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Muse Spark 1.2 vs Qwen3.5-Flash

Muse Spark 1.2 leads Qwen3.5-Flash on coding, 55.7 to 41.1 on the Vibe Coding Index, and Qwen3.5-Flash costs 16.3x less per output token ($0.26 vs $4.25 per million). Updated October 22, 2026; 43 benchmarks have a result for both.

Replace Muse Spark 1.2 Replace Qwen3.5-Flash
Muse Spark 1.2Meta
Coding
55.7
Overall
60.4
Output $/M
$4.25
42
Qwen3.5-FlashQwen
Coding
41.1
Overall
50.1
Output $/M
$0.26
1
vs boards won of 43 shared

Muse Spark 1.2 or Qwen3.5-Flash: which to pick

Pick Muse Spark 1.2 for coding: it scores 55.7 on the Vibe Coding Index against 41.1 for Qwen3.5-Flash.

Pick Qwen3.5-Flash for output tokens 16.3x cheaper ($0.26 vs $4.25 per million) and a lower cost per solved task ($0.40 against $0.64).

Model AMuse Spark 1.2Meta55.7/1005 independent benchmarks$0.64 per solved taskModel BQwen3.5-FlashQwen41.1/1002 independent benchmarks$0.40 per solved task
Shared results
43
Muse Spark 1.2 only
54
Qwen3.5-Flash only
12
Like-for-like categories
6 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
Muse Spark 1.2 55.7 from 5 benchmarks, Qwen3.5-Flash 41.1 from 2 benchmarks.
Widest category
Coding, 30.9 points apart on average over 6 shared benchmarks.
Widest single gap
LMArena WebDev: React: Muse Spark 1.2 1526 against Qwen3.5-Flash 1229, 49.4 points apart on a 0 to 100 scale.
Output price
Muse Spark 1.2 $4.25 against Qwen3.5-Flash $0.26 per million output tokens, 16.3x apart.
Context window
Muse Spark 1.2 takes 1.05M tokens, Qwen3.5-Flash 1M.

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
CategoryMuse Spark 1.2BarsQwen3.5-FlashTies
Coding60
Intelligence10
Reasoning50
Math20
Knowledge101
General180
All shared boards421
CodingLike-for-likeSix of these boards feed the Vibe Coding Index60
Coding benchmarks for Muse Spark 1.2 and Qwen3.5-Flash
BenchmarkMuse Spark 1.2Qwen3.5-FlashLeader
LiveBench coding78.2%Not measuredOnly Muse Spark 1.2 measured
LMArena WebDev15341244Muse Spark 1.2
AA Coding Index72.2Not measuredOnly Muse Spark 1.2 measured
LiveCodeBench (Vals AI)Not measured83.3%Only Qwen3.5-Flash measured
SWE-bench Verified (Vals AI)86.6%64.4%Muse Spark 1.2
Terminal-Bench 4 (Vals AI)6.1%Not measuredOnly Muse Spark 1.2 measured
Vibe Code Bench (Vals AI)79.1%Not measuredOnly Muse Spark 1.2 measured
Code migration (Vals AI)29.9%Not measuredOnly Muse Spark 1.2 measured
ProgramBench (Vals AI)0.5%Not measuredOnly Muse Spark 1.2 measured
IOI (Vals AI)21.8%Not measuredOnly Muse Spark 1.2 measured
Terminal-Bench 2.1 (Vals AI)69.7%Not measuredOnly Muse Spark 1.2 measured
SkillsBench (Vals AI)53.0%Not measuredOnly Muse Spark 1.2 measured
CyberBench (Vals AI)69.5%Not measuredOnly Muse Spark 1.2 measured
SciCode57.4%Not measuredOnly Muse Spark 1.2 measured
FrontierSWE12.0%Not measuredOnly Muse Spark 1.2 measured
WeirdML60.3%Not measuredOnly Muse Spark 1.2 measured
ALE-BenchNot measured265.9Only Qwen3.5-Flash measured
LMArena Text: coding15051412Muse Spark 1.2
LMArena Text: software and IT15051416Muse Spark 1.2
LMArena WebDev: React15261229Muse Spark 1.2
LMArena WebDev: HTML15431291Muse Spark 1.2
Neither model has a result on the other 22 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Muse Spark 1.2 and Qwen3.5-Flash
BenchmarkMuse Spark 1.2Qwen3.5-FlashLeader
AA Intelligence Index39.6Not measuredOnly Muse Spark 1.2 measured
Epoch Capabilities Index155.1143.5Muse Spark 1.2
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index18 boards, none shared
Agentic work benchmarks for Muse Spark 1.2 and Qwen3.5-Flash
BenchmarkMuse Spark 1.2Qwen3.5-FlashLeader
AA Agentic Index43.2Not measuredOnly Muse Spark 1.2 measured
Design Arena: agents building web apps1221Not measuredOnly Muse Spark 1.2 measured
Design Arena: agents building full-stack apps1210Not measuredOnly Muse Spark 1.2 measured
Design Arena: agents building mobile apps1181Not measuredOnly Muse Spark 1.2 measured
Design Arena: agents building Android apps1222Not measuredOnly Muse Spark 1.2 measured
Design Arena: agents building games1178Not measuredOnly Muse Spark 1.2 measured
Design Arena: HTML slides1074Not measuredOnly Muse Spark 1.2 measured
Design Arena: PowerPoint slides1170Not measuredOnly Muse Spark 1.2 measured
LiveBench research67.7%Not measuredOnly Muse Spark 1.2 measured
LiveBench browser36.0%Not measuredOnly Muse Spark 1.2 measured
LiveBench long agentic21.3%Not measuredOnly Muse Spark 1.2 measured
SREBench (Vals AI)0.0%Not measuredOnly Muse Spark 1.2 measured
Finance Agent (Vals AI)60.6%Not measuredOnly Muse Spark 1.2 measured
Tax Agent Bench (Vals AI)32.8%Not measuredOnly Muse Spark 1.2 measured
Legal Research Bench (Vals AI)43.8%Not measuredOnly Muse Spark 1.2 measured
Excel Modeling Benchmark (Vals AI)57.0%Not measuredOnly Muse Spark 1.2 measured
BioMysteryBench (Vals AI)64.8%Not measuredOnly Muse Spark 1.2 measured
APEX-Agents45.4%Not measuredOnly Muse Spark 1.2 measured
Neither model has a result on the other 24 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index50
Reasoning benchmarks for Muse Spark 1.2 and Qwen3.5-Flash
BenchmarkMuse Spark 1.2Qwen3.5-FlashLeader
GPQA DiamondNot measured82.8%Only Qwen3.5-Flash measured
LiveBench reasoning90.0%Not measuredOnly Muse Spark 1.2 measured
MMMU Pro (Vals AI)86.1%81.9%Muse Spark 1.2
GPQA Diamond (Artificial Analysis run)90.4%Not measuredOnly Muse Spark 1.2 measured
Humanity's Last Exam (Artificial Analysis run)45.5%Not measuredOnly Muse Spark 1.2 measured
GPQA Diamond (Epoch AI run)Not measured82.3%Only Qwen3.5-Flash measured
SimpleBench74.5%Not measuredOnly Muse Spark 1.2 measured
Chess puzzles27.0%14.0%Muse Spark 1.2
Mystery game puzzlesNot measured20.0%Only Qwen3.5-Flash measured
LMArena Text: hard prompts14891403Muse Spark 1.2
LMArena Text: expert14751407Muse Spark 1.2
LMArena Text: hard prompts in English14871409Muse Spark 1.2
LMArena Vision: diagrams1317Not measuredOnly Muse Spark 1.2 measured
Neither model has a result on the other 10 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for Muse Spark 1.2 and Qwen3.5-Flash
BenchmarkMuse Spark 1.2Qwen3.5-FlashLeader
AIMENot measured92.5%Only Qwen3.5-Flash measured
OTIS Mock AIMENot measured84.4%Only Qwen3.5-Flash measured
FrontierMath, tiers 1 to 3Not measured18.2%Only Qwen3.5-Flash measured
ProofBench43.0%Not measuredOnly Muse Spark 1.2 measured
LMArena Text: math14841407Muse Spark 1.2
LMArena Text: mathematical work14801413Muse Spark 1.2
Neither model has a result on the other 8 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index101
Knowledge benchmarks for Muse Spark 1.2 and Qwen3.5-Flash
BenchmarkMuse Spark 1.2Qwen3.5-FlashLeader
MMLU Pro88.3%84.1%Muse Spark 1.2
LegalBench (Vals AI)85.3%84.3%Muse Spark 1.2
CaseLaw (Vals AI)Not measured56.0%Only Qwen3.5-Flash measured
CorpFin (Vals AI)70.9%63.6%Muse Spark 1.2
TaxEval (Vals AI)80.4%72.2%Muse Spark 1.2
MortgageTax (Vals AI)65.4%67.4%Qwen3.5-Flash
MedCode (Vals AI)49.4%33.0%Muse Spark 1.2
SimpleQA Verified60.3%20.3%Muse Spark 1.2
LMArena Text: science15001415Muse Spark 1.2
LMArena Text: medicine and healthcare14961407Muse Spark 1.2
LMArena Text: legal and government15171398Muse Spark 1.2
LMArena Text: business and finance14841394Muse Spark 1.2
Neither model has a result on the other 8 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
Web design benchmarks for Muse Spark 1.2 and Qwen3.5-Flash
BenchmarkMuse Spark 1.2Qwen3.5-FlashLeader
Design Arena: websites1312Not measuredOnly Muse Spark 1.2 measured
Design Arena: UI components1299Not measuredOnly Muse Spark 1.2 measured
Design Arena: game dev1300Not measuredOnly Muse Spark 1.2 measured
Design Arena: data viz1334Not measuredOnly Muse Spark 1.2 measured
Design Arena: 3D1300Not measuredOnly Muse Spark 1.2 measured
Design Arena: all code categories1312Not measuredOnly Muse Spark 1.2 measured
Design Arena: SVG1283Not measuredOnly Muse Spark 1.2 measured
Design Arena: ASCII art1284Not measuredOnly Muse Spark 1.2 measured
LiveBench design67.1%Not measuredOnly Muse Spark 1.2 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index180
General benchmarks for Muse Spark 1.2 and Qwen3.5-Flash
BenchmarkMuse Spark 1.2Qwen3.5-FlashLeader
LiveBench data analysis76.5%Not measuredOnly Muse Spark 1.2 measured
Public Benefits Bench (Vals AI)68.5%Not measuredOnly Muse Spark 1.2 measured
SAGE (Vals AI)47.7%42.5%Muse Spark 1.2
MedScribe (Vals AI)90.1%70.6%Muse Spark 1.2
Vals Multimodal Index69.8%Not measuredOnly Muse Spark 1.2 measured
Long context reasoning (AA-LCR)79.0%Not measuredOnly Muse Spark 1.2 measured
DTBench94.7%82.9%Muse Spark 1.2
LMCA48.4%29.1%Muse Spark 1.2
LMArena Text14821397Muse Spark 1.2
LMArena Text: instruction following14621374Muse Spark 1.2
LMArena Text: creative writing14361343Muse Spark 1.2
LMArena Vision1304Not measuredOnly Muse Spark 1.2 measured
LMArena Text: English14831404Muse Spark 1.2
LMArena Text: non-English14761385Muse Spark 1.2
LMArena Text: Chinese15091445Muse Spark 1.2
LMArena Text: GermanNot measured1390Only Qwen3.5-Flash measured
LMArena Text: JapaneseNot measured1369Only Qwen3.5-Flash measured
LMArena Text: Korean14621344Muse Spark 1.2
LMArena Text: French14951413Muse Spark 1.2
LMArena Text: Spanish14841400Muse Spark 1.2
LMArena Text: Russian14831380Muse Spark 1.2
LMArena Text: PolishNot measured1376Only Qwen3.5-Flash measured
LMArena Text: multi-turn15021393Muse Spark 1.2
LMArena Text: longer queries14731392Muse Spark 1.2
LMArena Text: writing and language14531369Muse Spark 1.2
LMArena Text: entertainment and media14431347Muse Spark 1.2
LMArena Vision: English1291Not measuredOnly Muse Spark 1.2 measured
LMArena Vision: reading text1313Not measuredOnly Muse Spark 1.2 measured
Neither model has a result on the other 20 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Muse Spark 1.2 and Qwen3.5-Flash
BenchmarkMuse Spark 1.2Qwen3.5-FlashLeader
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

Muse Spark 1.2$0.0034Fits in one request
Qwen3.5-Flash$0.0002Fits in one request

Qwen3.5-Flash costs less

Repository review

50K input + 3K output tokens

Muse Spark 1.2$0.075Fits in one request
Qwen3.5-Flash$0.0040Fits in one request

Qwen3.5-Flash costs less

Agent loop

200K input + 10K output tokens

Muse Spark 1.2$0.292Fits in one request
Qwen3.5-Flash$0.016Fits in one request

Qwen3.5-Flash 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 Muse Spark 1.2 and Qwen3.5-Flash
SpecificationMeta Muse Spark 1.2Qwen3.5-Flash
MakerMetaQwen
WeightsNo public weights listedNo public weights listed
ReleasedAugust 5, 2026February 25, 2026
Context window1.05M1M
Input $/Mtok$1.25$0.065
Output $/Mtok$4.25$0.26
Coding index55.741.1
Independent measurements behind it52
Cost per solved task$0.64$0.40
SourceOpenRouter listingOpenRouter listing

Questions

Is Muse Spark 1.2 better than Qwen3.5-Flash for coding?

Pick Muse Spark 1.2 for coding: it scores 55.7 on the Vibe Coding Index against 41.1 for Qwen3.5-Flash. Pick Qwen3.5-Flash for output tokens 16.3x cheaper ($0.26 vs $4.25 per million) and a lower cost per solved task ($0.40 against $0.64).

Which is cheaper, Muse Spark 1.2 or Qwen3.5-Flash?

Muse Spark 1.2 costs $1.25 per million input tokens and $4.25 per million output tokens; Qwen3.5-Flash costs $0.065 and $0.26. Per solved SWE-bench Verified task, Muse Spark 1.2 costs $0.64 and Qwen3.5-Flash $0.40.

Which has the bigger context window, Muse Spark 1.2 or Qwen3.5-Flash?

Muse Spark 1.2, with 1.05M tokens against 1M.

How many benchmarks is the Muse Spark 1.2 vs Qwen3.5-Flash comparison based on?

43 benchmarks have a result for both models as of October 22, 2026. Muse Spark 1.2's coding index rests on 5 independent benchmarks and Qwen3.5-Flash's on 2. Where only one model has a result, the page says so instead of naming a winner.

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