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Kimi K2.5 vs Muse Spark 1.3

Muse Spark 1.3 leads Kimi K2.5 on coding, 57.4 to 38.6 on the Vibe Coding Index, and Kimi K2.5 costs 1.5x less per output token ($2.85 vs $4.25 per million). Updated October 22, 2026; 65 benchmarks have a result for both.

Replace Kimi K2.5 Replace Muse Spark 1.3
Kimi K2.5Moonshot AI
Coding
38.6
Overall
44.8
Output $/M
$2.85
1
Muse Spark 1.3Meta
Coding
57.4
Overall
68.6
Output $/M
$4.25
64
vs boards won of 65 shared

Kimi K2.5 or Muse Spark 1.3: which to pick

Pick Muse Spark 1.3 for coding: it scores 57.4 on the Vibe Coding Index against 38.6 for Kimi K2.5.

Pick Kimi K2.5 for output tokens 1.5x cheaper ($2.85 vs $4.25 per million) and work measured by LMArena Vision: homework, where it leads.

Model AKimi K2.5Moonshot AI38.6/1003 independent benchmarks$0.24 per solved taskModel BMuse Spark 1.3Meta57.4/1004 independent benchmarksNo cost per solved task
Shared results
65
Kimi K2.5 only
34
Muse Spark 1.3 only
27
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 K2.5 38.6 from 3 benchmarks, Muse Spark 1.3 57.4 from 4 benchmarks.
Widest category
Coding, 27.4 points apart on average over 11 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Kimi K2.5 17.5% against Muse Spark 1.3 82.9%, 65.3 points apart on a 0 to 100 scale.
Output price
Kimi K2.5 $2.85 against Muse Spark 1.3 $4.25 per million output tokens, 1.5x apart.
Context window
Kimi K2.5 takes 262K tokens, Muse Spark 1.3 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
CategoryKimi K2.5BarsMuse Spark 1.3Ties
Coding011
Intelligence02
Agentic work07
Reasoning16
Math02
Knowledge04
Web design08
General024
All shared boards164
CodingLike-for-likeSix of these boards feed the Vibe Coding Index011
Coding benchmarks for Kimi K2.5 and Muse Spark 1.3
BenchmarkKimi K2.5Muse Spark 1.3Leader
SWE-bench Verified70.8%Not measuredOnly Kimi K2.5 measured
SWE-bench Multilingual67.3%Not measuredOnly Kimi K2.5 measured
LiveBench codingNot measured90.2%Only Muse Spark 1.3 measured
LMArena WebDev14371659Muse Spark 1.3
AA Coding Index46.875.8Muse Spark 1.3
LiveCodeBench (Vals AI)83.9%Not measuredOnly Kimi K2.5 measured
SWE-bench Verified (Vals AI)70.0%Not measuredOnly Kimi K2.5 measured
Terminal-Bench 4 (Vals AI)Not measured10.6%Only Muse Spark 1.3 measured
Vibe Code Bench (Vals AI)17.5%82.9%Muse Spark 1.3
Code migration (Vals AI)7.0%27.6%Muse Spark 1.3
ProgramBench (Vals AI)Not measured0.5%Only Muse Spark 1.3 measured
IOI (Vals AI)Not measured43.9%Only Muse Spark 1.3 measured
Terminal-Bench 2.1 (Vals AI)42.0%72.3%Muse Spark 1.3
CyberBench (Vals AI)Not measured69.4%Only Muse Spark 1.3 measured
SciCodeNot measured59.7%Only Muse Spark 1.3 measured
Terminal-Bench Hard (Artificial Analysis run)34.8%Not measuredOnly Kimi K2.5 measured
Terminal-Bench43.2%Not measuredOnly Kimi K2.5 measured
FrontierSWENot measured25.8%Only Muse Spark 1.3 measured
WeirdML45.6%Not measuredOnly Kimi K2.5 measured
ALE-Bench821.61688.3Muse Spark 1.3
LMArena Text: coding14831510Muse Spark 1.3
LMArena Text: software and IT14711511Muse Spark 1.3
LMArena WebDev: React14291672Muse Spark 1.3
LMArena WebDev: HTML14261653Muse Spark 1.3
LMArena WebDev: from an image14391640Muse Spark 1.3
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 Kimi K2.5 and Muse Spark 1.3
BenchmarkKimi K2.5Muse Spark 1.3Leader
AA Intelligence Index23.548.1Muse Spark 1.3
Epoch Capabilities Index148.1157.2Muse Spark 1.3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index07
Agentic work benchmarks for Kimi K2.5 and Muse Spark 1.3
BenchmarkKimi K2.5Muse Spark 1.3Leader
AA Agentic IndexNot measured55.5Only Muse Spark 1.3 measured
Design Arena: agents building web apps11361297Muse Spark 1.3
Design Arena: agents building full-stack apps11141295Muse Spark 1.3
Design Arena: agents building mobile apps11471218Muse Spark 1.3
Design Arena: agents building Android apps1118Not measuredOnly Kimi K2.5 measured
Design Arena: agents building Godot games12191241Muse Spark 1.3
Design Arena: PowerPoint slidesNot measured1219Only Muse Spark 1.3 measured
Design Arena: spreadsheetsNot measured1062Only Muse Spark 1.3 measured
LiveBench researchNot measured68.6%Only Muse Spark 1.3 measured
LiveBench browserNot measured80.0%Only Muse Spark 1.3 measured
LiveBench long agenticNot measured40.4%Only Muse Spark 1.3 measured
Finance Agent (Vals AI)35.8%58.9%Muse Spark 1.3
Tax Agent Bench (Vals AI)Not measured36.0%Only Muse Spark 1.3 measured
Legal Research Bench (Vals AI)15.9%40.9%Muse Spark 1.3
Excel Modeling Benchmark (Vals AI)28.5%62.7%Muse Spark 1.3
Terminal-Bench-Science (Vals AI)Not measured4.3%Only Muse Spark 1.3 measured
τ²-Bench Telecom95.9%Not measuredOnly Kimi K2.5 measured
APEX-AgentsNot measured58.6%Only Muse Spark 1.3 measured
OSWorld63.3%Not measuredOnly Kimi K2.5 measured
Vending-Bench 2$1,198Not measuredOnly Kimi K2.5 measured
Neither model has a result on the other 21 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index16
Reasoning benchmarks for Kimi K2.5 and Muse Spark 1.3
BenchmarkKimi K2.5Muse Spark 1.3Leader
GPQA Diamond84.1%Not measuredOnly Kimi K2.5 measured
LiveBench reasoningNot measured89.7%Only Muse Spark 1.3 measured
MMMU Pro (Vals AI)84.3%Not measuredOnly Kimi K2.5 measured
GPQA Diamond (Artificial Analysis run)87.9%94.1%Muse Spark 1.3
Humanity's Last Exam (Artificial Analysis run)30.7%48.7%Muse Spark 1.3
ARC-AGI65.3%Not measuredOnly Kimi K2.5 measured
ARC-AGI-211.8%Not measuredOnly Kimi K2.5 measured
SimpleBench46.8%Not measuredOnly Kimi K2.5 measured
Chess puzzlesNot measured37.0%Only Muse Spark 1.3 measured
Mystery game puzzlesNot measured25.0%Only Muse Spark 1.3 measured
LMArena Text: hard prompts14531503Muse Spark 1.3
LMArena Text: expert14661519Muse Spark 1.3
LMArena Text: hard prompts in English14601500Muse Spark 1.3
LMArena Vision: diagrams12821330Muse Spark 1.3
LMArena Vision: homework12971296Kimi K2.5
Kagi LLM Benchmark78.5%Not measuredOnly Kimi K2.5 measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index02
Math benchmarks for Kimi K2.5 and Muse Spark 1.3
BenchmarkKimi K2.5Muse Spark 1.3Leader
AIME95.6%Not measuredOnly Kimi K2.5 measured
OTIS Mock AIMENot measured99.2%Only Muse Spark 1.3 measured
FrontierMath, tiers 1 to 3Not measured74.4%Only Muse Spark 1.3 measured
FrontierMath, tier 4Not measured46.3%Only Muse Spark 1.3 measured
ProofBenchNot measured58.0%Only Muse Spark 1.3 measured
LMArena Text: math14701497Muse Spark 1.3
LMArena Text: mathematical work14731491Muse Spark 1.3
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index04
Knowledge benchmarks for Kimi K2.5 and Muse Spark 1.3
BenchmarkKimi K2.5Muse Spark 1.3Leader
MMLU Pro85.9%Not measuredOnly Kimi K2.5 measured
CaseLaw (Vals AI)58.7%Not measuredOnly Kimi K2.5 measured
CorpFin (Vals AI)68.3%Not measuredOnly Kimi K2.5 measured
TaxEval (Vals AI)74.2%Not measuredOnly Kimi K2.5 measured
MortgageTax (Vals AI)66.5%Not measuredOnly Kimi K2.5 measured
MedQA (Vals AI)94.4%Not measuredOnly Kimi K2.5 measured
MedCode (Vals AI)39.3%Not measuredOnly Kimi K2.5 measured
SimpleQA Verified34.3%Not measuredOnly Kimi K2.5 measured
LMArena Text: science14591507Muse Spark 1.3
LMArena Text: medicine and healthcare14481493Muse Spark 1.3
LMArena Text: legal and government14411499Muse Spark 1.3
LMArena Text: business and finance14271490Muse Spark 1.3
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for Kimi K2.5 and Muse Spark 1.3
BenchmarkKimi K2.5Muse Spark 1.3Leader
Design Arena: websites12481356Muse Spark 1.3
Design Arena: UI components12341349Muse Spark 1.3
Design Arena: game dev12061328Muse Spark 1.3
Design Arena: data viz12191343Muse Spark 1.3
Design Arena: 3D12041358Muse Spark 1.3
Design Arena: all code categories12361352Muse Spark 1.3
Design Arena: SVG11491301Muse Spark 1.3
Design Arena: ASCII art11661278Muse Spark 1.3
LiveBench designNot measured74.8%Only Muse Spark 1.3 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index024
General benchmarks for Kimi K2.5 and Muse Spark 1.3
BenchmarkKimi K2.5Muse Spark 1.3Leader
LiveBench data analysisNot measured79.6%Only Muse Spark 1.3 measured
SAGE (Vals AI)49.9%Not measuredOnly Kimi K2.5 measured
MedScribe (Vals AI)76.4%Not measuredOnly Kimi K2.5 measured
IFBench70.2%Not measuredOnly Kimi K2.5 measured
Long context reasoning (AA-LCR)78.0%83.0%Muse Spark 1.3
DTBenchNot measured96.5%Only Muse Spark 1.3 measured
LMCANot measured53.9%Only Muse Spark 1.3 measured
Fiction.LiveBench86.1%Not measuredOnly Kimi K2.5 measured
CL-bench19.3%Not measuredOnly Kimi K2.5 measured
CL-bench Life13.2%Not measuredOnly Kimi K2.5 measured
LMArena Text14451490Muse Spark 1.3
LMArena Text: instruction following14311479Muse Spark 1.3
LMArena Text: creative writing14221462Muse Spark 1.3
LMArena Vision12691308Muse Spark 1.3
LMArena Text: English14531495Muse Spark 1.3
LMArena Text: non-English14331481Muse Spark 1.3
LMArena Text: Chinese14941532Muse Spark 1.3
LMArena Text: German14411513Muse Spark 1.3
LMArena Text: Japanese14231470Muse Spark 1.3
LMArena Text: Korean14121490Muse Spark 1.3
LMArena Text: French14541511Muse Spark 1.3
LMArena Text: Spanish14501496Muse Spark 1.3
LMArena Text: Russian14351491Muse Spark 1.3
LMArena Text: Polish14451490Muse Spark 1.3
LMArena Text: multi-turn14441487Muse Spark 1.3
LMArena Text: longer queries14451488Muse Spark 1.3
LMArena Text: writing and language14251470Muse Spark 1.3
LMArena Text: entertainment and media14171457Muse Spark 1.3
LMArena Vision: English12741298Muse Spark 1.3
LMArena Vision: Chinese13281384Muse Spark 1.3
LMArena Vision: reading text12761319Muse Spark 1.3
LMArena Vision: humor12841293Muse Spark 1.3
LMArena Vision: captioning1257Not measuredOnly Kimi K2.5 measured
LMArena Vision: recognizing things1285Not measuredOnly Kimi K2.5 measured
LMArena Vision: creative writing12691296Muse Spark 1.3
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 K2.5 and Muse Spark 1.3
BenchmarkKimi K2.5Muse 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 K2.5$0.0020Fits in one request
Muse Spark 1.3$0.0034Fits in one request

Kimi K2.5 costs less

Repository review

50K input + 3K output tokens

Kimi K2.5$0.035Fits in one request
Muse Spark 1.3$0.075Fits in one request

Kimi K2.5 costs less

Agent loop

200K input + 10K output tokens

Kimi K2.5$0.135Fits in one request
Muse Spark 1.3$0.292Fits in one request

Kimi K2.5 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 K2.5 and Muse Spark 1.3
SpecificationMoonshotAI Kimi K2.5Meta Muse Spark 1.3
MakerMoonshot AIMeta
WeightsOpen weightsNo public weights listed
ReleasedJanuary 27, 2026September 2, 2026
Context window262K1.05M
Input $/Mtok$0.532$1.25
Output $/Mtok$2.85$4.25
Coding index38.657.4
Independent measurements behind it34
Cost per solved task$0.24Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Kimi K2.5 better than Muse Spark 1.3 for coding?

Pick Muse Spark 1.3 for coding: it scores 57.4 on the Vibe Coding Index against 38.6 for Kimi K2.5. Pick Kimi K2.5 for output tokens 1.5x cheaper ($2.85 vs $4.25 per million) and work measured by LMArena Vision: homework, where it leads.

Which is cheaper, Kimi K2.5 or Muse Spark 1.3?

Kimi K2.5 costs $0.532 per million input tokens and $2.85 per million output tokens; Muse Spark 1.3 costs $1.25 and $4.25. Cost per solved task is known for Kimi K2.5 only.

Which has the bigger context window, Kimi K2.5 or Muse Spark 1.3?

Muse Spark 1.3, with 1.05M tokens against 262K.

How many benchmarks is the Kimi K2.5 vs Muse Spark 1.3 comparison based on?

65 benchmarks have a result for both models as of October 22, 2026. Kimi K2.5's coding index rests on 3 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-k2-5-vs-meta-muse-spark-1-3">LLMBenchmark.ai, Kimi K2.5 vs Muse Spark 1.3</a></p>