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Claude Opus 4.6 vs Muse Spark 1.3

Updated October 21, 2026. 66 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 4.6 Replace Muse Spark 1.3
Claude Opus 4.6Anthropic
Coding
66.9
Overall
31.9
Output $/M
$25.00
34
Muse Spark 1.3Meta
Coding
79.7
Overall
48.1
Output $/M
$4.25
31
vs boards won of 66 shared, 1 tied

Decision reading

Pick Muse Spark 1.3 for coding: it scores 79.7 on the Vibe Coding Index against 66.9 for Claude Opus 4.6.

Pick Claude Opus 4.6 when what matters is LMArena Text: coding or LMArena Text: software and IT, where it leads.

Model AClaude Opus 4.6Anthropic66.9/1002 independent benchmarks$1.56 per solved taskModel BMuse Spark 1.3Meta79.7/1002 independent benchmarksNo cost per solved task
Shared results
66
Claude Opus 4.6 only
42
Muse Spark 1.3 only
26
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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 4.6 66.9 from 2 benchmarks, Muse Spark 1.3 79.7 from 2 benchmarks.
Widest category
Coding, 10.7 points apart on average over 7 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Claude Opus 4.6 57.6% against Muse Spark 1.3 82.9%, 25.3 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.6 $25.00 against Muse Spark 1.3 $4.25 per million output tokens, 5.9x apart.
Context window
Claude Opus 4.6 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 4.6BarsMuse Spark 1.3Ties
Coding25
Intelligence02
Agentic work04
Reasoning531 tie
Math24
Knowledge40
Web design08
General215
All shared boards34311 tie
CodingLike-for-likeFour of these boards feed the Vibe Coding Index25
Coding benchmarks for Claude Opus 4.6 and Muse Spark 1.3
BenchmarkClaude Opus 4.6Muse Spark 1.3Leader
SWE-bench Verified75.6%Not measuredOnly Claude Opus 4.6 measured
SWE-bench Multilingual72.0%Not measuredOnly Claude Opus 4.6 measured
LiveBench codingNot measured90.2%Only Muse Spark 1.3 measured
LMArena WebDev15471659Muse Spark 1.3
AA Coding IndexNot measured75.8Only Muse Spark 1.3 measured
LiveCodeBench (Vals AI)84.7%Not measuredOnly Claude Opus 4.6 measured
SWE-bench Verified (Vals AI)78.2%Not measuredOnly Claude Opus 4.6 measured
Terminal-Bench 4 (Vals AI)Not measured10.6%Only Muse Spark 1.3 measured
Vibe Code Bench (Vals AI)57.6%82.9%Muse Spark 1.3
Code migration (Vals AI)Not measured27.6%Only Muse Spark 1.3 measured
ProgramBench (Vals AI)Not measured0.5%Only Muse Spark 1.3 measured
IOI (Vals AI)Not measured43.9%Only Muse Spark 1.3 measured
Terminal-Bench 2.1 (Vals AI)Not measured72.3%Only Muse Spark 1.3 measured
CyberBench (Vals AI)Not measured69.4%Only Muse Spark 1.3 measured
SciCodeNot measured59.7%Only Muse Spark 1.3 measured
Terminal-Bench Hard (Artificial Analysis run)48.5%Not measuredOnly Claude Opus 4.6 measured
Terminal-Bench79.8%Not measuredOnly Claude Opus 4.6 measured
FrontierCode26.6%Not measuredOnly Claude Opus 4.6 measured
FrontierSWENot measured25.8%Only Muse Spark 1.3 measured
GSO-Bench41.2%Not measuredOnly Claude Opus 4.6 measured
WeirdML78.0%Not measuredOnly Claude Opus 4.6 measured
Cybench93.0%Not measuredOnly Claude Opus 4.6 measured
ALE-BenchNot measured1688.3Only Muse Spark 1.3 measured
LMArena Text: coding15341510Claude Opus 4.6
LMArena Text: software and IT15271511Claude Opus 4.6
LMArena WebDev: React15391672Muse Spark 1.3
LMArena WebDev: HTML15591653Muse Spark 1.3
LMArena WebDev: from an image15431640Muse Spark 1.3
Neither model has a result on the other 10 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Opus 4.6 and Muse Spark 1.3
BenchmarkClaude Opus 4.6Muse Spark 1.3Leader
AA Intelligence Index31.948.1Muse Spark 1.3
Epoch Capabilities Index155.7157.2Muse Spark 1.3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index04
Agentic work benchmarks for Claude Opus 4.6 and Muse Spark 1.3
BenchmarkClaude Opus 4.6Muse Spark 1.3Leader
AA Agentic IndexNot measured55.5Only Muse Spark 1.3 measured
Design Arena: agents building web apps12061297Muse Spark 1.3
Design Arena: agents building full-stack apps12201295Muse Spark 1.3
Design Arena: agents building mobile apps12071217Muse Spark 1.3
Design Arena: agents building Android apps1204Not measuredOnly Claude Opus 4.6 measured
Design Arena: agents building Godot gamesNot measured1241Only Muse Spark 1.3 measured
Design Arena: agents building games1214Not measuredOnly Claude Opus 4.6 measured
Design Arena: PowerPoint slidesNot measured1244Only Muse Spark 1.3 measured
Design Arena: spreadsheetsNot measured1048Only Muse Spark 1.3 measured
LiveBench researchNot measured68.6%Only Muse Spark 1.3 measured
LiveBench browserNot measured80.0%Only Muse Spark 1.3 measured
LiveBench long agenticNot measured40.4%Only Muse Spark 1.3 measured
Finance Agent (Vals AI)Not measured58.9%Only Muse Spark 1.3 measured
Tax Agent Bench (Vals AI)Not measured36.0%Only Muse Spark 1.3 measured
Legal Research Bench (Vals AI)Not measured40.9%Only Muse Spark 1.3 measured
Excel Modeling Benchmark (Vals AI)Not measured62.7%Only Muse Spark 1.3 measured
Terminal-Bench-Science (Vals AI)Not measured4.3%Only Muse Spark 1.3 measured
τ²-Bench Telecom92.1%Not measuredOnly Claude Opus 4.6 measured
APEX-Agents46.3%58.6%Muse Spark 1.3
METR time horizons78.9%Not measuredOnly Claude Opus 4.6 measured
Remote Labor Index4.2%Not measuredOnly Claude Opus 4.6 measured
DeepResearch Bench55.3%Not measuredOnly Claude Opus 4.6 measured
Vending-Bench 2$8,018Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index53
Reasoning benchmarks for Claude Opus 4.6 and Muse Spark 1.3
BenchmarkClaude Opus 4.6Muse Spark 1.3Leader
GPQA Diamond89.7%Not measuredOnly Claude Opus 4.6 measured
LiveBench reasoningNot measured89.7%Only Muse Spark 1.3 measured
MMMU Pro (Vals AI)83.9%Not measuredOnly Claude Opus 4.6 measured
GPQA Diamond (Artificial Analysis run)89.6%94.1%Muse Spark 1.3
Humanity's Last Exam (Artificial Analysis run)39.9%48.7%Muse Spark 1.3
GPQA Diamond (Epoch AI run)90.5%Not measuredOnly Claude Opus 4.6 measured
ARC-AGI94.0%Not measuredOnly Claude Opus 4.6 measured
ARC-AGI-269.2%Not measuredOnly Claude Opus 4.6 measured
SimpleBench67.6%Not measuredOnly Claude Opus 4.6 measured
Chess puzzles21.0%37.0%Muse Spark 1.3
Mystery game puzzles25.0%25.0%Tie
EBR-bench12.7%Not measuredOnly Claude Opus 4.6 measured
LMArena Text: hard prompts15251503Claude Opus 4.6
LMArena Text: expert15441519Claude Opus 4.6
LMArena Text: hard prompts in English15301500Claude Opus 4.6
LMArena Vision: diagrams13401330Claude Opus 4.6
LMArena Vision: homework13371296Claude Opus 4.6
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index24
Math benchmarks for Claude Opus 4.6 and Muse Spark 1.3
BenchmarkClaude Opus 4.6Muse Spark 1.3Leader
AIME95.6%Not measuredOnly Claude Opus 4.6 measured
OTIS Mock AIME94.4%99.2%Muse Spark 1.3
FrontierMath, tiers 1 to 366.0%74.4%Muse Spark 1.3
FrontierMath, tier 426.8%46.3%Muse Spark 1.3
ProofBench50.0%58.0%Muse Spark 1.3
LMArena Text: math15181497Claude Opus 4.6
LMArena Text: mathematical work15251491Claude Opus 4.6
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index40
Knowledge benchmarks for Claude Opus 4.6 and Muse Spark 1.3
BenchmarkClaude Opus 4.6Muse Spark 1.3Leader
MMLU Pro89.1%Not measuredOnly Claude Opus 4.6 measured
LegalBench (Vals AI)85.3%Not measuredOnly Claude Opus 4.6 measured
CaseLaw (Vals AI)62.1%Not measuredOnly Claude Opus 4.6 measured
CorpFin (Vals AI)67.0%Not measuredOnly Claude Opus 4.6 measured
TaxEval (Vals AI)76.0%Not measuredOnly Claude Opus 4.6 measured
MortgageTax (Vals AI)68.5%Not measuredOnly Claude Opus 4.6 measured
MedQA (Vals AI)95.4%Not measuredOnly Claude Opus 4.6 measured
MedCode (Vals AI)49.1%Not measuredOnly Claude Opus 4.6 measured
SimpleQA Verified47.0%Not measuredOnly Claude Opus 4.6 measured
LMArena Text: science15191507Claude Opus 4.6
LMArena Text: medicine and healthcare15041493Claude Opus 4.6
LMArena Text: legal and government15121499Claude Opus 4.6
LMArena Text: business and finance14971490Claude Opus 4.6
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for Claude Opus 4.6 and Muse Spark 1.3
BenchmarkClaude Opus 4.6Muse Spark 1.3Leader
Design Arena: websites12911356Muse Spark 1.3
Design Arena: UI components12841352Muse Spark 1.3
Design Arena: game dev12781329Muse Spark 1.3
Design Arena: data viz12791343Muse Spark 1.3
Design Arena: 3D12741359Muse Spark 1.3
Design Arena: all code categories12891353Muse Spark 1.3
Design Arena: SVG12271300Muse Spark 1.3
Design Arena: ASCII art12541280Muse Spark 1.3
LiveBench designNot measured74.8%Only Muse Spark 1.3 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index215
General benchmarks for Claude Opus 4.6 and Muse Spark 1.3
BenchmarkClaude Opus 4.6Muse Spark 1.3Leader
LiveBench data analysisNot measured79.6%Only Muse Spark 1.3 measured
SAGE (Vals AI)51.6%Not measuredOnly Claude Opus 4.6 measured
MedScribe (Vals AI)86.7%Not measuredOnly Claude Opus 4.6 measured
IFBench53.1%Not measuredOnly Claude Opus 4.6 measured
Long context reasoning (AA-LCR)78.0%83.0%Muse Spark 1.3
DTBench91.2%96.5%Muse Spark 1.3
LMCA55.8%53.9%Claude Opus 4.6
CL-bench20.7%Not measuredOnly Claude Opus 4.6 measured
Furniture assembly28.3%Not measuredOnly Claude Opus 4.6 measured
CL-bench Life17.0%Not measuredOnly Claude Opus 4.6 measured
LMArena Text15011490Claude Opus 4.6
LMArena Text: instruction following15211479Claude Opus 4.6
LMArena Text: creative writing15051462Claude Opus 4.6
LMArena Vision13161308Claude Opus 4.6
LMArena Text: English15111495Claude Opus 4.6
LMArena Text: non-English14881481Claude Opus 4.6
LMArena Text: Chinese15511532Claude Opus 4.6
LMArena Text: German15001513Muse Spark 1.3
LMArena Text: Japanese14881470Claude Opus 4.6
LMArena Text: Korean14641490Muse Spark 1.3
LMArena Text: French15121511Claude Opus 4.6
LMArena Text: Spanish15101496Claude Opus 4.6
LMArena Text: Russian14971491Claude Opus 4.6
LMArena Text: Polish14991490Claude Opus 4.6
LMArena Text: multi-turn15111487Claude Opus 4.6
LMArena Text: longer queries15181488Claude Opus 4.6
LMArena Text: writing and language15021470Claude Opus 4.6
LMArena Text: entertainment and media14921457Claude Opus 4.6
LMArena Vision: English13241298Claude Opus 4.6
LMArena Vision: Chinese13701384Muse Spark 1.3
LMArena Vision: reading text13261319Claude Opus 4.6
LMArena Vision: humor13141293Claude Opus 4.6
LMArena Vision: recognizing things1274Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: creative writing13311296Claude Opus 4.6
LMArena Document1507Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 11 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Opus 4.6 and Muse Spark 1.3
BenchmarkClaude Opus 4.6Muse 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 4.6$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 4.6$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 4.6$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 4.6 and Muse Spark 1.3
SpecificationAnthropic Claude Opus 4.6Meta Muse Spark 1.3
MakerAnthropicMeta
WeightsNo public weights listedNo public weights listed
ReleasedFebruary 4, 2026September 2, 2026
Context window1M1.05M
Input $/Mtok$5.00$1.25
Output $/Mtok$25.00$4.25
Coding index66.979.7
Independent measurements behind it22
Cost per solved task$1.56Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.6 better than Muse Spark 1.3 for coding?

Pick Muse Spark 1.3 for coding: it scores 79.7 on the Vibe Coding Index against 66.9 for Claude Opus 4.6. Pick Claude Opus 4.6 when what matters is LMArena Text: coding or LMArena Text: software and IT, where it leads.

Which is cheaper, Claude Opus 4.6 or Muse Spark 1.3?

Claude Opus 4.6 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 4.6 only.

Which has the bigger context window, Claude Opus 4.6 or Muse Spark 1.3?

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

How many benchmarks is the Claude Opus 4.6 vs Muse Spark 1.3 comparison based on?

66 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.6's coding index rests on 2 independent benchmarks and Muse Spark 1.3's on 2. 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-opus-4-6-vs-meta-muse-spark-1-3">LLMBenchmark.ai, Claude Opus 4.6 vs Muse Spark 1.3</a></p>