Enter opens the highlighted result. Esc closes.

Claude Opus 5.5 vs Muse Spark 1.3

Claude Opus 5.5 leads Muse Spark 1.3 on coding, 88.8 to 57.4 on the Vibe Coding Index, and Muse Spark 1.3 costs 4.7x less per output token ($4.25 vs $20.00 per million). Updated October 22, 2026; 80 benchmarks have a result for both.

Replace Claude Opus 5.5 Replace Muse Spark 1.3
Claude Opus 5.5Anthropic
Coding
88.8
Overall
87.1
Output $/M
$20.00
76
Muse Spark 1.3Meta
Coding
57.4
Overall
68.6
Output $/M
$4.25
3
vs boards won of 80 shared, 1 tied

Claude Opus 5.5 or Muse Spark 1.3: which to pick

Pick Claude Opus 5.5 for coding: it scores 88.8 on the Vibe Coding Index against 57.4 for Muse Spark 1.3.

Pick Muse Spark 1.3 for output tokens 4.7x cheaper ($4.25 vs $20.00 per million) and a larger context window (1.05M against 1M tokens).

Model AClaude Opus 5.5Anthropic88.8/1005 independent benchmarksNo cost per solved taskModel BMuse Spark 1.3Meta57.4/1004 independent benchmarksNo cost per solved task
Shared results
80
Claude Opus 5.5 only
29
Muse Spark 1.3 only
12
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 Opus 5.5 88.8 from 5 benchmarks, Muse Spark 1.3 57.4 from 4 benchmarks.
Widest category
Math, 19.3 points apart on average over 6 shared benchmarks.
Widest single gap
Terminal-Bench 4 (Vals AI): Claude Opus 5.5 65.2% against Muse Spark 1.3 10.6%, 72.7 points apart on a 0 to 100 scale.
Output price
Claude Opus 5.5 $20.00 against Muse Spark 1.3 $4.25 per million output tokens, 4.7x apart.
Context window
Claude Opus 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 Opus 5.5BarsMuse Spark 1.3Ties
Coding170
Intelligence20
Agentic work1011 tie
Reasoning90
Math60
Knowledge40
Web design71
General211
All shared boards7631 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index170
Coding benchmarks for Claude Opus 5.5 and Muse Spark 1.3
BenchmarkClaude Opus 5.5Muse Spark 1.3Leader
LiveBench coding96.3%90.2%Claude Opus 5.5
LMArena WebDev18071659Claude Opus 5.5
AA Coding IndexNot measured75.8Only Muse Spark 1.3 measured
Terminal-Bench 4 (Vals AI)65.2%10.6%Claude Opus 5.5
Vibe Code Bench (Vals AI)90.3%82.9%Claude Opus 5.5
Code migration (Vals AI)66.7%27.6%Claude Opus 5.5
ProgramBench (Vals AI)18.5%0.5%Claude Opus 5.5
IOI (Vals AI)95.1%43.9%Claude Opus 5.5
Terminal-Bench 2.1 (Vals AI)87.6%72.3%Claude Opus 5.5
SWE-bench Multimodal (Vals AI)70.2%Not measuredOnly Claude Opus 5.5 measured
Vibe Code Bench 1-100 (Vals AI)30.4%Not measuredOnly Claude Opus 5.5 measured
CyberBench (Vals AI)74.6%69.4%Claude Opus 5.5
SciCode66.9%59.7%Claude Opus 5.5
FrontierCode54.6%Not measuredOnly Claude Opus 5.5 measured
FrontierSWE62.3%25.8%Claude Opus 5.5
MirrorCode77.4%Not measuredOnly Claude Opus 5.5 measured
ALE-Bench2147.41688.3Claude Opus 5.5
LMArena Text: coding15451510Claude Opus 5.5
LMArena Text: software and IT15381511Claude Opus 5.5
LMArena WebDev: React18551672Claude Opus 5.5
LMArena WebDev: HTML17531653Claude Opus 5.5
LMArena WebDev: from an image17531640Claude Opus 5.5
SciCode18.5%Not measuredOnly Claude Opus 5.5 measured
Neither model has a result on the other 16 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 5.5 and Muse Spark 1.3
BenchmarkClaude Opus 5.5Muse Spark 1.3Leader
AA Intelligence Index57.648.1Claude Opus 5.5
Epoch Capabilities Index168.8157.2Claude Opus 5.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index101
Agentic work benchmarks for Claude Opus 5.5 and Muse Spark 1.3
BenchmarkClaude Opus 5.5Muse Spark 1.3Leader
AA Agentic IndexNot measured55.5Only Muse Spark 1.3 measured
Design Arena: agents building web apps13161297Claude Opus 5.5
Design Arena: agents building full-stack appsNot measured1295Only Muse Spark 1.3 measured
Design Arena: agents building mobile apps13081218Claude Opus 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: spreadsheets13681062Claude Opus 5.5
LiveBench research85.0%68.6%Claude Opus 5.5
LiveBench browser80.0%80.0%Tie
LiveBench long agentic85.0%40.4%Claude Opus 5.5
SREBench (Vals AI)33.6%Not measuredOnly Claude Opus 5.5 measured
Finance Agent (Vals AI)58.6%58.9%Muse Spark 1.3
Tax Agent Bench (Vals AI)45.6%36.0%Claude Opus 5.5
Legal Research Bench (Vals AI)50.5%40.9%Claude Opus 5.5
Harvey's Legal Agent Benchmark (Vals AI)9.2%Not measuredOnly Claude Opus 5.5 measured
Excel Modeling Benchmark (Vals AI)75.9%62.7%Claude Opus 5.5
BioMysteryBench (Vals AI)79.3%Not measuredOnly Claude Opus 5.5 measured
Terminal-Bench-Science (Vals AI)47.1%4.3%Claude Opus 5.5
Vals Science Index58.7%Not measuredOnly Claude Opus 5.5 measured
Time Horizon Index (Vals AI)91.3%Not measuredOnly Claude Opus 5.5 measured
CUA-bench (Vals AI)14.0%Not measuredOnly Claude Opus 5.5 measured
Robo-bench (Vals AI)14.6%Not measuredOnly Claude Opus 5.5 measured
APEX-Agents73.5%58.6%Claude Opus 5.5
Remote Labor Index21.3%Not measuredOnly Claude Opus 5.5 measured
SpireClimb3.3%Not measuredOnly Claude Opus 5.5 measured
Vending-Bench 2$9,235Not measuredOnly Claude Opus 5.5 measured
LMArena Search1213Not measuredOnly Claude Opus 5.5 measured
Neither model has a result on the other 14 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index90
Reasoning benchmarks for Claude Opus 5.5 and Muse Spark 1.3
BenchmarkClaude Opus 5.5Muse Spark 1.3Leader
LiveBench reasoning92.2%89.7%Claude Opus 5.5
MysteryMechanism (Vals AI)49.5%Not measuredOnly Claude Opus 5.5 measured
GPQA Diamond (Artificial Analysis run)Not measured94.1%Only Muse Spark 1.3 measured
Humanity's Last Exam (Artificial Analysis run)61.4%48.7%Claude Opus 5.5
GPQA Diamond (Epoch AI run)90.6%Not measuredOnly Claude Opus 5.5 measured
ARC-AGI98.5%Not measuredOnly Claude Opus 5.5 measured
ARC-AGI-293.3%Not measuredOnly Claude Opus 5.5 measured
Chess puzzles67.0%37.0%Claude Opus 5.5
Mystery game puzzles71.0%25.0%Claude Opus 5.5
EBR-bench71.4%Not measuredOnly Claude Opus 5.5 measured
LMArena Text: hard prompts15361503Claude Opus 5.5
LMArena Text: expert15491519Claude Opus 5.5
LMArena Text: hard prompts in English15351500Claude Opus 5.5
LMArena Vision: diagrams13451330Claude Opus 5.5
LMArena Vision: homework13621296Claude Opus 5.5
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Opus 5.5 and Muse Spark 1.3
BenchmarkClaude Opus 5.5Muse Spark 1.3Leader
OTIS Mock AIME100.0%99.2%Claude Opus 5.5
FrontierMath, tiers 1 to 391.2%74.4%Claude Opus 5.5
FrontierMath, tier 495.0%46.3%Claude Opus 5.5
ProofBench100.0%58.0%Claude Opus 5.5
LMArena Text: math15181497Claude Opus 5.5
LMArena Text: mathematical work15161491Claude Opus 5.5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for Claude Opus 5.5 and Muse Spark 1.3
BenchmarkClaude Opus 5.5Muse Spark 1.3Leader
MedCode (Vals AI)49.8%Not measuredOnly Claude Opus 5.5 measured
SimpleQA Verified72.2%Not measuredOnly Claude Opus 5.5 measured
LMArena Text: science15241507Claude Opus 5.5
LMArena Text: medicine and healthcare15091493Claude Opus 5.5
LMArena Text: legal and government15181499Claude Opus 5.5
LMArena Text: business and finance14941490Claude Opus 5.5
FACTS Benchmark Suite65.3%Not measuredOnly Claude Opus 5.5 measured
Neither model has a result on the other 11 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index71
Web design benchmarks for Claude Opus 5.5 and Muse Spark 1.3
BenchmarkClaude Opus 5.5Muse Spark 1.3Leader
Design Arena: websites13351356Muse Spark 1.3
Design Arena: UI components13851349Claude Opus 5.5
Design Arena: game dev14611328Claude Opus 5.5
Design Arena: data viz13971343Claude Opus 5.5
Design Arena: 3D14761358Claude Opus 5.5
Design Arena: all code categories13901352Claude Opus 5.5
Design Arena: SVG13291301Claude Opus 5.5
Design Arena: ASCII artNot measured1278Only Muse Spark 1.3 measured
LiveBench design86.9%74.8%Claude Opus 5.5
GeneralLike-for-likePublic boards, shown as published, kept out of the index211
General benchmarks for Claude Opus 5.5 and Muse Spark 1.3
BenchmarkClaude Opus 5.5Muse Spark 1.3Leader
Vals Index70.2%Not measuredOnly Claude Opus 5.5 measured
LiveBench data analysis80.3%79.6%Claude Opus 5.5
Public Benefits Bench (Vals AI)70.6%Not measuredOnly Claude Opus 5.5 measured
SAGE (Vals AI)45.8%Not measuredOnly Claude Opus 5.5 measured
MedScribe (Vals AI)91.4%Not measuredOnly Claude Opus 5.5 measured
Long context reasoning (AA-LCR)84.7%83.0%Claude Opus 5.5
DTBench98.9%96.5%Claude Opus 5.5
LMCA68.2%53.9%Claude Opus 5.5
Furniture assembly83.3%Not measuredOnly Claude Opus 5.5 measured
LMArena Text15161490Claude Opus 5.5
LMArena Text: instruction following15371479Claude Opus 5.5
LMArena Text: creative writing15351462Claude Opus 5.5
LMArena Vision13211308Claude Opus 5.5
LMArena Text: English15191495Claude Opus 5.5
LMArena Text: non-English15071481Claude Opus 5.5
LMArena Text: Chinese15821532Claude Opus 5.5
LMArena Text: GermanNot measured1513Only Muse Spark 1.3 measured
LMArena Text: Japanese15341470Claude Opus 5.5
LMArena Text: KoreanNot measured1490Only Muse Spark 1.3 measured
LMArena Text: French14931511Muse Spark 1.3
LMArena Text: Spanish15081496Claude Opus 5.5
LMArena Text: Russian15171491Claude Opus 5.5
LMArena Text: PolishNot measured1490Only Muse Spark 1.3 measured
LMArena Text: multi-turn15011487Claude Opus 5.5
LMArena Text: longer queries15321488Claude Opus 5.5
LMArena Text: writing and language15321470Claude Opus 5.5
LMArena Text: entertainment and media15151457Claude Opus 5.5
LMArena Vision: English13171298Claude Opus 5.5
LMArena Vision: ChineseNot measured1384Only Muse Spark 1.3 measured
LMArena Vision: reading text13261319Claude Opus 5.5
LMArena Vision: humorNot measured1293Only Muse Spark 1.3 measured
LMArena Vision: creative writing13201296Claude Opus 5.5
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 Opus 5.5 and Muse Spark 1.3
BenchmarkClaude Opus 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 Opus 5.5$0.014Fits 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 Opus 5.5$0.260Fits 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 Opus 5.5$1.00Fits 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 Opus 5.5 and Muse Spark 1.3
SpecificationAnthropic Claude Opus 5.5Meta Muse Spark 1.3
MakerAnthropicMeta
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 22, 2026September 2, 2026
Context window1M1.05M
Input $/Mtok$4.00$1.25
Output $/Mtok$20.00$4.25
Coding index88.857.4
Independent measurements behind it54
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

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

Pick Claude Opus 5.5 for coding: it scores 88.8 on the Vibe Coding Index against 57.4 for Muse Spark 1.3. Pick Muse Spark 1.3 for output tokens 4.7x cheaper ($4.25 vs $20.00 per million) and a larger context window (1.05M against 1M tokens).

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

Claude Opus 5.5 costs $4.00 per million input tokens and $20.00 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 Opus 5.5 or Muse Spark 1.3?

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

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

80 benchmarks have a result for both models as of October 22, 2026. Claude Opus 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.

Compare next

Embed this comparison on your site

Free under CC BY 4.0, while the source link stays visible. Preview the frame · Terms and other embeds

<iframe src="https://llmbenchmark.ai/embed/compare/claude-opus-5-5-vs-meta-muse-spark-1-3" title="Claude Opus 5.5 vs Muse Spark 1.3, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/claude-opus-5-5-vs-meta-muse-spark-1-3">LLMBenchmark.ai, Claude Opus 5.5 vs Muse Spark 1.3</a></p>