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Claude Sonnet 5 vs Muse Spark 1.2

Claude Sonnet 5 leads Muse Spark 1.2 on coding, 57.7 to 55.7 on the Vibe Coding Index, and Muse Spark 1.2 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 1.2
Claude Sonnet 5Anthropic
Coding
57.7
Overall
63.2
Output $/M
$10.00
34
Muse Spark 1.2Meta
Coding
55.7
Overall
60.4
Output $/M
$4.25
61
vs boards won of 95 shared

Claude Sonnet 5 or Muse Spark 1.2: which to pick

Pick Claude Sonnet 5 for coding: it scores 57.7 on the Vibe Coding Index against 55.7 for Muse Spark 1.2.

Pick Muse Spark 1.2 for output tokens 2.4x cheaper ($4.25 vs $10.00 per million) and a lower cost per solved task ($0.64 against $1.87).

Model AClaude Sonnet 5Anthropic57.7/1006 independent benchmarks$1.87 per solved taskModel BMuse Spark 1.2Meta55.7/1005 independent benchmarks$0.64 per solved task
Shared results
95
Claude Sonnet 5 only
26
Muse Spark 1.2 only
2
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 1.2 55.7 from 5 benchmarks.
Widest category
Math, 12.3 points apart on average over 3 shared benchmarks.
Widest single gap
LiveBench browser: Claude Sonnet 5 72.0% against Muse Spark 1.2 36.0%, 36.0 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 5 $10.00 against Muse Spark 1.2 $4.25 per million output tokens, 2.4x apart.
Context window
Claude Sonnet 5 takes 1M 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
CategoryClaude Sonnet 5BarsMuse Spark 1.2Ties
Coding99
Intelligence11
Agentic work143
Reasoning37
Math21
Knowledge110
Web design18
General322
All shared boards3461
CodingLike-for-likeSix of these boards feed the Vibe Coding Index99
Coding benchmarks for Claude Sonnet 5 and Muse Spark 1.2
BenchmarkClaude Sonnet 5Muse Spark 1.2Leader
LiveBench coding74.7%78.2%Muse Spark 1.2
LMArena WebDev15401534Claude Sonnet 5
AA Coding Index71.572.2Muse Spark 1.2
LiveCodeBench (Vals AI)82.4%Not measuredOnly Claude Sonnet 5 measured
SWE-bench Verified (Vals AI)79.6%86.6%Muse Spark 1.2
Terminal-Bench 4 (Vals AI)10.6%6.1%Claude Sonnet 5
Vibe Code Bench (Vals AI)81.3%79.1%Claude Sonnet 5
Code migration (Vals AI)44.4%29.9%Claude Sonnet 5
ProgramBench (Vals AI)0.0%0.5%Muse Spark 1.2
IOI (Vals AI)45.0%21.8%Claude Sonnet 5
Terminal-Bench 2.1 (Vals AI)74.5%69.7%Claude Sonnet 5
Vibe Code Bench 1-100 (Vals AI)13.8%Not measuredOnly Claude Sonnet 5 measured
SkillsBench (Vals AI)46.5%53.0%Muse Spark 1.2
CyberBench (Vals AI)70.3%69.5%Claude Sonnet 5
SciCode54.3%57.4%Muse Spark 1.2
FrontierCode42.7%Not measuredOnly Claude Sonnet 5 measured
FrontierSWENot measured12.0%Only Muse Spark 1.2 measured
GSO-Bench37.3%Not measuredOnly Claude Sonnet 5 measured
WeirdML68.8%60.3%Claude Sonnet 5
ALE-Bench1463.1Not measuredOnly Claude Sonnet 5 measured
LMArena Text: coding14831505Muse Spark 1.2
LMArena Text: software and IT14741505Muse Spark 1.2
LMArena WebDev: React15411526Claude Sonnet 5
LMArena WebDev: HTML15271543Muse Spark 1.2
LMArena WebDev: from an image1540Not measuredOnly Claude Sonnet 5 measured
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 index11
Intelligence benchmarks for Claude Sonnet 5 and Muse Spark 1.2
BenchmarkClaude Sonnet 5Muse Spark 1.2Leader
AA Intelligence Index38.239.6Muse Spark 1.2
Epoch Capabilities Index156.9155.1Claude Sonnet 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index143
Agentic work benchmarks for Claude Sonnet 5 and Muse Spark 1.2
BenchmarkClaude Sonnet 5Muse Spark 1.2Leader
AA Agentic Index43.643.2Claude Sonnet 5
Design Arena: agents building web apps12451221Claude Sonnet 5
Design Arena: agents building full-stack apps12491210Claude Sonnet 5
Design Arena: agents building mobile apps12151181Claude Sonnet 5
Design Arena: agents building Android apps12271222Claude Sonnet 5
Design Arena: agents building Godot games1225Not measuredOnly Claude Sonnet 5 measured
Design Arena: agents building games12271179Claude Sonnet 5
Design Arena: HTML slides11681085Claude Sonnet 5
Design Arena: PowerPoint slides11911172Claude Sonnet 5
Design Arena: spreadsheets1035Not measuredOnly Claude Sonnet 5 measured
LiveBench research82.8%67.7%Claude Sonnet 5
LiveBench browser72.0%36.0%Claude Sonnet 5
LiveBench long agentic39.0%21.3%Claude Sonnet 5
SREBench (Vals AI)0.4%0.0%Claude Sonnet 5
Finance Agent (Vals AI)53.9%60.6%Muse Spark 1.2
Tax Agent Bench (Vals AI)29.4%32.8%Muse Spark 1.2
Legal Research Bench (Vals AI)41.8%43.8%Muse Spark 1.2
Excel Modeling Benchmark (Vals AI)66.3%57.0%Claude Sonnet 5
BioMysteryBench (Vals AI)Not measured64.8%Only Muse Spark 1.2 measured
Terminal-Bench-Science (Vals AI)5.7%Not measuredOnly Claude Sonnet 5 measured
APEX-Agents54.5%45.4%Claude Sonnet 5
Vending-Bench 2$6,378Not measuredOnly Claude Sonnet 5 measured
Neither model has a result on the other 19 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index37
Reasoning benchmarks for Claude Sonnet 5 and Muse Spark 1.2
BenchmarkClaude Sonnet 5Muse Spark 1.2Leader
GPQA Diamond88.9%Not measuredOnly Claude Sonnet 5 measured
LiveBench reasoning88.7%90.0%Muse Spark 1.2
MMMU Pro (Vals AI)83.0%86.1%Muse Spark 1.2
GPQA Diamond (Artificial Analysis run)91.1%90.4%Claude Sonnet 5
Humanity's Last Exam (Artificial Analysis run)41.3%45.5%Muse Spark 1.2
GPQA Diamond (Epoch AI run)90.5%Not measuredOnly Claude Sonnet 5 measured
SimpleBench60.6%74.5%Muse Spark 1.2
Chess puzzles45.0%27.0%Claude Sonnet 5
Mystery game puzzles35.0%Not measuredOnly Claude Sonnet 5 measured
LMArena Text: hard prompts14611489Muse Spark 1.2
LMArena Text: expert14891475Claude Sonnet 5
LMArena Text: hard prompts in English14641487Muse Spark 1.2
LMArena Vision: diagrams12931317Muse Spark 1.2
LMArena Vision: homework1311Not measuredOnly Claude Sonnet 5 measured
Neither model has a result on the other 8 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index21
Math benchmarks for Claude Sonnet 5 and Muse Spark 1.2
BenchmarkClaude Sonnet 5Muse Spark 1.2Leader
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%43.0%Claude Sonnet 5
LMArena Text: math14671484Muse Spark 1.2
LMArena Text: mathematical work14811480Claude Sonnet 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for Claude Sonnet 5 and Muse Spark 1.2
BenchmarkClaude Sonnet 5Muse Spark 1.2Leader
MMLU Pro87.5%88.3%Muse Spark 1.2
LegalBench (Vals AI)83.9%85.3%Muse Spark 1.2
CorpFin (Vals AI)67.0%70.9%Muse Spark 1.2
TaxEval (Vals AI)75.6%80.4%Muse Spark 1.2
MortgageTax (Vals AI)70.0%65.4%Claude Sonnet 5
MedCode (Vals AI)47.5%49.4%Muse Spark 1.2
SimpleQA Verified33.7%60.3%Muse Spark 1.2
LMArena Text: science14601500Muse Spark 1.2
LMArena Text: medicine and healthcare14421496Muse Spark 1.2
LMArena Text: legal and government14541517Muse Spark 1.2
LMArena Text: business and finance14361484Muse Spark 1.2
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 1.2
BenchmarkClaude Sonnet 5Muse Spark 1.2Leader
Design Arena: websites12741312Muse Spark 1.2
Design Arena: UI components12771298Muse Spark 1.2
Design Arena: game dev12771301Muse Spark 1.2
Design Arena: data viz12511334Muse Spark 1.2
Design Arena: 3D12611301Muse Spark 1.2
Design Arena: all code categories12751312Muse Spark 1.2
Design Arena: SVG11921284Muse Spark 1.2
Design Arena: ASCII art12071284Muse Spark 1.2
LiveBench design82.0%67.1%Claude Sonnet 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index322
General benchmarks for Claude Sonnet 5 and Muse Spark 1.2
BenchmarkClaude Sonnet 5Muse Spark 1.2Leader
LiveBench data analysis71.7%76.5%Muse Spark 1.2
Public Benefits Bench (Vals AI)66.0%68.5%Muse Spark 1.2
SAGE (Vals AI)48.9%47.7%Claude Sonnet 5
MedScribe (Vals AI)76.0%90.1%Muse Spark 1.2
Vals Multimodal Index68.8%69.8%Muse Spark 1.2
Long context reasoning (AA-LCR)82.0%79.0%Claude Sonnet 5
DTBench92.5%94.7%Muse Spark 1.2
LMCA50.0%48.4%Claude Sonnet 5
Surface Evolver Bench60.0%Not measuredOnly Claude Sonnet 5 measured
LMArena Text14421482Muse Spark 1.2
LMArena Text: instruction following14521462Muse Spark 1.2
LMArena Text: creative writing14161436Muse Spark 1.2
LMArena Vision12731304Muse Spark 1.2
LMArena Text: English14501483Muse Spark 1.2
LMArena Text: non-English14311476Muse Spark 1.2
LMArena Text: Chinese14781509Muse Spark 1.2
LMArena Text: German1442Not measuredOnly Claude Sonnet 5 measured
LMArena Text: Japanese1422Not measuredOnly Claude Sonnet 5 measured
LMArena Text: Korean14121462Muse Spark 1.2
LMArena Text: French14631495Muse Spark 1.2
LMArena Text: Spanish14381484Muse Spark 1.2
LMArena Text: Russian14501483Muse Spark 1.2
LMArena Text: Polish1425Not measuredOnly Claude Sonnet 5 measured
LMArena Text: multi-turn14531502Muse Spark 1.2
LMArena Text: longer queries14621473Muse Spark 1.2
LMArena Text: writing and language14361453Muse Spark 1.2
LMArena Text: entertainment and media14111443Muse Spark 1.2
LMArena Vision: English12751291Muse Spark 1.2
LMArena Vision: Chinese1331Not measuredOnly Claude Sonnet 5 measured
LMArena Vision: reading text12881313Muse Spark 1.2
LMArena Vision: humor1261Not measuredOnly Claude Sonnet 5 measured
LMArena Vision: creative writing1246Not measuredOnly Claude Sonnet 5 measured
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 1.2
BenchmarkClaude Sonnet 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

Claude Sonnet 5$0.0070Fits in one request
Muse Spark 1.2$0.0034Fits in one request

Muse Spark 1.2 costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 5$0.130Fits in one request
Muse Spark 1.2$0.075Fits in one request

Muse Spark 1.2 costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 5$0.500Fits in one request
Muse Spark 1.2$0.292Fits in one request

Muse Spark 1.2 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 1.2
SpecificationAnthropic Claude Sonnet 5Meta Muse Spark 1.2
MakerAnthropicMeta
WeightsNo public weights listedNo public weights listed
ReleasedJune 30, 2026August 5, 2026
Context window1M1.05M
Input $/Mtok$2.00$1.25
Output $/Mtok$10.00$4.25
Coding index57.755.7
Independent measurements behind it65
Cost per solved task$1.87$0.64
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 5 better than Muse Spark 1.2 for coding?

Pick Claude Sonnet 5 for coding: it scores 57.7 on the Vibe Coding Index against 55.7 for Muse Spark 1.2. Pick Muse Spark 1.2 for output tokens 2.4x cheaper ($4.25 vs $10.00 per million) and a lower cost per solved task ($0.64 against $1.87).

Which is cheaper, Claude Sonnet 5 or Muse Spark 1.2?

Claude Sonnet 5 costs $2.00 per million input tokens and $10.00 per million output tokens; Muse Spark 1.2 costs $1.25 and $4.25. Per solved SWE-bench Verified task, Claude Sonnet 5 costs $1.87 and Muse Spark 1.2 $0.64.

Which has the bigger context window, Claude Sonnet 5 or Muse Spark 1.2?

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

How many benchmarks is the Claude Sonnet 5 vs Muse Spark 1.2 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 1.2's on 5. 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-1-2">LLMBenchmark.ai, Claude Sonnet 5 vs Muse Spark 1.2</a></p>