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Claude Sonnet 5 vs Muse Spark 1.3

Claude Sonnet 5 leads Muse Spark 1.3 on coding, 57.7 to 57.4 on the Vibe Coding Index, and Muse Spark 1.3 costs 2.4x less per output token ($4.25 vs $10.00 per million). Updated October 22, 2026; 91 benchmarks have a result for both.

Replace Claude Sonnet 5 Replace Muse Spark 1.3
Claude Sonnet 5Anthropic
Coding
57.7
Overall
63.2
Output $/M
$10.00
13
Muse Spark 1.3Meta
Coding
57.4
Overall
68.6
Output $/M
$4.25
77
vs boards won of 91 shared, 1 tied

Claude Sonnet 5 or Muse Spark 1.3: which to pick

Claude Sonnet 5 and Muse Spark 1.3 are level for coding, 57.7 against 57.4 on the Vibe Coding Index, so price and context decide.

Pick Muse Spark 1.3 for output tokens 2.4x cheaper ($4.25 vs $10.00 per million) and a larger context window (1.05M against 1M tokens). Pick Claude Sonnet 5 for work measured by Code migration (Vals AI) or IOI (Vals AI), where it leads.

Model AClaude Sonnet 5Anthropic57.7/1006 independent benchmarks$1.87 per solved taskModel BMuse Spark 1.3Meta57.4/1004 independent benchmarksNo cost per solved task
Shared results
91
Claude Sonnet 5 only
30
Muse Spark 1.3 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 1.3 57.4 from 4 benchmarks.
Widest category
Web design, 9.8 points apart on average over 9 shared benchmarks.
Widest single gap
ProofBench: Claude Sonnet 5 77.0% against Muse Spark 1.3 58.0%, 19.0 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 5 $10.00 against Muse Spark 1.3 $4.25 per million output tokens, 2.4x apart.
Context window
Claude Sonnet 5 takes 1M 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
CategoryClaude Sonnet 5BarsMuse Spark 1.3Ties
Coding4121 tie
Intelligence02
Agentic work412
Reasoning37
Math15
Knowledge04
Web design18
General027
All shared boards13771 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index412
Coding benchmarks for Claude Sonnet 5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5Muse Spark 1.3Leader
LiveBench coding74.7%90.2%Muse Spark 1.3
LMArena WebDev15401659Muse Spark 1.3
AA Coding Index71.575.8Muse Spark 1.3
LiveCodeBench (Vals AI)82.4%Not measuredOnly Claude Sonnet 5 measured
SWE-bench Verified (Vals AI)79.6%Not measuredOnly Claude Sonnet 5 measured
Terminal-Bench 4 (Vals AI)10.6%10.6%Tie
Vibe Code Bench (Vals AI)81.3%82.9%Muse Spark 1.3
Code migration (Vals AI)44.4%27.6%Claude Sonnet 5
ProgramBench (Vals AI)0.0%0.5%Muse Spark 1.3
IOI (Vals AI)45.0%43.9%Claude Sonnet 5
Terminal-Bench 2.1 (Vals AI)74.5%72.3%Claude Sonnet 5
Vibe Code Bench 1-100 (Vals AI)13.8%Not measuredOnly Claude Sonnet 5 measured
SkillsBench (Vals AI)46.5%Not measuredOnly Claude Sonnet 5 measured
CyberBench (Vals AI)70.3%69.4%Claude Sonnet 5
SciCode54.3%59.7%Muse Spark 1.3
FrontierCode42.7%Not measuredOnly Claude Sonnet 5 measured
FrontierSWENot measured25.8%Only Muse Spark 1.3 measured
GSO-Bench37.3%Not measuredOnly Claude Sonnet 5 measured
WeirdML68.8%Not measuredOnly Claude Sonnet 5 measured
ALE-Bench1463.11688.3Muse Spark 1.3
LMArena Text: coding14831510Muse Spark 1.3
LMArena Text: software and IT14741511Muse Spark 1.3
LMArena WebDev: React15411672Muse Spark 1.3
LMArena WebDev: HTML15271653Muse Spark 1.3
LMArena WebDev: from an image15401640Muse Spark 1.3
SciCode10.7%Not measuredOnly Claude Sonnet 5 measured
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Sonnet 5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5Muse Spark 1.3Leader
AA Intelligence Index38.248.1Muse Spark 1.3
Epoch Capabilities Index156.9157.2Muse Spark 1.3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index412
Agentic work benchmarks for Claude Sonnet 5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5Muse Spark 1.3Leader
AA Agentic Index43.655.5Muse Spark 1.3
Design Arena: agents building web apps12451297Muse Spark 1.3
Design Arena: agents building full-stack apps12491295Muse Spark 1.3
Design Arena: agents building mobile apps12151218Muse Spark 1.3
Design Arena: agents building Android apps1227Not measuredOnly Claude Sonnet 5 measured
Design Arena: agents building Godot games12251241Muse Spark 1.3
Design Arena: agents building games1227Not measuredOnly Claude Sonnet 5 measured
Design Arena: HTML slides1168Not measuredOnly Claude Sonnet 5 measured
Design Arena: PowerPoint slides11911219Muse Spark 1.3
Design Arena: spreadsheets10351062Muse Spark 1.3
LiveBench research82.8%68.6%Claude Sonnet 5
LiveBench browser72.0%80.0%Muse Spark 1.3
LiveBench long agentic39.0%40.4%Muse Spark 1.3
SREBench (Vals AI)0.4%Not measuredOnly Claude Sonnet 5 measured
Finance Agent (Vals AI)53.9%58.9%Muse Spark 1.3
Tax Agent Bench (Vals AI)29.4%36.0%Muse Spark 1.3
Legal Research Bench (Vals AI)41.8%40.9%Claude Sonnet 5
Excel Modeling Benchmark (Vals AI)66.3%62.7%Claude Sonnet 5
Terminal-Bench-Science (Vals AI)5.7%4.3%Claude Sonnet 5
APEX-Agents54.5%58.6%Muse Spark 1.3
Vending-Bench 2$6,378Not measuredOnly Claude Sonnet 5 measured
Neither model has a result on the other 20 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index37
Reasoning benchmarks for Claude Sonnet 5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5Muse Spark 1.3Leader
GPQA Diamond88.9%Not measuredOnly Claude Sonnet 5 measured
LiveBench reasoning88.7%89.7%Muse Spark 1.3
MMMU Pro (Vals AI)83.0%Not measuredOnly Claude Sonnet 5 measured
GPQA Diamond (Artificial Analysis run)91.1%94.1%Muse Spark 1.3
Humanity's Last Exam (Artificial Analysis run)41.3%48.7%Muse Spark 1.3
GPQA Diamond (Epoch AI run)90.5%Not measuredOnly Claude Sonnet 5 measured
SimpleBench60.6%Not measuredOnly Claude Sonnet 5 measured
Chess puzzles45.0%37.0%Claude Sonnet 5
Mystery game puzzles35.0%25.0%Claude Sonnet 5
LMArena Text: hard prompts14611503Muse Spark 1.3
LMArena Text: expert14891519Muse Spark 1.3
LMArena Text: hard prompts in English14641500Muse Spark 1.3
LMArena Vision: diagrams12931330Muse Spark 1.3
LMArena Vision: homework13111296Claude Sonnet 5
Neither model has a result on the other 8 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index15
Math benchmarks for Claude Sonnet 5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5Muse Spark 1.3Leader
OTIS Mock AIME94.7%99.2%Muse Spark 1.3
FrontierMath, tiers 1 to 365.6%74.4%Muse Spark 1.3
FrontierMath, tier 429.3%46.3%Muse Spark 1.3
ProofBench77.0%58.0%Claude Sonnet 5
LMArena Text: math14671497Muse Spark 1.3
LMArena Text: mathematical work14811491Muse Spark 1.3
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index04
Knowledge benchmarks for Claude Sonnet 5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5Muse Spark 1.3Leader
MMLU Pro87.5%Not measuredOnly Claude Sonnet 5 measured
LegalBench (Vals AI)83.9%Not measuredOnly Claude Sonnet 5 measured
CorpFin (Vals AI)67.0%Not measuredOnly Claude Sonnet 5 measured
TaxEval (Vals AI)75.6%Not measuredOnly Claude Sonnet 5 measured
MortgageTax (Vals AI)70.0%Not measuredOnly Claude Sonnet 5 measured
MedCode (Vals AI)47.5%Not measuredOnly Claude Sonnet 5 measured
SimpleQA Verified33.7%Not measuredOnly Claude Sonnet 5 measured
LMArena Text: science14601507Muse Spark 1.3
LMArena Text: medicine and healthcare14421493Muse Spark 1.3
LMArena Text: legal and government14541499Muse Spark 1.3
LMArena Text: business and finance14361490Muse Spark 1.3
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index18
Web design benchmarks for Claude Sonnet 5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5Muse Spark 1.3Leader
Design Arena: websites12741356Muse Spark 1.3
Design Arena: UI components12771349Muse Spark 1.3
Design Arena: game dev12771328Muse Spark 1.3
Design Arena: data viz12511343Muse Spark 1.3
Design Arena: 3D12611358Muse Spark 1.3
Design Arena: all code categories12751352Muse Spark 1.3
Design Arena: SVG11921301Muse Spark 1.3
Design Arena: ASCII art12071278Muse Spark 1.3
LiveBench design82.0%74.8%Claude Sonnet 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index027
General benchmarks for Claude Sonnet 5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5Muse Spark 1.3Leader
LiveBench data analysis71.7%79.6%Muse Spark 1.3
Public Benefits Bench (Vals AI)66.0%Not measuredOnly Claude Sonnet 5 measured
SAGE (Vals AI)48.9%Not measuredOnly Claude Sonnet 5 measured
MedScribe (Vals AI)76.0%Not measuredOnly Claude Sonnet 5 measured
Vals Multimodal Index68.8%Not measuredOnly Claude Sonnet 5 measured
Long context reasoning (AA-LCR)82.0%83.0%Muse Spark 1.3
DTBench92.5%96.5%Muse Spark 1.3
LMCA50.0%53.9%Muse Spark 1.3
Surface Evolver Bench60.0%Not measuredOnly Claude Sonnet 5 measured
LMArena Text14421490Muse Spark 1.3
LMArena Text: instruction following14521479Muse Spark 1.3
LMArena Text: creative writing14161462Muse Spark 1.3
LMArena Vision12731308Muse Spark 1.3
LMArena Text: English14501495Muse Spark 1.3
LMArena Text: non-English14311481Muse Spark 1.3
LMArena Text: Chinese14781532Muse Spark 1.3
LMArena Text: German14421513Muse Spark 1.3
LMArena Text: Japanese14221470Muse Spark 1.3
LMArena Text: Korean14121490Muse Spark 1.3
LMArena Text: French14631511Muse Spark 1.3
LMArena Text: Spanish14381496Muse Spark 1.3
LMArena Text: Russian14501491Muse Spark 1.3
LMArena Text: Polish14251490Muse Spark 1.3
LMArena Text: multi-turn14531487Muse Spark 1.3
LMArena Text: longer queries14621488Muse Spark 1.3
LMArena Text: writing and language14361470Muse Spark 1.3
LMArena Text: entertainment and media14111457Muse Spark 1.3
LMArena Vision: English12751298Muse Spark 1.3
LMArena Vision: Chinese13311384Muse Spark 1.3
LMArena Vision: reading text12881319Muse Spark 1.3
LMArena Vision: humor12611293Muse Spark 1.3
LMArena Vision: creative writing12461296Muse Spark 1.3
LMArena Document1466Not measuredOnly Claude Sonnet 5 measured
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 1.3
BenchmarkClaude Sonnet 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

Claude Sonnet 5$0.0070Fits in one request
Muse Spark 1.3$0.0034Fits in one request

Muse Spark 1.3 costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 5$0.130Fits in one request
Muse Spark 1.3$0.075Fits in one request

Muse Spark 1.3 costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 5$0.500Fits in one request
Muse Spark 1.3$0.292Fits in one request

Muse Spark 1.3 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 1.3
SpecificationAnthropic Claude Sonnet 5Meta Muse Spark 1.3
MakerAnthropicMeta
WeightsNo public weights listedNo public weights listed
ReleasedJune 30, 2026September 2, 2026
Context window1M1.05M
Input $/Mtok$2.00$1.25
Output $/Mtok$10.00$4.25
Coding index57.757.4
Independent measurements behind it64
Cost per solved task$1.87Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 5 better than Muse Spark 1.3 for coding?

Claude Sonnet 5 and Muse Spark 1.3 are level for coding, 57.7 against 57.4 on the Vibe Coding Index, so price and context decide. Pick Muse Spark 1.3 for output tokens 2.4x cheaper ($4.25 vs $10.00 per million) and a larger context window (1.05M against 1M tokens). Pick Claude Sonnet 5 for work measured by Code migration (Vals AI) or IOI (Vals AI), where it leads.

Which is cheaper, Claude Sonnet 5 or Muse Spark 1.3?

Claude Sonnet 5 costs $2.00 per million input tokens and $10.00 per million output tokens; Muse Spark 1.3 costs $1.25 and $4.25. Cost per solved task is known for Claude Sonnet 5 only.

Which has the bigger context window, Claude Sonnet 5 or Muse Spark 1.3?

Muse Spark 1.3, with 1.05M tokens against 1M.

How many benchmarks is the Claude Sonnet 5 vs Muse Spark 1.3 comparison based on?

91 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 1.3'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/claude-sonnet-5-vs-meta-muse-spark-1-3">LLMBenchmark.ai, Claude Sonnet 5 vs Muse Spark 1.3</a></p>