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Claude Sonnet 5.5 vs Muse Spark 1.3

Claude Sonnet 5.5 leads Muse Spark 1.3 on coding, 87.3 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; 78 benchmarks have a result for both.

Replace Claude Sonnet 5.5 Replace Muse Spark 1.3
Claude Sonnet 5.5Anthropic
Coding
87.3
Overall
82.8
Output $/M
$10.00
54
Muse Spark 1.3Meta
Coding
57.4
Overall
68.6
Output $/M
$4.25
24
vs boards won of 78 shared

Claude Sonnet 5.5 or Muse Spark 1.3: which to pick

Pick Claude Sonnet 5.5 for coding: it scores 87.3 on the Vibe Coding Index against 57.4 for Muse Spark 1.3.

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).

Model AClaude Sonnet 5.5Anthropic87.3/1005 independent benchmarksNo cost per solved taskModel BMuse Spark 1.3Meta57.4/1004 independent benchmarksNo cost per solved task
Shared results
78
Claude Sonnet 5.5 only
18
Muse Spark 1.3 only
14
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 5.5 87.3 from 5 benchmarks, Muse Spark 1.3 57.4 from 4 benchmarks.
Widest category
Math, 15.8 points apart on average over 6 shared benchmarks.
Widest single gap
Terminal-Bench 4 (Vals AI): Claude Sonnet 5.5 64.1% against Muse Spark 1.3 10.6%, 71.4 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 5.5 $10.00 against Muse Spark 1.3 $4.25 per million output tokens, 2.4x apart.
Context window
Claude Sonnet 5.5 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 5.5BarsMuse Spark 1.3Ties
Coding152
Intelligence20
Agentic work111
Reasoning72
Math51
Knowledge04
Web design61
General813
All shared boards5424
CodingLike-for-likeSix of these boards feed the Vibe Coding Index152
Coding benchmarks for Claude Sonnet 5.5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5.5Muse Spark 1.3Leader
LiveBench coding94.7%90.2%Claude Sonnet 5.5
LMArena WebDev17681659Claude Sonnet 5.5
AA Coding IndexNot measured75.8Only Muse Spark 1.3 measured
Terminal-Bench 4 (Vals AI)64.1%10.6%Claude Sonnet 5.5
Vibe Code Bench (Vals AI)92.4%82.9%Claude Sonnet 5.5
Code migration (Vals AI)69.8%27.6%Claude Sonnet 5.5
ProgramBench (Vals AI)6.5%0.5%Claude Sonnet 5.5
IOI (Vals AI)83.1%43.9%Claude Sonnet 5.5
Terminal-Bench 2.1 (Vals AI)83.2%72.3%Claude Sonnet 5.5
SWE-bench Multimodal (Vals AI)58.3%Not measuredOnly Claude Sonnet 5.5 measured
CyberBench (Vals AI)59.6%69.4%Muse Spark 1.3
SciCode61.0%59.7%Claude Sonnet 5.5
FrontierCode52.1%Not measuredOnly Claude Sonnet 5.5 measured
FrontierSWE61.9%25.8%Claude Sonnet 5.5
ALE-Bench1819.11688.3Claude Sonnet 5.5
LMArena Text: coding15131510Claude Sonnet 5.5
LMArena Text: software and IT15041511Muse Spark 1.3
LMArena WebDev: React18171672Claude Sonnet 5.5
LMArena WebDev: HTML17411653Claude Sonnet 5.5
LMArena WebDev: from an image17371640Claude Sonnet 5.5
SciCode13.8%Not measuredOnly Claude Sonnet 5.5 measured
Neither model has a result on the other 18 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Sonnet 5.5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5.5Muse Spark 1.3Leader
AA Intelligence Index56.048.1Claude Sonnet 5.5
Epoch Capabilities Index166.2157.2Claude Sonnet 5.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index111
Agentic work benchmarks for Claude Sonnet 5.5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5.5Muse Spark 1.3Leader
AA Agentic IndexNot measured55.5Only Muse Spark 1.3 measured
Design Arena: agents building web apps13051297Claude Sonnet 5.5
Design Arena: agents building full-stack appsNot measured1295Only Muse Spark 1.3 measured
Design Arena: agents building mobile apps12601218Claude Sonnet 5.5
Design Arena: agents building Godot gamesNot measured1241Only Muse Spark 1.3 measured
Design Arena: PowerPoint slidesNot measured1219Only Muse Spark 1.3 measured
Design Arena: spreadsheets12601062Claude Sonnet 5.5
LiveBench research83.6%68.6%Claude Sonnet 5.5
LiveBench browser84.0%80.0%Claude Sonnet 5.5
LiveBench long agentic78.8%40.4%Claude Sonnet 5.5
SREBench (Vals AI)30.1%Not measuredOnly Claude Sonnet 5.5 measured
Finance Agent (Vals AI)58.1%58.9%Muse Spark 1.3
Tax Agent Bench (Vals AI)42.0%36.0%Claude Sonnet 5.5
Legal Research Bench (Vals AI)48.1%40.9%Claude Sonnet 5.5
Harvey's Legal Agent Benchmark (Vals AI)10.4%Not measuredOnly Claude Sonnet 5.5 measured
Excel Modeling Benchmark (Vals AI)75.7%62.7%Claude Sonnet 5.5
BioMysteryBench (Vals AI)81.1%Not measuredOnly Claude Sonnet 5.5 measured
Terminal-Bench-Science (Vals AI)47.1%4.3%Claude Sonnet 5.5
Vals Science Index59.1%Not measuredOnly Claude Sonnet 5.5 measured
APEX-Agents75.5%58.6%Claude Sonnet 5.5
SpireClimb1.3%Not measuredOnly Claude Sonnet 5.5 measured
Vending-Bench 2$11,165Not measuredOnly Claude Sonnet 5.5 measured
Neither model has a result on the other 19 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index72
Reasoning benchmarks for Claude Sonnet 5.5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5.5Muse Spark 1.3Leader
LiveBench reasoning91.6%89.7%Claude Sonnet 5.5
MysteryMechanism (Vals AI)49.1%Not measuredOnly Claude Sonnet 5.5 measured
GPQA Diamond (Artificial Analysis run)Not measured94.1%Only Muse Spark 1.3 measured
Humanity's Last Exam (Artificial Analysis run)55.0%48.7%Claude Sonnet 5.5
GPQA Diamond (Epoch AI run)95.6%Not measuredOnly Claude Sonnet 5.5 measured
Chess puzzles59.0%37.0%Claude Sonnet 5.5
Mystery game puzzles65.0%25.0%Claude Sonnet 5.5
LMArena Text: hard prompts14941503Muse Spark 1.3
LMArena Text: expert15311519Claude Sonnet 5.5
LMArena Text: hard prompts in English15021500Claude Sonnet 5.5
LMArena Vision: diagrams13291330Muse Spark 1.3
LMArena Vision: homework13311296Claude Sonnet 5.5
Neither model has a result on the other 10 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index51
Math benchmarks for Claude Sonnet 5.5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5.5Muse Spark 1.3Leader
OTIS Mock AIME100.0%99.2%Claude Sonnet 5.5
FrontierMath, tiers 1 to 388.8%74.4%Claude Sonnet 5.5
FrontierMath, tier 480.5%46.3%Claude Sonnet 5.5
ProofBench100.0%58.0%Claude Sonnet 5.5
LMArena Text: math14971497Muse Spark 1.3
LMArena Text: mathematical work15101491Claude Sonnet 5.5
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 5.5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5.5Muse Spark 1.3Leader
MedCode (Vals AI)52.9%Not measuredOnly Claude Sonnet 5.5 measured
SimpleQA Verified46.5%Not measuredOnly Claude Sonnet 5.5 measured
LMArena Text: science14831507Muse Spark 1.3
LMArena Text: medicine and healthcare14641493Muse Spark 1.3
LMArena Text: legal and government14831499Muse Spark 1.3
LMArena Text: business and finance14681490Muse Spark 1.3
Neither model has a result on the other 12 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index61
Web design benchmarks for Claude Sonnet 5.5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5.5Muse Spark 1.3Leader
Design Arena: websites13261356Muse Spark 1.3
Design Arena: UI components13681349Claude Sonnet 5.5
Design Arena: game dev14711328Claude Sonnet 5.5
Design Arena: data viz13921343Claude Sonnet 5.5
Design Arena: 3D14451358Claude Sonnet 5.5
Design Arena: all code categories13641352Claude Sonnet 5.5
Design Arena: SVGNot measured1301Only Muse Spark 1.3 measured
Design Arena: ASCII artNot measured1278Only Muse Spark 1.3 measured
LiveBench design85.0%74.8%Claude Sonnet 5.5
GeneralLike-for-likePublic boards, shown as published, kept out of the index813
General benchmarks for Claude Sonnet 5.5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5.5Muse Spark 1.3Leader
Vals Index70.8%Not measuredOnly Claude Sonnet 5.5 measured
LiveBench data analysis59.5%79.6%Muse Spark 1.3
Public Benefits Bench (Vals AI)67.2%Not measuredOnly Claude Sonnet 5.5 measured
SAGE (Vals AI)51.8%Not measuredOnly Claude Sonnet 5.5 measured
MedScribe (Vals AI)91.1%Not measuredOnly Claude Sonnet 5.5 measured
Long context reasoning (AA-LCR)82.7%83.0%Muse Spark 1.3
DTBench97.3%96.5%Claude Sonnet 5.5
LMCA68.3%53.9%Claude Sonnet 5.5
Furniture assembly75.0%Not measuredOnly Claude Sonnet 5.5 measured
LMArena Text14731490Muse Spark 1.3
LMArena Text: instruction following14921479Claude Sonnet 5.5
LMArena Text: creative writing14671462Claude Sonnet 5.5
LMArena Vision12871308Muse Spark 1.3
LMArena Text: English14841495Muse Spark 1.3
LMArena Text: non-English14561481Muse Spark 1.3
LMArena Text: Chinese15351532Claude Sonnet 5.5
LMArena Text: GermanNot measured1513Only Muse Spark 1.3 measured
LMArena Text: JapaneseNot measured1470Only Muse Spark 1.3 measured
LMArena Text: KoreanNot measured1490Only Muse Spark 1.3 measured
LMArena Text: French14991511Muse Spark 1.3
LMArena Text: Spanish14511496Muse Spark 1.3
LMArena Text: Russian14541491Muse Spark 1.3
LMArena Text: PolishNot measured1490Only Muse Spark 1.3 measured
LMArena Text: multi-turn14651487Muse Spark 1.3
LMArena Text: longer queries14951488Claude Sonnet 5.5
LMArena Text: writing and language14741470Claude Sonnet 5.5
LMArena Text: entertainment and media14611457Claude Sonnet 5.5
LMArena Vision: English12891298Muse Spark 1.3
LMArena Vision: ChineseNot measured1384Only Muse Spark 1.3 measured
LMArena Vision: reading text12971319Muse Spark 1.3
LMArena Vision: humorNot measured1293Only Muse Spark 1.3 measured
LMArena Vision: creative writing12421296Muse Spark 1.3
Neither model has a result on the other 14 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Sonnet 5.5 and Muse Spark 1.3
BenchmarkClaude Sonnet 5.5Muse 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 5.5$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 5.5$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 5.5$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 5.5 and Muse Spark 1.3
SpecificationAnthropic Claude Sonnet 5.5Meta Muse Spark 1.3
MakerAnthropicMeta
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 28, 2026September 2, 2026
Context window1M1.05M
Input $/Mtok$2.00$1.25
Output $/Mtok$10.00$4.25
Coding index87.357.4
Independent measurements behind it54
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 5.5 better than Muse Spark 1.3 for coding?

Pick Claude Sonnet 5.5 for coding: it scores 87.3 on the Vibe Coding Index against 57.4 for Muse Spark 1.3. 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).

Which is cheaper, Claude Sonnet 5.5 or Muse Spark 1.3?

Claude Sonnet 5.5 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 neither of them.

Which has the bigger context window, Claude Sonnet 5.5 or Muse Spark 1.3?

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

How many benchmarks is the Claude Sonnet 5.5 vs Muse Spark 1.3 comparison based on?

78 benchmarks have a result for both models as of October 22, 2026. Claude Sonnet 5.5's coding index rests on 5 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-5-5-vs-meta-muse-spark-1-3">LLMBenchmark.ai, Claude Sonnet 5.5 vs Muse Spark 1.3</a></p>