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Claude Opus 5 vs Muse Spark 1.2

Claude Opus 5 leads Muse Spark 1.2 on coding, 83.0 to 55.7 on the Vibe Coding Index, and Muse Spark 1.2 costs 5.9x less per output token ($4.25 vs $25.00 per million). Updated October 22, 2026; 96 benchmarks have a result for both.

Replace Claude Opus 5 Replace Muse Spark 1.2
Claude Opus 5Anthropic
Coding
83.0
Overall
81.6
Output $/M
$25.00
87
Muse Spark 1.2Meta
Coding
55.7
Overall
60.4
Output $/M
$4.25
9
vs boards won of 96 shared

Claude Opus 5 or Muse Spark 1.2: which to pick

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 55.7 for Muse Spark 1.2.

Pick Muse Spark 1.2 for output tokens 5.9x cheaper ($4.25 vs $25.00 per million) and a lower cost per solved task ($0.64 against $1.33).

Model AClaude Opus 5Anthropic83.0/1006 independent benchmarks$1.33 per solved taskModel BMuse Spark 1.2Meta55.7/1005 independent benchmarks$0.64 per solved task
Shared results
96
Claude Opus 5 only
35
Muse Spark 1.2 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 1.2 55.7 from 5 benchmarks.
Widest category
Math, 25.0 points apart on average over 3 shared benchmarks.
Widest single gap
Terminal-Bench 4 (Vals AI): Claude Opus 5 53.5% against Muse Spark 1.2 6.1%, 63.3 points apart on a 0 to 100 scale.
Output price
Claude Opus 5 $25.00 against Muse Spark 1.2 $4.25 per million output tokens, 5.9x apart.
Context window
Claude Opus 5 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 5BarsMuse Spark 1.2Ties
Coding172
Intelligence20
Agentic work161
Reasoning100
Math30
Knowledge92
Web design72
General232
All shared boards879
CodingLike-for-likeSix of these boards feed the Vibe Coding Index172
Coding benchmarks for Claude Opus 5 and Muse Spark 1.2
BenchmarkClaude Opus 5Muse Spark 1.2Leader
LiveBench coding90.8%78.2%Claude Opus 5
LMArena WebDev16891534Claude Opus 5
AA Coding Index78.072.2Claude Opus 5
LiveCodeBench (Vals AI)89.0%Not measuredOnly Claude Opus 5 measured
SWE-bench Verified (Vals AI)97.0%86.6%Claude Opus 5
Terminal-Bench 4 (Vals AI)53.5%6.1%Claude Opus 5
Vibe Code Bench (Vals AI)88.4%79.1%Claude Opus 5
Code migration (Vals AI)57.5%29.9%Claude Opus 5
ProgramBench (Vals AI)3.0%0.5%Claude Opus 5
IOI (Vals AI)84.3%21.8%Claude Opus 5
Terminal-Bench 2.1 (Vals AI)84.6%69.7%Claude Opus 5
Vibe Code Bench 1-100 (Vals AI)28.5%Not measuredOnly Claude Opus 5 measured
SkillsBench (Vals AI)60.4%53.0%Claude Opus 5
CyberBench (Vals AI)65.4%69.5%Muse Spark 1.2
SciCode56.4%57.4%Muse Spark 1.2
FrontierCode53.4%Not measuredOnly Claude Opus 5 measured
FrontierSWE52.0%12.0%Claude Opus 5
WeirdML91.8%60.3%Claude Opus 5
ALE-Bench2164.6Not measuredOnly Claude Opus 5 measured
LMArena Text: coding15331505Claude Opus 5
LMArena Text: software and IT15271505Claude Opus 5
LMArena WebDev: React17111526Claude Opus 5
LMArena WebDev: HTML16801543Claude Opus 5
LMArena WebDev: from an image1662Not measuredOnly Claude Opus 5 measured
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 1.2
BenchmarkClaude Opus 5Muse Spark 1.2Leader
AA Intelligence Index50.839.6Claude Opus 5
Epoch Capabilities Index163.9155.1Claude Opus 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index161
Agentic work benchmarks for Claude Opus 5 and Muse Spark 1.2
BenchmarkClaude Opus 5Muse Spark 1.2Leader
AA Agentic Index56.543.2Claude Opus 5
Design Arena: agents building web apps12661221Claude Opus 5
Design Arena: agents building full-stack apps13061210Claude Opus 5
Design Arena: agents building mobile apps13481181Claude Opus 5
Design Arena: agents building Android apps12571222Claude Opus 5
Design Arena: agents building Godot games1279Not measuredOnly Claude Opus 5 measured
Design Arena: agents building games12611179Claude Opus 5
Design Arena: HTML slidesNot measured1085Only Muse Spark 1.2 measured
Design Arena: PowerPoint slides12401172Claude Opus 5
LiveBench research88.9%67.7%Claude Opus 5
LiveBench browser84.0%36.0%Claude Opus 5
LiveBench long agentic62.1%21.3%Claude Opus 5
SREBench (Vals AI)12.2%0.0%Claude Opus 5
Finance Agent (Vals AI)58.6%60.6%Muse Spark 1.2
Tax Agent Bench (Vals AI)45.5%32.8%Claude Opus 5
Legal Research Bench (Vals AI)55.3%43.8%Claude Opus 5
Excel Modeling Benchmark (Vals AI)73.6%57.0%Claude Opus 5
BioMysteryBench (Vals AI)79.3%64.8%Claude Opus 5
Terminal-Bench-Science (Vals AI)27.1%Not measuredOnly Claude Opus 5 measured
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%45.4%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 index100
Reasoning benchmarks for Claude Opus 5 and Muse Spark 1.2
BenchmarkClaude Opus 5Muse Spark 1.2Leader
GPQA Diamond93.4%Not measuredOnly Claude Opus 5 measured
LiveBench reasoning91.2%90.0%Claude Opus 5
MysteryMechanism (Vals AI)37.4%Not measuredOnly Claude Opus 5 measured
MMMU Pro (Vals AI)89.9%86.1%Claude Opus 5
GPQA Diamond (Artificial Analysis run)93.7%90.4%Claude Opus 5
Humanity's Last Exam (Artificial Analysis run)54.9%45.5%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%74.5%Claude Opus 5
Chess puzzles43.0%27.0%Claude Opus 5
Mystery game puzzles59.0%Not measuredOnly Claude Opus 5 measured
EBR-bench45.7%Not measuredOnly Claude Opus 5 measured
LMArena Text: hard prompts15271489Claude Opus 5
LMArena Text: expert15541475Claude Opus 5
LMArena Text: hard prompts in English15231487Claude Opus 5
LMArena Vision: diagrams13481317Claude Opus 5
LMArena Vision: homework1338Not measuredOnly Claude Opus 5 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 5 and Muse Spark 1.2
BenchmarkClaude Opus 5Muse Spark 1.2Leader
OTIS Mock AIME98.9%Not measuredOnly Claude Opus 5 measured
FrontierMath, tiers 1 to 385.6%Not measuredOnly Claude Opus 5 measured
FrontierMath, tier 473.2%Not measuredOnly Claude Opus 5 measured
ProofBench99.0%43.0%Claude Opus 5
LMArena Text: math15331484Claude Opus 5
LMArena Text: mathematical work15441480Claude Opus 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index92
Knowledge benchmarks for Claude Opus 5 and Muse Spark 1.2
BenchmarkClaude Opus 5Muse Spark 1.2Leader
MMLU Pro91.6%88.3%Claude Opus 5
LegalBench (Vals AI)87.0%85.3%Claude Opus 5
CorpFin (Vals AI)73.2%70.9%Claude Opus 5
TaxEval (Vals AI)75.1%80.4%Muse Spark 1.2
MortgageTax (Vals AI)72.1%65.4%Claude Opus 5
MedCode (Vals AI)63.6%49.4%Claude Opus 5
SimpleQA Verified59.9%60.3%Muse Spark 1.2
LMArena Text: science15311500Claude Opus 5
LMArena Text: medicine and healthcare15251496Claude Opus 5
LMArena Text: legal and government15301517Claude Opus 5
LMArena Text: business and finance15011484Claude 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 index72
Web design benchmarks for Claude Opus 5 and Muse Spark 1.2
BenchmarkClaude Opus 5Muse Spark 1.2Leader
Design Arena: websites13091312Muse Spark 1.2
Design Arena: UI components13461298Claude Opus 5
Design Arena: game dev13371301Claude Opus 5
Design Arena: data viz13291334Muse Spark 1.2
Design Arena: 3D13341301Claude Opus 5
Design Arena: all code categories13231312Claude Opus 5
Design Arena: SVG13111284Claude Opus 5
Design Arena: ASCII art13521284Claude Opus 5
LiveBench design83.0%67.1%Claude Opus 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index232
General benchmarks for Claude Opus 5 and Muse Spark 1.2
BenchmarkClaude Opus 5Muse Spark 1.2Leader
LiveBench data analysis74.6%76.5%Muse Spark 1.2
Public Benefits Bench (Vals AI)76.9%68.5%Claude Opus 5
SAGE (Vals AI)49.4%47.7%Claude Opus 5
MedScribe (Vals AI)91.0%90.1%Claude Opus 5
Vals Multimodal Index73.9%69.8%Claude Opus 5
Long context reasoning (AA-LCR)82.0%79.0%Claude Opus 5
DTBench97.9%94.7%Claude Opus 5
LMCA64.5%48.4%Claude Opus 5
Furniture assembly60.8%Not measuredOnly Claude Opus 5 measured
LMArena Text15091482Claude Opus 5
LMArena Text: instruction following15181462Claude Opus 5
LMArena Text: creative writing14931436Claude Opus 5
LMArena Vision13201304Claude Opus 5
LMArena Text: English15081483Claude Opus 5
LMArena Text: non-English15021476Claude Opus 5
LMArena Text: Chinese15731509Claude Opus 5
LMArena Text: German1527Not measuredOnly Claude Opus 5 measured
LMArena Text: Japanese1520Not measuredOnly Claude Opus 5 measured
LMArena Text: Korean15171462Claude Opus 5
LMArena Text: French15191495Claude Opus 5
LMArena Text: Spanish15231484Claude Opus 5
LMArena Text: Russian15071483Claude Opus 5
LMArena Text: Polish1522Not measuredOnly Claude Opus 5 measured
LMArena Text: multi-turn15001502Muse Spark 1.2
LMArena Text: longer queries15171473Claude Opus 5
LMArena Text: writing and language14991453Claude Opus 5
LMArena Text: entertainment and media14811443Claude Opus 5
LMArena Vision: English13151291Claude Opus 5
LMArena Vision: Chinese1400Not measuredOnly Claude Opus 5 measured
LMArena Vision: reading text13291313Claude Opus 5
LMArena Vision: humor1293Not measuredOnly Claude Opus 5 measured
LMArena Vision: creative writing1313Not measuredOnly Claude Opus 5 measured
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 1.2
BenchmarkClaude Opus 5Muse 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 5$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 5$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 5$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 5 and Muse Spark 1.2
SpecificationAnthropic Claude Opus 5Meta Muse Spark 1.2
MakerAnthropicMeta
WeightsNo public weights listedNo public weights listed
ReleasedJuly 24, 2026August 5, 2026
Context window1M1.05M
Input $/Mtok$5.00$1.25
Output $/Mtok$25.00$4.25
Coding index83.055.7
Independent measurements behind it65
Cost per solved task$1.33$0.64
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 5 better than Muse Spark 1.2 for coding?

Pick Claude Opus 5 for coding: it scores 83.0 on the Vibe Coding Index against 55.7 for Muse Spark 1.2. Pick Muse Spark 1.2 for output tokens 5.9x cheaper ($4.25 vs $25.00 per million) and a lower cost per solved task ($0.64 against $1.33).

Which is cheaper, Claude Opus 5 or Muse Spark 1.2?

Claude Opus 5 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 5 costs $1.33 and Muse Spark 1.2 $0.64.

Which has the bigger context window, Claude Opus 5 or Muse Spark 1.2?

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

How many benchmarks is the Claude Opus 5 vs Muse Spark 1.2 comparison based on?

96 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 1.2's on 5. 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-1-2" title="Claude Opus 5 vs Muse Spark 1.2, 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-1-2">LLMBenchmark.ai, Claude Opus 5 vs Muse Spark 1.2</a></p>