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Kimi K2.5 vs Muse Spark 1.2

Updated October 21, 2026. 68 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Kimi K2.5 Replace Muse Spark 1.2
Kimi K2.5Moonshot AI
Coding
58.5
Overall
23.5
Output $/M
$2.50
2
Muse Spark 1.2Meta
Coding
65.1
Overall
39.6
Output $/M
$4.25
66
vs boards won of 68 shared

Decision reading

Pick Muse Spark 1.2 for coding: it scores 65.1 on the Vibe Coding Index against 58.5 for Kimi K2.5.

Pick Kimi K2.5 when output tokens cost 1.7x less, or when a solved task costs $0.24 against $0.64.

Model AKimi K2.5Moonshot AI58.5/1002 independent benchmarks$0.24 per solved taskModel BMuse Spark 1.2Meta65.1/1002 independent benchmarks$0.64 per solved task
Shared results
68
Kimi K2.5 only
30
Muse Spark 1.2 only
29
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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 58.5 from 2 benchmarks, Muse Spark 1.2 65.1 from 2 benchmarks.
Widest category
Coding, 20.7 points apart on average over 11 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Kimi K2.5 17.5% against Muse Spark 1.2 79.1%, 61.6 points apart on a 0 to 100 scale.
Output price
Kimi K2.5 $2.50 against Muse Spark 1.2 $4.25 per million output tokens, 1.7x apart.
Context window
Kimi K2.5 takes 262K tokens, Muse Spark 1.2 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 1.2Ties
Coding011
Intelligence02
Agentic work07
Reasoning08
Math02
Knowledge19
Web design08
General119
All shared boards266
CodingLike-for-likeFour of these boards feed the Vibe Coding Index011
Coding benchmarks for Kimi K2.5 and Muse Spark 1.2
BenchmarkKimi K2.5Muse Spark 1.2Leader
SWE-bench Verified70.8%Not measuredOnly Kimi K2.5 measured
SWE-bench Multilingual67.3%Not measuredOnly Kimi K2.5 measured
LiveBench codingNot measured78.2%Only Muse Spark 1.2 measured
LMArena WebDev14371534Muse Spark 1.2
AA Coding Index46.872.2Muse Spark 1.2
LiveCodeBench (Vals AI)83.9%Not measuredOnly Kimi K2.5 measured
SWE-bench Verified (Vals AI)70.0%86.6%Muse Spark 1.2
Terminal-Bench 4 (Vals AI)Not measured6.1%Only Muse Spark 1.2 measured
Vibe Code Bench (Vals AI)17.5%79.1%Muse Spark 1.2
Code migration (Vals AI)7.0%29.9%Muse Spark 1.2
ProgramBench (Vals AI)Not measured0.5%Only Muse Spark 1.2 measured
IOI (Vals AI)Not measured21.8%Only Muse Spark 1.2 measured
Terminal-Bench 2.1 (Vals AI)42.0%69.7%Muse Spark 1.2
SkillsBench (Vals AI)Not measured53.0%Only Muse Spark 1.2 measured
CyberBench (Vals AI)Not measured69.5%Only Muse Spark 1.2 measured
SciCodeNot measured57.4%Only Muse Spark 1.2 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 measured12.0%Only Muse Spark 1.2 measured
WeirdML45.6%60.3%Muse Spark 1.2
ALE-Bench821.6Not measuredOnly Kimi K2.5 measured
LMArena Text: coding14831505Muse Spark 1.2
LMArena Text: software and IT14711505Muse Spark 1.2
LMArena WebDev: React14291526Muse Spark 1.2
LMArena WebDev: HTML14261543Muse Spark 1.2
LMArena WebDev: from an image1439Not measuredOnly Kimi K2.5 measured
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Kimi K2.5 and Muse Spark 1.2
BenchmarkKimi K2.5Muse Spark 1.2Leader
AA Intelligence Index23.539.6Muse Spark 1.2
Epoch Capabilities Index148.1155.1Muse Spark 1.2
Agentic workLike-for-likePublic boards, shown as published, kept out of the index07
Agentic work benchmarks for Kimi K2.5 and Muse Spark 1.2
BenchmarkKimi K2.5Muse Spark 1.2Leader
AA Agentic IndexNot measured43.2Only Muse Spark 1.2 measured
Design Arena: agents building web apps11361222Muse Spark 1.2
Design Arena: agents building full-stack apps11141210Muse Spark 1.2
Design Arena: agents building mobile apps11471182Muse Spark 1.2
Design Arena: agents building Android apps11241228Muse Spark 1.2
Design Arena: agents building Godot games1219Not measuredOnly Kimi K2.5 measured
Design Arena: agents building gamesNot measured1179Only Muse Spark 1.2 measured
Design Arena: HTML slidesNot measured1135Only Muse Spark 1.2 measured
Design Arena: PowerPoint slidesNot measured1198Only Muse Spark 1.2 measured
LiveBench researchNot measured67.7%Only Muse Spark 1.2 measured
LiveBench browserNot measured36.0%Only Muse Spark 1.2 measured
LiveBench long agenticNot measured21.3%Only Muse Spark 1.2 measured
SREBench (Vals AI)Not measured0.0%Only Muse Spark 1.2 measured
Finance Agent (Vals AI)35.8%60.6%Muse Spark 1.2
Tax Agent Bench (Vals AI)Not measured32.8%Only Muse Spark 1.2 measured
Legal Research Bench (Vals AI)15.9%43.8%Muse Spark 1.2
Excel Modeling Benchmark (Vals AI)28.5%57.0%Muse Spark 1.2
BioMysteryBench (Vals AI)Not measured64.8%Only Muse Spark 1.2 measured
τ²-Bench Telecom95.9%Not measuredOnly Kimi K2.5 measured
APEX-AgentsNot measured45.4%Only Muse Spark 1.2 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 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index08
Reasoning benchmarks for Kimi K2.5 and Muse Spark 1.2
BenchmarkKimi K2.5Muse Spark 1.2Leader
GPQA Diamond84.1%Not measuredOnly Kimi K2.5 measured
LiveBench reasoningNot measured90.0%Only Muse Spark 1.2 measured
MMMU Pro (Vals AI)84.3%86.1%Muse Spark 1.2
GPQA Diamond (Artificial Analysis run)87.9%90.4%Muse Spark 1.2
Humanity's Last Exam (Artificial Analysis run)30.7%45.5%Muse Spark 1.2
ARC-AGI65.3%Not measuredOnly Kimi K2.5 measured
ARC-AGI-211.8%Not measuredOnly Kimi K2.5 measured
SimpleBench46.8%74.5%Muse Spark 1.2
Chess puzzlesNot measured27.0%Only Muse Spark 1.2 measured
LMArena Text: hard prompts14531489Muse Spark 1.2
LMArena Text: expert14661475Muse Spark 1.2
LMArena Text: hard prompts in English14601487Muse Spark 1.2
LMArena Vision: diagrams12821317Muse Spark 1.2
LMArena Vision: homework1297Not measuredOnly Kimi K2.5 measured
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index02
Math benchmarks for Kimi K2.5 and Muse Spark 1.2
BenchmarkKimi K2.5Muse Spark 1.2Leader
AIME95.6%Not measuredOnly Kimi K2.5 measured
ProofBenchNot measured43.0%Only Muse Spark 1.2 measured
LMArena Text: math14701484Muse Spark 1.2
LMArena Text: mathematical work14731480Muse Spark 1.2
Neither model has a result on the other 9 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index19
Knowledge benchmarks for Kimi K2.5 and Muse Spark 1.2
BenchmarkKimi K2.5Muse Spark 1.2Leader
MMLU Pro85.9%88.3%Muse Spark 1.2
LegalBench (Vals AI)Not measured85.3%Only Muse Spark 1.2 measured
CaseLaw (Vals AI)58.7%Not measuredOnly Kimi K2.5 measured
CorpFin (Vals AI)68.3%70.9%Muse Spark 1.2
TaxEval (Vals AI)74.2%80.4%Muse Spark 1.2
MortgageTax (Vals AI)66.5%65.4%Kimi K2.5
MedQA (Vals AI)94.4%Not measuredOnly Kimi K2.5 measured
MedCode (Vals AI)39.3%49.4%Muse Spark 1.2
SimpleQA Verified34.3%60.3%Muse Spark 1.2
LMArena Text: science14591500Muse Spark 1.2
LMArena Text: medicine and healthcare14481496Muse Spark 1.2
LMArena Text: legal and government14411517Muse Spark 1.2
LMArena Text: business and finance14271484Muse Spark 1.2
Neither model has a result on the other 4 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 1.2
BenchmarkKimi K2.5Muse Spark 1.2Leader
Design Arena: websites12491313Muse Spark 1.2
Design Arena: UI components12361300Muse Spark 1.2
Design Arena: game dev12071302Muse Spark 1.2
Design Arena: data viz12191334Muse Spark 1.2
Design Arena: 3D12051301Muse Spark 1.2
Design Arena: all code categories12361313Muse Spark 1.2
Design Arena: SVG11491285Muse Spark 1.2
Design Arena: ASCII art11651284Muse Spark 1.2
LiveBench designNot measured67.1%Only Muse Spark 1.2 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index119
General benchmarks for Kimi K2.5 and Muse Spark 1.2
BenchmarkKimi K2.5Muse Spark 1.2Leader
LiveBench data analysisNot measured76.5%Only Muse Spark 1.2 measured
Public Benefits Bench (Vals AI)Not measured68.5%Only Muse Spark 1.2 measured
SAGE (Vals AI)49.9%47.7%Kimi K2.5
MedScribe (Vals AI)76.4%90.1%Muse Spark 1.2
Vals Multimodal IndexNot measured69.8%Only Muse Spark 1.2 measured
IFBench70.2%Not measuredOnly Kimi K2.5 measured
Long context reasoning (AA-LCR)78.0%79.0%Muse Spark 1.2
DTBenchNot measured94.7%Only Muse Spark 1.2 measured
LMCANot measured48.4%Only Muse Spark 1.2 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 Text14451482Muse Spark 1.2
LMArena Text: instruction following14311462Muse Spark 1.2
LMArena Text: creative writing14221436Muse Spark 1.2
LMArena Vision12691304Muse Spark 1.2
LMArena Text: English14531483Muse Spark 1.2
LMArena Text: non-English14331476Muse Spark 1.2
LMArena Text: Chinese14941509Muse Spark 1.2
LMArena Text: German1441Not measuredOnly Kimi K2.5 measured
LMArena Text: Japanese1423Not measuredOnly Kimi K2.5 measured
LMArena Text: Korean14121462Muse Spark 1.2
LMArena Text: French14541495Muse Spark 1.2
LMArena Text: Spanish14501484Muse Spark 1.2
LMArena Text: Russian14351483Muse Spark 1.2
LMArena Text: Polish1445Not measuredOnly Kimi K2.5 measured
LMArena Text: multi-turn14441502Muse Spark 1.2
LMArena Text: longer queries14451473Muse Spark 1.2
LMArena Text: writing and language14251453Muse Spark 1.2
LMArena Text: entertainment and media14171443Muse Spark 1.2
LMArena Vision: English12741291Muse Spark 1.2
LMArena Vision: Chinese1328Not measuredOnly Kimi K2.5 measured
LMArena Vision: reading text12761313Muse Spark 1.2
LMArena Vision: humor1284Not measuredOnly Kimi K2.5 measured
LMArena Vision: captioning1257Not measuredOnly Kimi K2.5 measured
LMArena Vision: recognizing things1285Not measuredOnly Kimi K2.5 measured
LMArena Vision: creative writing1269Not measuredOnly Kimi K2.5 measured
Neither model has a result on the other 9 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 1.2
BenchmarkKimi K2.5Muse 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 K2.5$0.0018Fits in one request
Muse Spark 1.2$0.0034Fits in one request

Kimi K2.5 costs less

Repository review

50K input + 3K output tokens

Kimi K2.5$0.033Fits in one request
Muse Spark 1.2$0.075Fits in one request

Kimi K2.5 costs less

Agent loop

200K input + 10K output tokens

Kimi K2.5$0.125Fits in one request
Muse Spark 1.2$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 1.2
SpecificationMoonshotAI Kimi K2.5Meta Muse Spark 1.2
MakerMoonshot AIMeta
WeightsOpen weightsNo public weights listed
ReleasedJanuary 27, 2026August 5, 2026
Context window262K1.05M
Input $/Mtok$0.50$1.25
Output $/Mtok$2.50$4.25
Coding index58.565.1
Independent measurements behind it22
Cost per solved task$0.24$0.64
SourceOpenRouter listingOpenRouter listing

Questions

Is Kimi K2.5 better than Muse Spark 1.2 for coding?

Pick Muse Spark 1.2 for coding: it scores 65.1 on the Vibe Coding Index against 58.5 for Kimi K2.5. Pick Kimi K2.5 when output tokens cost 1.7x less, or when a solved task costs $0.24 against $0.64.

Which is cheaper, Kimi K2.5 or Muse Spark 1.2?

Kimi K2.5 costs $0.50 per million input tokens and $2.50 per million output tokens; Muse Spark 1.2 costs $1.25 and $4.25. Per solved SWE-bench Verified task, Kimi K2.5 costs $0.24 and Muse Spark 1.2 $0.64.

Which has the bigger context window, Kimi K2.5 or Muse Spark 1.2?

Muse Spark 1.2, with 1.05M tokens against 262K.

How many benchmarks is the Kimi K2.5 vs Muse Spark 1.2 comparison based on?

68 benchmarks have a result for both models as of October 21, 2026. Kimi K2.5's coding index rests on 2 independent benchmarks and Muse Spark 1.2's on 2. 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-1-2">LLMBenchmark.ai, Kimi K2.5 vs Muse Spark 1.2</a></p>