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Claude Opus 4.8 vs Muse Spark 1.1

Updated October 21, 2026. 94 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Opus 4.8 Replace Muse Spark 1.1
Claude Opus 4.8Anthropic
Coding
66.0
Overall
41.8
Output $/M
$25.00
58
Muse Spark 1.1Meta
Coding
48.9
Overall
33.7
Output $/M
$4.25
34
vs boards won of 94 shared, 2 tied

Decision reading

Pick Claude Opus 4.8 for coding: it scores 66.0 on the Vibe Coding Index against 48.9 for Muse Spark 1.1.

Pick Muse Spark 1.1 when output tokens cost 5.9x less, or when a solved task costs $0.43 against $2.17.

Model AClaude Opus 4.8Anthropic66.0/1002 independent benchmarks$2.17 per solved taskModel BMuse Spark 1.1Meta48.9/1001 independent benchmark$0.43 per solved task
Shared results
94
Claude Opus 4.8 only
32
Muse Spark 1.1 only
2
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 4.8 66.0 from 2 benchmarks, Muse Spark 1.1 48.9 from 1 benchmark.
Widest category
Math, 10.8 points apart on average over 3 shared benchmarks.
Widest single gap
Surface Evolver Bench: Claude Opus 4.8 87.5% against Muse Spark 1.1 52.5%, 35.0 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.8 $25.00 against Muse Spark 1.1 $4.25 per million output tokens, 5.9x apart.
Context window
Claude Opus 4.8 takes 1M tokens, Muse Spark 1.1 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 4.8BarsMuse Spark 1.1Ties
Coding113
Intelligence20
Agentic work132
Reasoning811 tie
Math30
Knowledge28
Web design17
General18131 tie
All shared boards58342 ties
CodingLike-for-likeFour of these boards feed the Vibe Coding Index113
Coding benchmarks for Claude Opus 4.8 and Muse Spark 1.1
BenchmarkClaude Opus 4.8Muse Spark 1.1Leader
LiveBench coding77.3%Not measuredOnly Claude Opus 4.8 measured
LMArena WebDev15561542Claude Opus 4.8
AA Coding Index74.371.3Claude Opus 4.8
LiveCodeBench (Vals AI)87.8%85.9%Claude Opus 4.8
SWE-bench Verified (Vals AI)88.6%82.0%Claude Opus 4.8
Terminal-Bench 4 (Vals AI)23.2%Not measuredOnly Claude Opus 4.8 measured
Vibe Code Bench (Vals AI)82.7%72.2%Claude Opus 4.8
Code migration (Vals AI)47.3%31.1%Claude Opus 4.8
ProgramBench (Vals AI)1.0%0.0%Claude Opus 4.8
Terminal-Bench 2.1 (Vals AI)71.9%69.3%Claude Opus 4.8
SkillsBench (Vals AI)59.2%59.2%Claude Opus 4.8
SciCode54.4%58.8%Muse Spark 1.1
Terminal-Bench Hard (Artificial Analysis run)58.3%Not measuredOnly Claude Opus 4.8 measured
FrontierCode46.5%Not measuredOnly Claude Opus 4.8 measured
GSO-Bench47.1%Not measuredOnly Claude Opus 4.8 measured
WeirdML82.9%Not measuredOnly Claude Opus 4.8 measured
LMArena Text: coding14901498Muse Spark 1.1
LMArena Text: software and IT14881498Muse Spark 1.1
LMArena WebDev: React15571532Claude Opus 4.8
LMArena WebDev: HTML15431540Claude Opus 4.8
LMArena WebDev: from an imageNot measured1540Only Muse Spark 1.1 measured
Neither model has a result on the other 17 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Opus 4.8 and Muse Spark 1.1
BenchmarkClaude Opus 4.8Muse Spark 1.1Leader
AA Intelligence Index41.833.7Claude Opus 4.8
Epoch Capabilities Index159.0154.1Claude Opus 4.8
Agentic workLike-for-likePublic boards, shown as published, kept out of the index132
Agentic work benchmarks for Claude Opus 4.8 and Muse Spark 1.1
BenchmarkClaude Opus 4.8Muse Spark 1.1Leader
AA Agentic Index41.925.8Claude Opus 4.8
Design Arena: agents building web apps12331207Claude Opus 4.8
Design Arena: agents building full-stack apps12491199Claude Opus 4.8
Design Arena: agents building mobile apps12221177Claude Opus 4.8
Design Arena: agents building Android apps12371184Claude Opus 4.8
Design Arena: agents building Godot games12311103Claude Opus 4.8
Design Arena: agents building games12381183Claude Opus 4.8
Design Arena: HTML slides12211194Claude Opus 4.8
Design Arena: PowerPoint slides12271156Claude Opus 4.8
Design Arena: spreadsheetsNot measured974Only Muse Spark 1.1 measured
LiveBench research81.8%Not measuredOnly Claude Opus 4.8 measured
LiveBench browser96.0%Not measuredOnly Claude Opus 4.8 measured
LiveBench long agentic48.3%Not measuredOnly Claude Opus 4.8 measured
Finance Agent (Vals AI)53.9%57.2%Muse Spark 1.1
Tax Agent Bench (Vals AI)30.0%Not measuredOnly Claude Opus 4.8 measured
Legal Research Bench (Vals AI)43.8%38.0%Claude Opus 4.8
Excel Modeling Benchmark (Vals AI)69.4%56.4%Claude Opus 4.8
Terminal-Bench-Science (Vals AI)4.3%Not measuredOnly Claude Opus 4.8 measured
Time Horizon Index (Vals AI)11.8%1.7%Claude Opus 4.8
τ²-Bench Telecom94.4%Not measuredOnly Claude Opus 4.8 measured
APEX-Agents48.9%31.8%Claude Opus 4.8
Remote Labor Index8.3%Not measuredOnly Claude Opus 4.8 measured
OSWorld 2.020.6%Not measuredOnly Claude Opus 4.8 measured
DeepResearch Bench50.2%Not measuredOnly Claude Opus 4.8 measured
PostTrainBench33.8%Not measuredOnly Claude Opus 4.8 measured
Vending-Bench 2$5,787$6,520Muse Spark 1.1
LMArena Search1204Not measuredOnly Claude Opus 4.8 measured
Neither model has a result on the other 12 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index81
Reasoning benchmarks for Claude Opus 4.8 and Muse Spark 1.1
BenchmarkClaude Opus 4.8Muse Spark 1.1Leader
GPQA Diamond92.4%91.2%Claude Opus 4.8
LiveBench reasoning89.2%Not measuredOnly Claude Opus 4.8 measured
MMMU Pro (Vals AI)86.6%86.6%Tie
GPQA Diamond (Artificial Analysis run)92.0%89.8%Claude Opus 4.8
Humanity's Last Exam (Artificial Analysis run)48.7%46.2%Claude Opus 4.8
GPQA Diamond (Epoch AI run)91.0%Not measuredOnly Claude Opus 4.8 measured
ARC-AGI92.5%Not measuredOnly Claude Opus 4.8 measured
ARC-AGI-272.1%Not measuredOnly Claude Opus 4.8 measured
SimpleBench64.8%Not measuredOnly Claude Opus 4.8 measured
Chess puzzles52.0%34.0%Claude Opus 4.8
Mystery game puzzles36.0%Not measuredOnly Claude Opus 4.8 measured
EBR-bench28.6%Not measuredOnly Claude Opus 4.8 measured
LMArena Text: hard prompts14821485Muse Spark 1.1
LMArena Text: expert15031478Claude Opus 4.8
LMArena Text: hard prompts in English14871480Claude Opus 4.8
LMArena Vision: diagrams13151305Claude Opus 4.8
LMArena Vision: homework13371287Claude Opus 4.8
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 4.8 and Muse Spark 1.1
BenchmarkClaude Opus 4.8Muse Spark 1.1Leader
OTIS Mock AIME98.3%Not measuredOnly Claude Opus 4.8 measured
FrontierMath, tiers 1 to 380.0%Not measuredOnly Claude Opus 4.8 measured
FrontierMath, tier 456.1%Not measuredOnly Claude Opus 4.8 measured
ProofBench69.0%39.0%Claude Opus 4.8
LMArena Text: math14861482Claude Opus 4.8
LMArena Text: mathematical work14971487Claude Opus 4.8
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index28
Knowledge benchmarks for Claude Opus 4.8 and Muse Spark 1.1
BenchmarkClaude Opus 4.8Muse Spark 1.1Leader
MMLU Pro89.6%88.7%Claude Opus 4.8
LegalBench (Vals AI)83.6%85.0%Muse Spark 1.1
CorpFin (Vals AI)66.7%71.3%Muse Spark 1.1
TaxEval (Vals AI)75.6%79.7%Muse Spark 1.1
MortgageTax (Vals AI)69.9%66.1%Claude Opus 4.8
MedCode (Vals AI)53.2%Not measuredOnly Claude Opus 4.8 measured
SimpleQA Verified53.0%57.8%Muse Spark 1.1
LMArena Text: science14771484Muse Spark 1.1
LMArena Text: medicine and healthcare14641479Muse Spark 1.1
LMArena Text: legal and government14771481Muse Spark 1.1
LMArena Text: business and finance14581470Muse Spark 1.1
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index17
Web design benchmarks for Claude Opus 4.8 and Muse Spark 1.1
BenchmarkClaude Opus 4.8Muse Spark 1.1Leader
Design Arena: websites12581270Muse Spark 1.1
Design Arena: UI components12561290Muse Spark 1.1
Design Arena: game dev12641269Muse Spark 1.1
Design Arena: data viz12401268Muse Spark 1.1
Design Arena: 3D12231260Muse Spark 1.1
Design Arena: all code categories12551276Muse Spark 1.1
Design Arena: SVG11941234Muse Spark 1.1
Design Arena: ASCII art12761270Claude Opus 4.8
LiveBench design78.8%Not measuredOnly Claude Opus 4.8 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index1813
General benchmarks for Claude Opus 4.8 and Muse Spark 1.1
BenchmarkClaude Opus 4.8Muse Spark 1.1Leader
LiveBench data analysis66.0%Not measuredOnly Claude Opus 4.8 measured
Public Benefits Bench (Vals AI)68.1%61.3%Claude Opus 4.8
SAGE (Vals AI)54.8%45.6%Claude Opus 4.8
MedScribe (Vals AI)85.8%88.9%Muse Spark 1.1
Vals Multimodal Index70.9%66.7%Claude Opus 4.8
IFBench62.2%Not measuredOnly Claude Opus 4.8 measured
Long context reasoning (AA-LCR)77.7%77.7%Tie
DTBench94.9%94.4%Claude Opus 4.8
LMCA57.5%49.9%Claude Opus 4.8
Surface Evolver Bench87.5%52.5%Claude Opus 4.8
Furniture assembly42.5%Not measuredOnly Claude Opus 4.8 measured
LMArena Text14611478Muse Spark 1.1
LMArena Text: instruction following14761457Claude Opus 4.8
LMArena Text: creative writing14541435Claude Opus 4.8
LMArena Vision12941293Claude Opus 4.8
LMArena Text: English14681478Muse Spark 1.1
LMArena Text: non-English14501471Muse Spark 1.1
LMArena Text: Chinese15061515Muse Spark 1.1
LMArena Text: German14721469Claude Opus 4.8
LMArena Text: Japanese14421450Muse Spark 1.1
LMArena Text: Korean14311459Muse Spark 1.1
LMArena Text: French14811492Muse Spark 1.1
LMArena Text: Spanish14651464Claude Opus 4.8
LMArena Text: Russian14741482Muse Spark 1.1
LMArena Text: Polish14591499Muse Spark 1.1
LMArena Text: multi-turn14761484Muse Spark 1.1
LMArena Text: longer queries14831462Claude Opus 4.8
LMArena Text: writing and language14611448Claude Opus 4.8
LMArena Text: entertainment and media14401438Claude Opus 4.8
LMArena Vision: English12931292Claude Opus 4.8
LMArena Vision: Chinese13461348Muse Spark 1.1
LMArena Vision: reading text13031301Claude Opus 4.8
LMArena Vision: humor12821288Muse Spark 1.1
LMArena Vision: creative writing13011253Claude Opus 4.8
LMArena Document14751465Claude Opus 4.8
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 4.8 and Muse Spark 1.1
BenchmarkClaude Opus 4.8Muse Spark 1.1Leader
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 4.8$0.018Fits in one request
Muse Spark 1.1$0.0034Fits in one request

Muse Spark 1.1 costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.8$0.325Fits in one request
Muse Spark 1.1$0.075Fits in one request

Muse Spark 1.1 costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.8$1.25Fits in one request
Muse Spark 1.1$0.292Fits in one request

Muse Spark 1.1 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 4.8 and Muse Spark 1.1
SpecificationAnthropic Claude Opus 4.8Meta Muse Spark 1.1
MakerAnthropicMeta
WeightsNo public weights listedNo public weights listed
ReleasedMay 27, 2026July 16, 2026
Context window1M1.05M
Input $/Mtok$5.00$1.25
Output $/Mtok$25.00$4.25
Coding index66.048.9
Independent measurements behind it21
Cost per solved task$2.17$0.43
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.8 better than Muse Spark 1.1 for coding?

Pick Claude Opus 4.8 for coding: it scores 66.0 on the Vibe Coding Index against 48.9 for Muse Spark 1.1. Pick Muse Spark 1.1 when output tokens cost 5.9x less, or when a solved task costs $0.43 against $2.17.

Which is cheaper, Claude Opus 4.8 or Muse Spark 1.1?

Claude Opus 4.8 costs $5.00 per million input tokens and $25.00 per million output tokens; Muse Spark 1.1 costs $1.25 and $4.25. Per solved SWE-bench Verified task, Claude Opus 4.8 costs $2.17 and Muse Spark 1.1 $0.43.

Which has the bigger context window, Claude Opus 4.8 or Muse Spark 1.1?

Muse Spark 1.1, with 1.05M tokens against 1M.

How many benchmarks is the Claude Opus 4.8 vs Muse Spark 1.1 comparison based on?

94 benchmarks have a result for both models as of October 21, 2026. Claude Opus 4.8's coding index rests on 2 independent benchmarks and Muse Spark 1.1's on 1. Where only one model has a result, the page says so instead of naming a winner.

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