90.1%Muse Spark 1.2
Vals Multimodal Index73.4%69.8%Kimi K3
Long context reasoning (AA-LCR)88.7%79.0%Kimi K3
DTBench91.2%94.7%Muse Spark 1.2
LMCA52.7%48.4%Kimi K3
Surface Evolver Bench95.0%Not measuredOnly Kimi K3 measured
Furniture assembly34.2%Not measuredOnly Kimi K3 measured
LMArena Text14761482Muse Spark 1.2
LMArena Text: instruction following14851462Kimi K3
LMArena Text: creative writing14571436Kimi K3
LMArena VisionNot measured1304Only Muse Spark 1.2 measured
LMArena Text: English14811483Muse Spark 1.2
LMArena Text: non-English14661476Muse Spark 1.2
LMArena Text: Chinese15291509Kimi K3
LMArena Text: German1490Not measuredOnly Kimi K3 measured
LMArena Text: Japanese1494Not measuredOnly Kimi K3 measured
LMArena Text: Korean14601462Muse Spark 1.2
LMArena Text: French14921495Muse Spark 1.2
LMArena Text: Spanish14721484Muse Spark 1.2
LMArena Text: Russian14851483Kimi K3
LMArena Text: Polish1458Not measuredOnly Kimi K3 measured
LMArena Text: multi-turn14891502Muse Spark 1.2
LMArena Text: longer queries14941473Kimi K3
LMArena Text: writing and language14711453Kimi K3
LMArena Text: entertainment and media14531443Kimi K3
LMArena Vision: EnglishNot measured1291Only Muse Spark 1.2 measured
LMArena Vision: reading textNot measured1313Only Muse Spark 1.2 measured
Neither model has a result on the other 15 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 1.2
BenchmarkKimi K3Muse Spark 1.2Leader
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 1.2$0.0034Fits in one request

Muse Spark 1.2 costs less

Repository review

50K input + 3K output tokens

Kimi K3$0.195Fits in one request
Muse Spark 1.2$0.075Fits in one request

Muse Spark 1.2 costs less

Agent loop

200K input + 10K output tokens

Kimi K3$0.750Fits in one request
Muse Spark 1.2$0.292Fits in one request

Muse Spark 1.2 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 1.2
SpecificationMoonshotAI Kimi K3Meta Muse Spark 1.2
MakerMoonshot AIMeta
WeightsOpen weightsNo public weights listed
ReleasedJuly 16, 2026August 5, 2026
Context window1.05M1.05M
Input $/Mtok$3.00$1.25
Output $/Mtok$15.00$4.25
Coding index62.355.7
Independent measurements behind it65
Cost per solved task$0.81$0.64
SourceOpenRouter listingOpenRouter listing

Questions

Is Kimi K3 better than Muse Spark 1.2 for coding?

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 55.7 for Muse Spark 1.2. Pick Muse Spark 1.2 for output tokens 3.5x cheaper ($4.25 vs $15.00 per million) and a lower cost per solved task ($0.64 against $0.81).

Which is cheaper, Kimi K3 or Muse Spark 1.2?

Kimi K3 costs $3.00 per million input tokens and $15.00 per million output tokens; Muse Spark 1.2 costs $1.25 and $4.25. Per solved SWE-bench Verified task, Kimi K3 costs $0.81 and Muse Spark 1.2 $0.64.

Which has the bigger context window, Kimi K3 or Muse Spark 1.2?

Neither: both take 1.05M tokens.

How many benchmarks is the Kimi K3 vs Muse Spark 1.2 comparison based on?

90 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 1.2's on 5. 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-1-2">LLMBenchmark.ai, Kimi K3 vs Muse Spark 1.2</a></p>