Claude Opus 4.1 vs Muse Spark 1.3

Muse Spark 1.3 leads Claude Opus 4.1 on the Artificial Analysis Intelligence Index, 48.1 to 22.8, and Muse Spark 1.3 costs 17.6x less per output token ($4.25 vs $75.00 per million). Updated October 22, 2026; 46 benchmarks have a result for both.

Replace Claude Opus 4.1 Replace Muse Spark 1.3

Claude Opus 4.1Anthropic

Coding: No data
Overall: 50.2
Output $/M: $75.00

Muse Spark 1.3Meta

Coding: 57.4
Overall: 68.6
Output $/M: $4.25

vs boards won of 46 shared

Claude Opus 4.1 or Muse Spark 1.3: which to pick

Only Muse Spark 1.3 has a coding score, 57.4 on the Vibe Coding Index; Claude Opus 4.1 has none, so the two cannot be ranked on coding.

Compare them on price, context and the boards below.

Model AClaude Opus 4.1AnthropicNot benchmarked1 independent benchmarkNo cost per solved task Model BMuse Spark 1.3Meta57.4/1004 independent benchmarksNo cost per solved task

462746

Shared results: 46
Claude Opus 4.1 only: 27
Muse Spark 1.3 only: 46
Like-for-like categories: 7 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.

Coding
Vibe Coding Index, six public coding benchmarks
No call
Only Muse Spark 1.3 has a coding score, so no call is made.
One side not measured
Intelligence
AA Intelligence Index
Muse Spark 1.3
Muse Spark 1.3 leads, 48.1 against 22.8.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Muse Spark 1.3 has a AA Agentic Index result, 55.5.
Directional only
Reasoning
GPQA Diamond
No call
Only Claude Opus 4.1 has a GPQA Diamond result, 76.3%.
Directional only
Math
AIME
No call
Only Claude Opus 4.1 has a AIME result, 78.2%.
Directional only
Knowledge
MMLU Pro
No call
Only Claude Opus 4.1 has a MMLU Pro result, 87.9%.
Directional only
Web design
Design Arena: websites
Muse Spark 1.3
Muse Spark 1.3 leads, 1356 against 1176.
Same board, both measured
Long documents
Listed context window
Muse Spark 1.3
Muse Spark 1.3 takes 1.05M tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Muse Spark 1.3
Claude Opus 4.1 $0.052, Muse Spark 1.3 $0.0034 per turn.
List prices

At a glance

Coding index: Claude Opus 4.1 not benchmarked, Muse Spark 1.3 57.4 from 4 benchmarks.
Widest category: Math, 31.3 points apart on average over 5 shared benchmarks.
Widest single gap: FrontierMath, tiers 1 to 3: Claude Opus 4.1 12.6% against Muse Spark 1.3 74.4%, 61.8 points apart on a 0 to 100 scale.
Output price: Claude Opus 4.1 $75.00 against Muse Spark 1.3 $4.25 per million output tokens, 17.6x apart.
Context window: Claude Opus 4.1 takes 200K 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
Category	Claude Opus 4.1	Bars	Muse Spark 1.3	Ties
Coding	0		4
Intelligence	0		2
Reasoning	0		4
Math	0		5
Knowledge	0		4
Web design	0		8
General	0		19
All shared boards	0		46

CodingLike-for-likeSix of these boards feed the Vibe Coding Index04

Coding benchmarks for Claude Opus 4.1 and Muse Spark 1.3
Benchmark	Claude Opus 4.1	Muse Spark 1.3	Leader
LiveBench coding	Not measured	90.2%	Only Muse Spark 1.3 measured
LMArena WebDev	1390	1659	Muse Spark 1.3
AA Coding Index	Not measured	75.8	Only Muse Spark 1.3 measured
LiveCodeBench (Vals AI)	66.5%	Not measured	Only Claude Opus 4.1 measured
Terminal-Bench 4 (Vals AI)	Not measured	10.6%	Only Muse Spark 1.3 measured
Vibe Code Bench (Vals AI)	Not measured	82.9%	Only Muse Spark 1.3 measured
Code migration (Vals AI)	Not measured	27.6%	Only Muse Spark 1.3 measured
ProgramBench (Vals AI)	Not measured	0.5%	Only Muse Spark 1.3 measured
IOI (Vals AI)	Not measured	43.9%	Only Muse Spark 1.3 measured
Terminal-Bench 2.1 (Vals AI)	Not measured	72.3%	Only Muse Spark 1.3 measured
CyberBench (Vals AI)	Not measured	69.4%	Only Muse Spark 1.3 measured
SciCode	Not measured	59.7%	Only Muse Spark 1.3 measured
Terminal-Bench	38.0%	Not measured	Only Claude Opus 4.1 measured
FrontierSWE	Not measured	25.8%	Only Muse Spark 1.3 measured
WeirdML	45.9%	Not measured	Only Claude Opus 4.1 measured
Cybench	42.0%	Not measured	Only Claude Opus 4.1 measured
ALE-Bench	Not measured	1688.3	Only Muse Spark 1.3 measured
LMArena Text: coding	1479	1510	Muse Spark 1.3
LMArena Text: software and IT	1456	1511	Muse Spark 1.3
LMArena WebDev: React	Not measured	1672	Only Muse Spark 1.3 measured
LMArena WebDev: HTML	1399	1653	Muse Spark 1.3
LMArena WebDev: from an image	Not measured	1640	Only Muse Spark 1.3 measured
SciCode	4.6%	Not measured	Only Claude Opus 4.1 measured
Neither model has a result on the other 16 boards here

IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02

Intelligence benchmarks for Claude Opus 4.1 and Muse Spark 1.3
Benchmark	Claude Opus 4.1	Muse Spark 1.3	Leader
AA Intelligence Index	22.8	48.1	Muse Spark 1.3
Epoch Capabilities Index	144.1	157.2	Muse Spark 1.3

Agentic workDirectional onlyPublic boards, shown as published, kept out of the index19 boards, none shared

Agentic work benchmarks for Claude Opus 4.1 and Muse Spark 1.3
Benchmark	Claude Opus 4.1	Muse Spark 1.3	Leader
AA Agentic Index	Not measured	55.5	Only Muse Spark 1.3 measured
Design Arena: agents building web apps	Not measured	1297	Only Muse Spark 1.3 measured
Design Arena: agents building full-stack apps	Not measured	1295	Only Muse Spark 1.3 measured
Design Arena: agents building mobile apps	Not measured	1218	Only Muse Spark 1.3 measured
Design Arena: agents building Godot games	Not measured	1241	Only Muse Spark 1.3 measured
Design Arena: PowerPoint slides	Not measured	1219	Only Muse Spark 1.3 measured
Design Arena: spreadsheets	Not measured	1062	Only Muse Spark 1.3 measured
LiveBench research	Not measured	68.6%	Only Muse Spark 1.3 measured
LiveBench browser	Not measured	80.0%	Only Muse Spark 1.3 measured
LiveBench long agentic	Not measured	40.4%	Only Muse Spark 1.3 measured
Finance Agent (Vals AI)	Not measured	58.9%	Only Muse Spark 1.3 measured
Tax Agent Bench (Vals AI)	Not measured	36.0%	Only Muse Spark 1.3 measured
Legal Research Bench (Vals AI)	Not measured	40.9%	Only Muse Spark 1.3 measured
Excel Modeling Benchmark (Vals AI)	Not measured	62.7%	Only Muse Spark 1.3 measured
Terminal-Bench-Science (Vals AI)	Not measured	4.3%	Only Muse Spark 1.3 measured
APEX-Agents	Not measured	58.6%	Only Muse Spark 1.3 measured
METR time horizons	66.8%	Not measured	Only Claude Opus 4.1 measured
GDPval	43.6%	Not measured	Only Claude Opus 4.1 measured
DeepResearch Bench	48.3%	Not measured	Only Claude Opus 4.1 measured
Neither model has a result on the other 22 boards here

ReasoningLike-for-likePublic boards, shown as published, kept out of the index04

Reasoning benchmarks for Claude Opus 4.1 and Muse Spark 1.3
Benchmark	Claude Opus 4.1	Muse Spark 1.3	Leader
GPQA Diamond	76.3%	Not measured	Only Claude Opus 4.1 measured
LiveBench reasoning	Not measured	89.7%	Only Muse Spark 1.3 measured
MMMU Pro (Vals AI)	77.5%	Not measured	Only Claude Opus 4.1 measured
GPQA Diamond (Artificial Analysis run)	Not measured	94.1%	Only Muse Spark 1.3 measured
Humanity's Last Exam (Artificial Analysis run)	Not measured	48.7%	Only Muse Spark 1.3 measured
GPQA Diamond (Epoch AI run)	77.3%	Not measured	Only Claude Opus 4.1 measured
SimpleBench	60.0%	Not measured	Only Claude Opus 4.1 measured
Chess puzzles	Not measured	37.0%	Only Muse Spark 1.3 measured
Mystery game puzzles	21.0%	25.0%	Muse Spark 1.3
EBR-bench	7.9%	Not measured	Only Claude Opus 4.1 measured
VPCT	35.0%	Not measured	Only Claude Opus 4.1 measured
LMArena Text: hard prompts	1442	1503	Muse Spark 1.3
LMArena Text: expert	1438	1519	Muse Spark 1.3
LMArena Text: hard prompts in English	1451	1500	Muse Spark 1.3
LMArena Vision: diagrams	Not measured	1330	Only Muse Spark 1.3 measured
LMArena Vision: homework	Not measured	1296	Only Muse Spark 1.3 measured
Neither model has a result on the other 6 boards here

MathLike-for-likePublic boards, shown as published, kept out of the index05

Math benchmarks for Claude Opus 4.1 and Muse Spark 1.3
Benchmark	Claude Opus 4.1	Muse Spark 1.3	Leader
AIME	78.2%	Not measured	Only Claude Opus 4.1 measured
MATH 500 (Vals AI)	95.4%	Not measured	Only Claude Opus 4.1 measured
MGSM (Vals AI)	94.4%	Not measured	Only Claude Opus 4.1 measured
OTIS Mock AIME	68.9%	99.2%	Muse Spark 1.3
FrontierMath, tiers 1 to 3	12.6%	74.4%	Muse Spark 1.3
FrontierMath, tier 4	2.4%	46.3%	Muse Spark 1.3
ProofBench	Not measured	58.0%	Only Muse Spark 1.3 measured
LMArena Text: math	1431	1497	Muse Spark 1.3
LMArena Text: mathematical work	1434	1491	Muse Spark 1.3
Neither model has a result on the other 4 boards here

KnowledgeLike-for-likePublic boards, shown as published, kept out of the index04

Knowledge benchmarks for Claude Opus 4.1 and Muse Spark 1.3
Benchmark	Claude Opus 4.1	Muse Spark 1.3	Leader
MMLU Pro	87.9%	Not measured	Only Claude Opus 4.1 measured
LegalBench (Vals AI)	83.5%	Not measured	Only Claude Opus 4.1 measured
TaxEval (Vals AI)	73.7%	Not measured	Only Claude Opus 4.1 measured
MortgageTax (Vals AI)	61.1%	Not measured	Only Claude Opus 4.1 measured
MedQA (Vals AI)	93.6%	Not measured	Only Claude Opus 4.1 measured
MedCode (Vals AI)	47.2%	Not measured	Only Claude Opus 4.1 measured
LMArena Text: science	1422	1507	Muse Spark 1.3
LMArena Text: medicine and healthcare	1416	1493	Muse Spark 1.3
LMArena Text: legal and government	1421	1499	Muse Spark 1.3
LMArena Text: business and finance	1406	1490	Muse Spark 1.3
FACTS Benchmark Suite	40.4%	Not measured	Only Claude Opus 4.1 measured
Neither model has a result on the other 7 boards here

Web designLike-for-likePublic boards, shown as published, kept out of the index08

Web design benchmarks for Claude Opus 4.1 and Muse Spark 1.3
Benchmark	Claude Opus 4.1	Muse Spark 1.3	Leader
Design Arena: websites	1176	1356	Muse Spark 1.3
Design Arena: UI components	1162	1349	Muse Spark 1.3
Design Arena: game dev	1171	1328	Muse Spark 1.3
Design Arena: data viz	1166	1343	Muse Spark 1.3
Design Arena: 3D	1152	1358	Muse Spark 1.3
Design Arena: all code categories	1170	1352	Muse Spark 1.3
Design Arena: SVG	1152	1301	Muse Spark 1.3
Design Arena: ASCII art	1167	1278	Muse Spark 1.3
LiveBench design	Not measured	74.8%	Only Muse Spark 1.3 measured

GeneralLike-for-likePublic boards, shown as published, kept out of the index019

General benchmarks for Claude Opus 4.1 and Muse Spark 1.3
Benchmark	Claude Opus 4.1	Muse Spark 1.3	Leader
LiveBench data analysis	Not measured	79.6%	Only Muse Spark 1.3 measured
SAGE (Vals AI)	31.4%	Not measured	Only Claude Opus 4.1 measured
MedScribe (Vals AI)	73.9%	Not measured	Only Claude Opus 4.1 measured
Long context reasoning (AA-LCR)	Not measured	83.0%	Only Muse Spark 1.3 measured
DTBench	80.0%	96.5%	Muse Spark 1.3
LMCA	37.1%	53.9%	Muse Spark 1.3
Creative writing (Lech Mazur)	84.7%	Not measured	Only Claude Opus 4.1 measured
LMArena Text	1419	1490	Muse Spark 1.3
LMArena Text: instruction following	1435	1479	Muse Spark 1.3
LMArena Text: creative writing	1412	1462	Muse Spark 1.3
LMArena Vision	Not measured	1308	Only Muse Spark 1.3 measured
LMArena Text: English	1433	1495	Muse Spark 1.3
LMArena Text: non-English	1405	1481	Muse Spark 1.3
LMArena Text: Chinese	1427	1532	Muse Spark 1.3
LMArena Text: German	1413	1513	Muse Spark 1.3
LMArena Text: Japanese	1377	1470	Muse Spark 1.3
LMArena Text: Korean	1381	1490	Muse Spark 1.3
LMArena Text: French	1433	1511	Muse Spark 1.3
LMArena Text: Spanish	1448	1496	Muse Spark 1.3
LMArena Text: Russian	1422	1491	Muse Spark 1.3
LMArena Text: Polish	1413	1490	Muse Spark 1.3
LMArena Text: multi-turn	1444	1487	Muse Spark 1.3
LMArena Text: longer queries	1455	1488	Muse Spark 1.3
LMArena Text: writing and language	1418	1470	Muse Spark 1.3
LMArena Text: entertainment and media	1398	1457	Muse Spark 1.3
LMArena Vision: English	Not measured	1298	Only Muse Spark 1.3 measured
LMArena Vision: Chinese	Not measured	1384	Only Muse Spark 1.3 measured
LMArena Vision: reading text	Not measured	1319	Only Muse Spark 1.3 measured
LMArena Vision: humor	Not measured	1293	Only Muse Spark 1.3 measured
LMArena Vision: creative writing	Not measured	1296	Only Muse Spark 1.3 measured
Neither model has a result on the other 16 boards here

Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared

Image generation benchmarks for Claude Opus 4.1 and Muse Spark 1.3
Benchmark	Claude Opus 4.1	Muse Spark 1.3	Leader
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 4.1$0.052Fits 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 4.1$0.975Fits 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 4.1$3.75Exceeds the context window

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 4.1 and Muse Spark 1.3
Specification	Anthropic Claude Opus 4.1	Meta Muse Spark 1.3
Maker	Anthropic	Meta
Weights	No public weights listed	No public weights listed
Released	August 5, 2025	September 2, 2026
Context window	200K	1.05M
Input $/Mtok	$15.00	$1.25
Output $/Mtok	$75.00	$4.25
Coding index	Not benchmarked	57.4
Independent measurements behind it	1	4
Cost per solved task	Not computable	Not computable
Source	OpenRouter listing	OpenRouter listing

Questions

Is Claude Opus 4.1 better than Muse Spark 1.3 for coding?

Only Muse Spark 1.3 has a coding score, 57.4 on the Vibe Coding Index; Claude Opus 4.1 has none, so the two cannot be ranked on coding. Compare them on price, context and the boards below.

Which is cheaper, Claude Opus 4.1 or Muse Spark 1.3?

Claude Opus 4.1 costs $15.00 per million input tokens and $75.00 per million output tokens; Muse Spark 1.3 costs $1.25 and $4.25. Cost per solved task is known for neither of them.

Which has the bigger context window, Claude Opus 4.1 or Muse Spark 1.3?

Muse Spark 1.3, with 1.05M tokens against 200K.

How many benchmarks is the Claude Opus 4.1 vs Muse Spark 1.3 comparison based on?

46 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.1's coding index rests on 1 independent benchmark and Muse Spark 1.3's on 4. Where only one model has a result, the page says so instead of naming a winner.

Claude Opus 4.1 or Muse Spark 1.3: which to pick

Which one for your work

Coding

Intelligence

Agentic work

Reasoning

Math

Knowledge

Web design

Long documents

Everyday cost

At a glance

Benchmark by benchmark

What each workload costs

Chat turn

Repository review

Agent loop

Specification differences

Questions

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