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Claude Opus 5 vs Muse Spark 1.3

Claude Opus 5 leads Muse Spark 1.3 on coding, 83.0 to 57.4 on the Vibe Coding Index, and Muse Spark 1.3 costs 5.9x less per output token ($4.25 vs $25.00 per million). Updated October 22, 2026; 91 benchmarks have a result for both.

Replace Claude Opus 5 Replace Muse Spark 1.3
Claude Opus 5Anthropic
Coding
83.0
Overall
81.6
Output $/M
$25.00
78
Muse Spark 1.3Meta
Coding
57.4
Overall
68.6
Output $/M
$4.25
13
vs boards won of 91 shared

Claude Opus 5 or Muse Spark 1.3: which to pick

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 57.4 for Muse Spark 1.3.

Pick Muse Spark 1.3 for output tokens 5.9x cheaper ($4.25 vs $25.00 per million) and a larger context window (1.05M against 1M tokens).

Model AClaude Opus 5Anthropic83.0/1006 independent benchmarks$1.33 per solved taskModel BMuse Spark 1.3Meta57.4/1004 independent benchmarksNo cost per solved task
Shared results
91
Claude Opus 5 only
40
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 Opus 5 83.0 from 6 benchmarks, Muse Spark 1.3 57.4 from 4 benchmarks.
Widest category
Math, 15.7 points apart on average over 6 shared benchmarks.
Widest single gap
Terminal-Bench 4 (Vals AI): Claude Opus 5 53.5% against Muse Spark 1.3 10.6%, 57.2 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against Muse Spark 1.3 $4.25 per million output tokens, 5.9x apart.
Context window
Claude Opus 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 5BarsMuse Spark 1.3Ties
Coding162
Intelligence20
Agentic work132
Reasoning91
Math51
Knowledge40
Web design45
General252
All shared boards7813
CodingLike-for-likeSix of these boards feed the Vibe Coding Index162
Coding benchmarks for Claude Opus 5 and Muse Spark 1.3
BenchmarkClaude Opus 5Muse Spark 1.3Leader
LiveBench coding90.8%90.2%Claude Opus 5
LMArena WebDev16891659Claude Opus 5
AA Coding Index78.075.8Claude Opus 5
LiveCodeBench (Vals AI)89.0%Not measuredOnly Claude Opus 5 measured
SWE-bench Verified (Vals AI)97.0%Not measuredOnly Claude Opus 5 measured
Terminal-Bench 4 (Vals AI)53.5%10.6%Claude Opus 5
Vibe Code Bench (Vals AI)88.4%82.9%Claude Opus 5
Code migration (Vals AI)57.5%27.6%Claude Opus 5
ProgramBench (Vals AI)3.0%0.5%Claude Opus 5
IOI (Vals AI)84.3%43.9%Claude Opus 5
Terminal-Bench 2.1 (Vals AI)84.6%72.3%Claude Opus 5
Vibe Code Bench 1-100 (Vals AI)28.5%Not measuredOnly Claude Opus 5 measured
SkillsBench (Vals AI)60.4%Not measuredOnly Claude Opus 5 measured
CyberBench (Vals AI)65.4%69.4%Muse Spark 1.3
SciCode56.4%59.7%Muse Spark 1.3
FrontierCode53.4%Not measuredOnly Claude Opus 5 measured
FrontierSWE52.0%25.8%Claude Opus 5
WeirdML91.8%Not measuredOnly Claude Opus 5 measured
ALE-Bench2164.61688.3Claude Opus 5
LMArena Text: coding15331510Claude Opus 5
LMArena Text: software and IT15271511Claude Opus 5
LMArena WebDev: React17111672Claude Opus 5
LMArena WebDev: HTML16801653Claude Opus 5
LMArena WebDev: from an image16621640Claude Opus 5
SciCode13.8%Not measuredOnly Claude Opus 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 Opus 5 and Muse Spark 1.3
BenchmarkClaude Opus 5Muse Spark 1.3Leader
AA Intelligence Index50.848.1Claude Opus 5
Epoch Capabilities Index163.9157.2Claude Opus 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index132
Agentic work benchmarks for Claude Opus 5 and Muse Spark 1.3
BenchmarkClaude Opus 5Muse Spark 1.3Leader
AA Agentic Index56.555.5Claude Opus 5
Design Arena: agents building web apps12661297Muse Spark 1.3
Design Arena: agents building full-stack apps13061295Claude Opus 5
Design Arena: agents building mobile apps13481218Claude Opus 5
Design Arena: agents building Android apps1257Not measuredOnly Claude Opus 5 measured
Design Arena: agents building Godot games12791241Claude Opus 5
Design Arena: agents building games1261Not measuredOnly Claude Opus 5 measured
Design Arena: PowerPoint slides12401219Claude Opus 5
Design Arena: spreadsheetsNot measured1062Only Muse Spark 1.3 measured
LiveBench research88.9%68.6%Claude Opus 5
LiveBench browser84.0%80.0%Claude Opus 5
LiveBench long agentic62.1%40.4%Claude Opus 5
SREBench (Vals AI)12.2%Not measuredOnly Claude Opus 5 measured
Finance Agent (Vals AI)58.6%58.9%Muse Spark 1.3
Tax Agent Bench (Vals AI)45.5%36.0%Claude Opus 5
Legal Research Bench (Vals AI)55.3%40.9%Claude Opus 5
Excel Modeling Benchmark (Vals AI)73.6%62.7%Claude Opus 5
BioMysteryBench (Vals AI)79.3%Not measuredOnly Claude Opus 5 measured
Terminal-Bench-Science (Vals AI)27.1%4.3%Claude Opus 5
Vals Science Index47.9%Not measuredOnly Claude Opus 5 measured
Time Horizon Index (Vals AI)18.8%Not measuredOnly Claude Opus 5 measured
CUA-bench (Vals AI)9.0%Not measuredOnly Claude Opus 5 measured
APEX-Agents65.8%58.6%Claude Opus 5
OSWorld 2.031.4%Not measuredOnly Claude Opus 5 measured
BALROG63.4%Not measuredOnly Claude Opus 5 measured
PostTrainBench35.0%Not measuredOnly Claude Opus 5 measured
Vending-Bench 2$11,182Not measuredOnly Claude Opus 5 measured
LMArena Search1242Not measuredOnly Claude Opus 5 measured
Neither model has a result on the other 13 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index91
Reasoning benchmarks for Claude Opus 5 and Muse Spark 1.3
BenchmarkClaude Opus 5Muse Spark 1.3Leader
GPQA Diamond93.4%Not measuredOnly Claude Opus 5 measured
LiveBench reasoning91.2%89.7%Claude Opus 5
MysteryMechanism (Vals AI)37.4%Not measuredOnly Claude Opus 5 measured
MMMU Pro (Vals AI)89.9%Not measuredOnly Claude Opus 5 measured
GPQA Diamond (Artificial Analysis run)93.7%94.1%Muse Spark 1.3
Humanity's Last Exam (Artificial Analysis run)54.9%48.7%Claude Opus 5
GPQA Diamond (Epoch AI run)93.9%Not measuredOnly Claude Opus 5 measured
ARC-AGI97.5%Not measuredOnly Claude Opus 5 measured
ARC-AGI-290.4%Not measuredOnly Claude Opus 5 measured
SimpleBench80.6%Not measuredOnly Claude Opus 5 measured
Chess puzzles43.0%37.0%Claude Opus 5
Mystery game puzzles59.0%25.0%Claude Opus 5
EBR-bench45.7%Not measuredOnly Claude Opus 5 measured
LMArena Text: hard prompts15271503Claude Opus 5
LMArena Text: expert15541519Claude Opus 5
LMArena Text: hard prompts in English15231500Claude Opus 5
LMArena Vision: diagrams13481330Claude Opus 5
LMArena Vision: homework13381296Claude Opus 5
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index51
Math benchmarks for Claude Opus 5 and Muse Spark 1.3
BenchmarkClaude Opus 5Muse Spark 1.3Leader
OTIS Mock AIME98.9%99.2%Muse Spark 1.3
FrontierMath, tiers 1 to 385.6%74.4%Claude Opus 5
FrontierMath, tier 473.2%46.3%Claude Opus 5
ProofBench99.0%58.0%Claude Opus 5
LMArena Text: math15331497Claude Opus 5
LMArena Text: mathematical work15441491Claude Opus 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 and Muse Spark 1.3
BenchmarkClaude Opus 5Muse Spark 1.3Leader
MMLU Pro91.6%Not measuredOnly Claude Opus 5 measured
LegalBench (Vals AI)87.0%Not measuredOnly Claude Opus 5 measured
CorpFin (Vals AI)73.2%Not measuredOnly Claude Opus 5 measured
TaxEval (Vals AI)75.1%Not measuredOnly Claude Opus 5 measured
MortgageTax (Vals AI)72.1%Not measuredOnly Claude Opus 5 measured
MedCode (Vals AI)63.6%Not measuredOnly Claude Opus 5 measured
SimpleQA Verified59.9%Not measuredOnly Claude Opus 5 measured
LMArena Text: science15311507Claude Opus 5
LMArena Text: medicine and healthcare15251493Claude Opus 5
LMArena Text: legal and government15301499Claude Opus 5
LMArena Text: business and finance15011490Claude Opus 5
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index45
Web design benchmarks for Claude Opus 5 and Muse Spark 1.3
BenchmarkClaude Opus 5Muse Spark 1.3Leader
Design Arena: websites13091356Muse Spark 1.3
Design Arena: UI components13461349Muse Spark 1.3
Design Arena: game dev13371328Claude Opus 5
Design Arena: data viz13291343Muse Spark 1.3
Design Arena: 3D13341358Muse Spark 1.3
Design Arena: all code categories13231352Muse Spark 1.3
Design Arena: SVG13111301Claude Opus 5
Design Arena: ASCII art13521278Claude Opus 5
LiveBench design83.0%74.8%Claude Opus 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index252
General benchmarks for Claude Opus 5 and Muse Spark 1.3
BenchmarkClaude Opus 5Muse Spark 1.3Leader
LiveBench data analysis74.6%79.6%Muse Spark 1.3
Public Benefits Bench (Vals AI)76.9%Not measuredOnly Claude Opus 5 measured
SAGE (Vals AI)49.4%Not measuredOnly Claude Opus 5 measured
MedScribe (Vals AI)91.0%Not measuredOnly Claude Opus 5 measured
Vals Multimodal Index73.9%Not measuredOnly Claude Opus 5 measured
Long context reasoning (AA-LCR)82.0%83.0%Muse Spark 1.3
DTBench97.9%96.5%Claude Opus 5
LMCA64.5%53.9%Claude Opus 5
Furniture assembly60.8%Not measuredOnly Claude Opus 5 measured
LMArena Text15091490Claude Opus 5
LMArena Text: instruction following15181479Claude Opus 5
LMArena Text: creative writing14931462Claude Opus 5
LMArena Vision13201308Claude Opus 5
LMArena Text: English15081495Claude Opus 5
LMArena Text: non-English15021481Claude Opus 5
LMArena Text: Chinese15731532Claude Opus 5
LMArena Text: German15271513Claude Opus 5
LMArena Text: Japanese15201470Claude Opus 5
LMArena Text: Korean15171490Claude Opus 5
LMArena Text: French15191511Claude Opus 5
LMArena Text: Spanish15231496Claude Opus 5
LMArena Text: Russian15071491Claude Opus 5
LMArena Text: Polish15221490Claude Opus 5
LMArena Text: multi-turn15001487Claude Opus 5
LMArena Text: longer queries15171488Claude Opus 5
LMArena Text: writing and language14991470Claude Opus 5
LMArena Text: entertainment and media14811457Claude Opus 5
LMArena Vision: English13151298Claude Opus 5
LMArena Vision: Chinese14001384Claude Opus 5
LMArena Vision: reading text13291319Claude Opus 5
LMArena Vision: humor12931293Claude Opus 5
LMArena Vision: creative writing13131296Claude Opus 5
LMArena Document1516Not measuredOnly Claude Opus 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 Opus 5 and Muse Spark 1.3
BenchmarkClaude Opus 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$0.018Fits 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$0.325Fits 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$1.25Fits 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 and Muse Spark 1.3
SpecificationAnthropic Claude Opus 5Meta Muse Spark 1.3
MakerAnthropicMeta
WeightsNo public weights listedNo public weights listed
ReleasedJuly 24, 2026September 2, 2026
Context window1M1.05M
Input $/Mtok$5.00$1.25
Output $/Mtok$25.00$4.25
Coding index83.057.4
Independent measurements behind it64
Cost per solved task$1.33Not computable
SourceOpenRouter listingOpenRouter listing

Questions

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

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 57.4 for Muse Spark 1.3. Pick Muse Spark 1.3 for output tokens 5.9x cheaper ($4.25 vs $25.00 per million) and a larger context window (1.05M against 1M tokens).

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

Claude Opus 5 costs $5.00 per million input tokens and $25.00 per million output tokens; Muse Spark 1.3 costs $1.25 and $4.25. Cost per solved task is known for Claude Opus 5 only.

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

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

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

91 benchmarks have a result for both models as of October 22, 2026. Claude Opus 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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<iframe src="https://llmbenchmark.ai/embed/compare/claude-opus-5-vs-meta-muse-spark-1-3" title="Claude Opus 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-vs-meta-muse-spark-1-3">LLMBenchmark.ai, Claude Opus 5 vs Muse Spark 1.3</a></p>