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Claude Opus 4.6 vs Muse Spark 1.2

Updated October 21, 2026. 69 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 1.2
Claude Opus 4.6Anthropic
Coding
66.9
Overall
31.9
Output $/M
$25.00
43
Muse Spark 1.2Meta
Coding
65.1
Overall
39.6
Output $/M
$4.25
26
vs boards won of 69 shared

Decision reading

Claude Opus 4.6 and Muse Spark 1.2 are level for coding, 66.9 against 65.1 on the Vibe Coding Index, so price and context decide.

Pick Muse Spark 1.2 when output tokens cost 5.9x less, or when a solved task costs $0.64 against $1.56. Pick Claude Opus 4.6 when what matters is LMArena WebDev or WeirdML, where it leads.

Model AClaude Opus 4.6Anthropic66.9/1002 independent benchmarks$1.56 per solved taskModel BMuse Spark 1.2Meta65.1/1002 independent benchmarks$0.64 per solved task
Shared results
69
Claude Opus 4.6 only
39
Muse Spark 1.2 only
28
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 1.2 65.1 from 2 benchmarks.
Widest category
Coding, 7.9 points apart on average over 8 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Claude Opus 4.6 57.6% against Muse Spark 1.2 79.1%, 21.5 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.6 $25.00 against Muse Spark 1.2 $4.25 per million output tokens, 5.9x apart.
Context window
Claude Opus 4.6 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 Opus 4.6BarsMuse Spark 1.2Ties
Coding62
Intelligence11
Agentic work42
Reasoning45
Math30
Knowledge65
Web design08
General193
All shared boards4326
CodingLike-for-likeFour of these boards feed the Vibe Coding Index62
Coding benchmarks for Claude Opus 4.6 and Muse Spark 1.2
BenchmarkClaude Opus 4.6Muse Spark 1.2Leader
SWE-bench Verified75.6%Not measuredOnly Claude Opus 4.6 measured
SWE-bench Multilingual72.0%Not measuredOnly Claude Opus 4.6 measured
LiveBench codingNot measured78.2%Only Muse Spark 1.2 measured
LMArena WebDev15471534Claude Opus 4.6
AA Coding IndexNot measured72.2Only Muse Spark 1.2 measured
LiveCodeBench (Vals AI)84.7%Not measuredOnly Claude Opus 4.6 measured
SWE-bench Verified (Vals AI)78.2%86.6%Muse Spark 1.2
Terminal-Bench 4 (Vals AI)Not measured6.1%Only Muse Spark 1.2 measured
Vibe Code Bench (Vals AI)57.6%79.1%Muse Spark 1.2
Code migration (Vals AI)Not measured29.9%Only Muse Spark 1.2 measured
ProgramBench (Vals AI)Not measured0.5%Only Muse Spark 1.2 measured
IOI (Vals AI)Not measured21.8%Only Muse Spark 1.2 measured
Terminal-Bench 2.1 (Vals AI)Not measured69.7%Only Muse Spark 1.2 measured
SkillsBench (Vals AI)Not measured53.0%Only Muse Spark 1.2 measured
CyberBench (Vals AI)Not measured69.5%Only Muse Spark 1.2 measured
SciCodeNot measured57.4%Only Muse Spark 1.2 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 measured12.0%Only Muse Spark 1.2 measured
GSO-Bench41.2%Not measuredOnly Claude Opus 4.6 measured
WeirdML78.0%60.3%Claude Opus 4.6
Cybench93.0%Not measuredOnly Claude Opus 4.6 measured
LMArena Text: coding15341505Claude Opus 4.6
LMArena Text: software and IT15271505Claude Opus 4.6
LMArena WebDev: React15391526Claude Opus 4.6
LMArena WebDev: HTML15591543Claude Opus 4.6
LMArena WebDev: from an image1543Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 10 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for Claude Opus 4.6 and Muse Spark 1.2
BenchmarkClaude Opus 4.6Muse Spark 1.2Leader
AA Intelligence Index31.939.6Muse Spark 1.2
Epoch Capabilities Index155.7155.1Claude Opus 4.6
Agentic workLike-for-likePublic boards, shown as published, kept out of the index42
Agentic work benchmarks for Claude Opus 4.6 and Muse Spark 1.2
BenchmarkClaude Opus 4.6Muse Spark 1.2Leader
AA Agentic IndexNot measured43.2Only Muse Spark 1.2 measured
Design Arena: agents building web apps12061222Muse Spark 1.2
Design Arena: agents building full-stack apps12201210Claude Opus 4.6
Design Arena: agents building mobile apps12071182Claude Opus 4.6
Design Arena: agents building Android apps12041228Muse Spark 1.2
Design Arena: agents building games12141179Claude Opus 4.6
Design Arena: HTML slidesNot measured1135Only Muse Spark 1.2 measured
Design Arena: PowerPoint slidesNot measured1198Only Muse Spark 1.2 measured
LiveBench researchNot measured67.7%Only Muse Spark 1.2 measured
LiveBench browserNot measured36.0%Only Muse Spark 1.2 measured
LiveBench long agenticNot measured21.3%Only Muse Spark 1.2 measured
SREBench (Vals AI)Not measured0.0%Only Muse Spark 1.2 measured
Finance Agent (Vals AI)Not measured60.6%Only Muse Spark 1.2 measured
Tax Agent Bench (Vals AI)Not measured32.8%Only Muse Spark 1.2 measured
Legal Research Bench (Vals AI)Not measured43.8%Only Muse Spark 1.2 measured
Excel Modeling Benchmark (Vals AI)Not measured57.0%Only Muse Spark 1.2 measured
BioMysteryBench (Vals AI)Not measured64.8%Only Muse Spark 1.2 measured
τ²-Bench Telecom92.1%Not measuredOnly Claude Opus 4.6 measured
APEX-Agents46.3%45.4%Claude Opus 4.6
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 index45
Reasoning benchmarks for Claude Opus 4.6 and Muse Spark 1.2
BenchmarkClaude Opus 4.6Muse Spark 1.2Leader
GPQA Diamond89.7%Not measuredOnly Claude Opus 4.6 measured
LiveBench reasoningNot measured90.0%Only Muse Spark 1.2 measured
MMMU Pro (Vals AI)83.9%86.1%Muse Spark 1.2
GPQA Diamond (Artificial Analysis run)89.6%90.4%Muse Spark 1.2
Humanity's Last Exam (Artificial Analysis run)39.9%45.5%Muse Spark 1.2
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%74.5%Muse Spark 1.2
Chess puzzles21.0%27.0%Muse Spark 1.2
Mystery game puzzles25.0%Not measuredOnly Claude Opus 4.6 measured
EBR-bench12.7%Not measuredOnly Claude Opus 4.6 measured
LMArena Text: hard prompts15251489Claude Opus 4.6
LMArena Text: expert15441475Claude Opus 4.6
LMArena Text: hard prompts in English15301487Claude Opus 4.6
LMArena Vision: diagrams13401317Claude Opus 4.6
LMArena Vision: homework1337Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for Claude Opus 4.6 and Muse Spark 1.2
BenchmarkClaude Opus 4.6Muse Spark 1.2Leader
AIME95.6%Not measuredOnly Claude Opus 4.6 measured
OTIS Mock AIME94.4%Not measuredOnly Claude Opus 4.6 measured
FrontierMath, tiers 1 to 366.0%Not measuredOnly Claude Opus 4.6 measured
FrontierMath, tier 426.8%Not measuredOnly Claude Opus 4.6 measured
ProofBench50.0%43.0%Claude Opus 4.6
LMArena Text: math15181484Claude Opus 4.6
LMArena Text: mathematical work15251480Claude 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 index65
Knowledge benchmarks for Claude Opus 4.6 and Muse Spark 1.2
BenchmarkClaude Opus 4.6Muse Spark 1.2Leader
MMLU Pro89.1%88.3%Claude Opus 4.6
LegalBench (Vals AI)85.3%85.3%Claude Opus 4.6
CaseLaw (Vals AI)62.1%Not measuredOnly Claude Opus 4.6 measured
CorpFin (Vals AI)67.0%70.9%Muse Spark 1.2
TaxEval (Vals AI)76.0%80.4%Muse Spark 1.2
MortgageTax (Vals AI)68.5%65.4%Claude Opus 4.6
MedQA (Vals AI)95.4%Not measuredOnly Claude Opus 4.6 measured
MedCode (Vals AI)49.1%49.4%Muse Spark 1.2
SimpleQA Verified47.0%60.3%Muse Spark 1.2
LMArena Text: science15191500Claude Opus 4.6
LMArena Text: medicine and healthcare15041496Claude Opus 4.6
LMArena Text: legal and government15121517Muse Spark 1.2
LMArena Text: business and finance14971484Claude 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 1.2
BenchmarkClaude Opus 4.6Muse Spark 1.2Leader
Design Arena: websites12911313Muse Spark 1.2
Design Arena: UI components12841300Muse Spark 1.2
Design Arena: game dev12781302Muse Spark 1.2
Design Arena: data viz12791334Muse Spark 1.2
Design Arena: 3D12741301Muse Spark 1.2
Design Arena: all code categories12891313Muse Spark 1.2
Design Arena: SVG12271285Muse Spark 1.2
Design Arena: ASCII art12541284Muse Spark 1.2
LiveBench designNot measured67.1%Only Muse Spark 1.2 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index193
General benchmarks for Claude Opus 4.6 and Muse Spark 1.2
BenchmarkClaude Opus 4.6Muse Spark 1.2Leader
LiveBench data analysisNot measured76.5%Only Muse Spark 1.2 measured
Public Benefits Bench (Vals AI)Not measured68.5%Only Muse Spark 1.2 measured
SAGE (Vals AI)51.6%47.7%Claude Opus 4.6
MedScribe (Vals AI)86.7%90.1%Muse Spark 1.2
Vals Multimodal IndexNot measured69.8%Only Muse Spark 1.2 measured
IFBench53.1%Not measuredOnly Claude Opus 4.6 measured
Long context reasoning (AA-LCR)78.0%79.0%Muse Spark 1.2
DTBench91.2%94.7%Muse Spark 1.2
LMCA55.8%48.4%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 Text15011482Claude Opus 4.6
LMArena Text: instruction following15211462Claude Opus 4.6
LMArena Text: creative writing15051436Claude Opus 4.6
LMArena Vision13161304Claude Opus 4.6
LMArena Text: English15111483Claude Opus 4.6
LMArena Text: non-English14881476Claude Opus 4.6
LMArena Text: Chinese15511509Claude Opus 4.6
LMArena Text: German1500Not measuredOnly Claude Opus 4.6 measured
LMArena Text: Japanese1488Not measuredOnly Claude Opus 4.6 measured
LMArena Text: Korean14641462Claude Opus 4.6
LMArena Text: French15121495Claude Opus 4.6
LMArena Text: Spanish15101484Claude Opus 4.6
LMArena Text: Russian14971483Claude Opus 4.6
LMArena Text: Polish1499Not measuredOnly Claude Opus 4.6 measured
LMArena Text: multi-turn15111502Claude Opus 4.6
LMArena Text: longer queries15181473Claude Opus 4.6
LMArena Text: writing and language15021453Claude Opus 4.6
LMArena Text: entertainment and media14921443Claude Opus 4.6
LMArena Vision: English13241291Claude Opus 4.6
LMArena Vision: Chinese1370Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: reading text13261313Claude Opus 4.6
LMArena Vision: humor1314Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: recognizing things1274Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: creative writing1331Not measuredOnly Claude Opus 4.6 measured
LMArena Document1507Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 9 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 1.2
BenchmarkClaude Opus 4.6Muse 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 Opus 4.6$0.018Fits 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 Opus 4.6$0.325Fits 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 Opus 4.6$1.25Fits 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 Opus 4.6 and Muse Spark 1.2
SpecificationAnthropic Claude Opus 4.6Meta Muse Spark 1.2
MakerAnthropicMeta
WeightsNo public weights listedNo public weights listed
ReleasedFebruary 4, 2026August 5, 2026
Context window1M1.05M
Input $/Mtok$5.00$1.25
Output $/Mtok$25.00$4.25
Coding index66.965.1
Independent measurements behind it22
Cost per solved task$1.56$0.64
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.6 better than Muse Spark 1.2 for coding?

Claude Opus 4.6 and Muse Spark 1.2 are level for coding, 66.9 against 65.1 on the Vibe Coding Index, so price and context decide. Pick Muse Spark 1.2 when output tokens cost 5.9x less, or when a solved task costs $0.64 against $1.56. Pick Claude Opus 4.6 when what matters is LMArena WebDev or WeirdML, where it leads.

Which is cheaper, Claude Opus 4.6 or Muse Spark 1.2?

Claude Opus 4.6 costs $5.00 per million input tokens and $25.00 per million output tokens; Muse Spark 1.2 costs $1.25 and $4.25. Per solved SWE-bench Verified task, Claude Opus 4.6 costs $1.56 and Muse Spark 1.2 $0.64.

Which has the bigger context window, Claude Opus 4.6 or Muse Spark 1.2?

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

How many benchmarks is the Claude Opus 4.6 vs Muse Spark 1.2 comparison based on?

69 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 1.2'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-1-2">LLMBenchmark.ai, Claude Opus 4.6 vs Muse Spark 1.2</a></p>