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Claude Sonnet 5 vs Muse Spark 1.1

Muse Spark 1.1 leads Claude Sonnet 5 on coding, 70.3 to 57.7 on the Vibe Coding Index, and Muse Spark 1.1 costs 2.4x less per output token ($4.25 vs $10.00 per million). Updated October 22, 2026; 95 benchmarks have a result for both.

Replace Claude Sonnet 5 Replace Muse Spark 1.1
Claude Sonnet 5Anthropic
Coding
57.7
Overall
63.2
Output $/M
$10.00
38
Muse Spark 1.1Meta
Coding
70.3
Overall
67.0
Output $/M
$4.25
56
vs boards won of 95 shared, 1 tied

Claude Sonnet 5 or Muse Spark 1.1: which to pick

Pick Muse Spark 1.1 for coding: it scores 70.3 on the Vibe Coding Index against 57.7 for Claude Sonnet 5, though on 3 benchmarks against 6.

Pick Claude Sonnet 5 for work measured by AA Coding Index or Vibe Code Bench (Vals AI), where it leads.

Model AClaude Sonnet 5Anthropic57.7/1006 independent benchmarks$1.87 per solved taskModel BMuse Spark 1.1Meta70.3/1003 independent benchmarks$0.43 per solved task
Shared results
95
Claude Sonnet 5 only
26
Muse Spark 1.1 only
1
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
Claude Sonnet 5 57.7 from 6 benchmarks, Muse Spark 1.1 70.3 from 3 benchmarks.
Widest category
Math, 13.8 points apart on average over 3 shared benchmarks.
Widest single gap
ProofBench: Claude Sonnet 5 77.0% against Muse Spark 1.1 39.0%, 38.0 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 5 $10.00 against Muse Spark 1.1 $4.25 per million output tokens, 2.4x apart.
Context window
Claude Sonnet 5 takes 1M tokens, Muse Spark 1.1 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
CategoryClaude Sonnet 5BarsMuse Spark 1.1Ties
Coding681 tie
Intelligence20
Agentic work132
Reasoning46
Math12
Knowledge19
Web design35
General824
All shared boards38561 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index68
Coding benchmarks for Claude Sonnet 5 and Muse Spark 1.1
BenchmarkClaude Sonnet 5Muse Spark 1.1Leader
LiveBench coding74.7%Not measuredOnly Claude Sonnet 5 measured
LMArena WebDev15401542Muse Spark 1.1
AA Coding Index71.571.3Claude Sonnet 5
LiveCodeBench (Vals AI)82.4%85.9%Muse Spark 1.1
SWE-bench Verified (Vals AI)79.6%82.0%Muse Spark 1.1
Terminal-Bench 4 (Vals AI)10.6%Not measuredOnly Claude Sonnet 5 measured
Vibe Code Bench (Vals AI)81.3%72.2%Claude Sonnet 5
Code migration (Vals AI)44.4%31.1%Claude Sonnet 5
ProgramBench (Vals AI)0.0%0.0%Tie
IOI (Vals AI)45.0%Not measuredOnly Claude Sonnet 5 measured
Terminal-Bench 2.1 (Vals AI)74.5%69.3%Claude Sonnet 5
Vibe Code Bench 1-100 (Vals AI)13.8%Not measuredOnly Claude Sonnet 5 measured
SkillsBench (Vals AI)46.5%59.2%Muse Spark 1.1
CyberBench (Vals AI)70.3%Not measuredOnly Claude Sonnet 5 measured
SciCode54.3%58.8%Muse Spark 1.1
FrontierCode42.7%Not measuredOnly Claude Sonnet 5 measured
GSO-Bench37.3%Not measuredOnly Claude Sonnet 5 measured
WeirdML68.8%Not measuredOnly Claude Sonnet 5 measured
ALE-Bench1463.1Not measuredOnly Claude Sonnet 5 measured
LMArena Text: coding14831498Muse Spark 1.1
LMArena Text: software and IT14741498Muse Spark 1.1
LMArena WebDev: React15411532Claude Sonnet 5
LMArena WebDev: HTML15271540Muse Spark 1.1
LMArena WebDev: from an image15401540Claude Sonnet 5
SciCode10.7%Not measuredOnly Claude Sonnet 5 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 Claude Sonnet 5 and Muse Spark 1.1
BenchmarkClaude Sonnet 5Muse Spark 1.1Leader
AA Intelligence Index38.233.7Claude Sonnet 5
Epoch Capabilities Index156.9154.1Claude Sonnet 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index132
Agentic work benchmarks for Claude Sonnet 5 and Muse Spark 1.1
BenchmarkClaude Sonnet 5Muse Spark 1.1Leader
AA Agentic Index43.625.8Claude Sonnet 5
Design Arena: agents building web apps12451207Claude Sonnet 5
Design Arena: agents building full-stack apps12491199Claude Sonnet 5
Design Arena: agents building mobile apps12141175Claude Sonnet 5
Design Arena: agents building Android apps12271178Claude Sonnet 5
Design Arena: agents building Godot games12251103Claude Sonnet 5
Design Arena: agents building games12271183Claude Sonnet 5
Design Arena: HTML slides11681145Claude Sonnet 5
Design Arena: PowerPoint slides11931134Claude Sonnet 5
Design Arena: spreadsheets10771021Claude Sonnet 5
LiveBench research82.8%Not measuredOnly Claude Sonnet 5 measured
LiveBench browser72.0%Not measuredOnly Claude Sonnet 5 measured
LiveBench long agentic39.0%Not measuredOnly Claude Sonnet 5 measured
SREBench (Vals AI)0.4%Not measuredOnly Claude Sonnet 5 measured
Finance Agent (Vals AI)53.9%57.2%Muse Spark 1.1
Tax Agent Bench (Vals AI)29.4%Not measuredOnly Claude Sonnet 5 measured
Legal Research Bench (Vals AI)41.8%38.0%Claude Sonnet 5
Excel Modeling Benchmark (Vals AI)66.3%56.4%Claude Sonnet 5
Terminal-Bench-Science (Vals AI)5.7%Not measuredOnly Claude Sonnet 5 measured
Time Horizon Index (Vals AI)Not measured1.7%Only Muse Spark 1.1 measured
APEX-Agents54.5%31.8%Claude Sonnet 5
Vending-Bench 2$6,378$6,520Muse Spark 1.1
Neither model has a result on the other 19 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index46
Reasoning benchmarks for Claude Sonnet 5 and Muse Spark 1.1
BenchmarkClaude Sonnet 5Muse Spark 1.1Leader
GPQA Diamond88.9%91.2%Muse Spark 1.1
LiveBench reasoning88.7%Not measuredOnly Claude Sonnet 5 measured
MMMU Pro (Vals AI)83.0%86.6%Muse Spark 1.1
GPQA Diamond (Artificial Analysis run)91.1%89.8%Claude Sonnet 5
Humanity's Last Exam (Artificial Analysis run)41.3%46.2%Muse Spark 1.1
GPQA Diamond (Epoch AI run)90.5%Not measuredOnly Claude Sonnet 5 measured
SimpleBench60.6%Not measuredOnly Claude Sonnet 5 measured
Chess puzzles45.0%34.0%Claude Sonnet 5
Mystery game puzzles35.0%Not measuredOnly Claude Sonnet 5 measured
LMArena Text: hard prompts14611485Muse Spark 1.1
LMArena Text: expert14891478Claude Sonnet 5
LMArena Text: hard prompts in English14641480Muse Spark 1.1
LMArena Vision: diagrams12931305Muse Spark 1.1
LMArena Vision: homework13111287Claude Sonnet 5
Neither model has a result on the other 8 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index12
Math benchmarks for Claude Sonnet 5 and Muse Spark 1.1
BenchmarkClaude Sonnet 5Muse Spark 1.1Leader
OTIS Mock AIME94.7%Not measuredOnly Claude Sonnet 5 measured
FrontierMath, tiers 1 to 365.6%Not measuredOnly Claude Sonnet 5 measured
FrontierMath, tier 429.3%Not measuredOnly Claude Sonnet 5 measured
ProofBench77.0%39.0%Claude Sonnet 5
LMArena Text: math14671482Muse Spark 1.1
LMArena Text: mathematical work14811487Muse Spark 1.1
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index19
Knowledge benchmarks for Claude Sonnet 5 and Muse Spark 1.1
BenchmarkClaude Sonnet 5Muse Spark 1.1Leader
MMLU Pro87.5%88.7%Muse Spark 1.1
LegalBench (Vals AI)83.9%85.0%Muse Spark 1.1
CorpFin (Vals AI)67.0%71.3%Muse Spark 1.1
TaxEval (Vals AI)75.6%79.7%Muse Spark 1.1
MortgageTax (Vals AI)70.0%66.1%Claude Sonnet 5
MedCode (Vals AI)47.5%Not measuredOnly Claude Sonnet 5 measured
SimpleQA Verified33.7%57.8%Muse Spark 1.1
LMArena Text: science14601484Muse Spark 1.1
LMArena Text: medicine and healthcare14421479Muse Spark 1.1
LMArena Text: legal and government14541481Muse Spark 1.1
LMArena Text: business and finance14361470Muse Spark 1.1
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index35
Web design benchmarks for Claude Sonnet 5 and Muse Spark 1.1
BenchmarkClaude Sonnet 5Muse Spark 1.1Leader
Design Arena: websites12741270Claude Sonnet 5
Design Arena: UI components12771287Muse Spark 1.1
Design Arena: game dev12761269Claude Sonnet 5
Design Arena: data viz12521267Muse Spark 1.1
Design Arena: 3D12601259Claude Sonnet 5
Design Arena: all code categories12751276Muse Spark 1.1
Design Arena: SVG11921234Muse Spark 1.1
Design Arena: ASCII art12071269Muse Spark 1.1
LiveBench design82.0%Not measuredOnly Claude Sonnet 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index824
General benchmarks for Claude Sonnet 5 and Muse Spark 1.1
BenchmarkClaude Sonnet 5Muse Spark 1.1Leader
LiveBench data analysis71.7%Not measuredOnly Claude Sonnet 5 measured
Public Benefits Bench (Vals AI)66.0%61.3%Claude Sonnet 5
SAGE (Vals AI)48.9%45.6%Claude Sonnet 5
MedScribe (Vals AI)76.0%88.9%Muse Spark 1.1
Vals Multimodal Index68.8%66.7%Claude Sonnet 5
Long context reasoning (AA-LCR)82.0%77.7%Claude Sonnet 5
DTBench92.5%94.4%Muse Spark 1.1
LMCA50.0%49.9%Claude Sonnet 5
Surface Evolver Bench60.0%52.5%Claude Sonnet 5
LMArena Text14421478Muse Spark 1.1
LMArena Text: instruction following14521457Muse Spark 1.1
LMArena Text: creative writing14161435Muse Spark 1.1
LMArena Vision12731293Muse Spark 1.1
LMArena Text: English14501478Muse Spark 1.1
LMArena Text: non-English14311471Muse Spark 1.1
LMArena Text: Chinese14781515Muse Spark 1.1
LMArena Text: German14421469Muse Spark 1.1
LMArena Text: Japanese14221450Muse Spark 1.1
LMArena Text: Korean14121459Muse Spark 1.1
LMArena Text: French14631492Muse Spark 1.1
LMArena Text: Spanish14381464Muse Spark 1.1
LMArena Text: Russian14501482Muse Spark 1.1
LMArena Text: Polish14251499Muse Spark 1.1
LMArena Text: multi-turn14531484Muse Spark 1.1
LMArena Text: longer queries14621462Claude Sonnet 5
LMArena Text: writing and language14361448Muse Spark 1.1
LMArena Text: entertainment and media14111438Muse Spark 1.1
LMArena Vision: English12751292Muse Spark 1.1
LMArena Vision: Chinese13311348Muse Spark 1.1
LMArena Vision: reading text12881301Muse Spark 1.1
LMArena Vision: humor12611288Muse Spark 1.1
LMArena Vision: creative writing12461253Muse Spark 1.1
LMArena Document14661465Claude Sonnet 5
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 Claude Sonnet 5 and Muse Spark 1.1
BenchmarkClaude Sonnet 5Muse Spark 1.1Leader
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

Claude Sonnet 5$0.0070Fits in one request
Muse Spark 1.1$0.0034Fits in one request

Muse Spark 1.1 costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 5$0.130Fits in one request
Muse Spark 1.1$0.075Fits in one request

Muse Spark 1.1 costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 5$0.500Fits in one request
Muse Spark 1.1$0.292Fits in one request

Muse Spark 1.1 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 Claude Sonnet 5 and Muse Spark 1.1
SpecificationAnthropic Claude Sonnet 5Meta Muse Spark 1.1
MakerAnthropicMeta
WeightsNo public weights listedNo public weights listed
ReleasedJune 30, 2026July 16, 2026
Context window1M1.05M
Input $/Mtok$2.00$1.25
Output $/Mtok$10.00$4.25
Coding index57.770.3
Independent measurements behind it63
Cost per solved task$1.87$0.43
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 5 better than Muse Spark 1.1 for coding?

Pick Muse Spark 1.1 for coding: it scores 70.3 on the Vibe Coding Index against 57.7 for Claude Sonnet 5, though on 3 benchmarks against 6. Pick Claude Sonnet 5 for work measured by AA Coding Index or Vibe Code Bench (Vals AI), where it leads.

Which is cheaper, Claude Sonnet 5 or Muse Spark 1.1?

Claude Sonnet 5 costs $2.00 per million input tokens and $10.00 per million output tokens; Muse Spark 1.1 costs $1.25 and $4.25. Per solved SWE-bench Verified task, Claude Sonnet 5 costs $1.87 and Muse Spark 1.1 $0.43.

Which has the bigger context window, Claude Sonnet 5 or Muse Spark 1.1?

Muse Spark 1.1, with 1.05M tokens against 1M.

How many benchmarks is the Claude Sonnet 5 vs Muse Spark 1.1 comparison based on?

95 benchmarks have a result for both models as of October 22, 2026. Claude Sonnet 5's coding index rests on 6 independent benchmarks and Muse Spark 1.1's on 3. 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/claude-sonnet-5-vs-meta-muse-spark-1-1">LLMBenchmark.ai, Claude Sonnet 5 vs Muse Spark 1.1</a></p>