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Claude Fable 5.1 vs Muse Spark 1.1

Updated October 21, 2026. 88 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Fable 5.1 Replace Muse Spark 1.1
Claude Fable 5.1Anthropic
Coding
89.1
Overall
53.4
Output $/M
$50.00
86
Muse Spark 1.1Meta
Coding
48.9
Overall
33.7
Output $/M
$4.25
2
vs boards won of 88 shared

Decision reading

Pick Claude Fable 5.1 for coding: it scores 89.1 on the Vibe Coding Index against 48.9 for Muse Spark 1.1.

Pick Muse Spark 1.1 when output tokens cost 11.8x less, or when the context window is larger, 1.05M against 1M tokens.

Model AClaude Fable 5.1Anthropic89.1/1002 independent benchmarksNo cost per solved taskModel BMuse Spark 1.1Meta48.9/1001 independent benchmark$0.43 per solved task
Shared results
88
Claude Fable 5.1 only
36
Muse Spark 1.1 only
8
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 Fable 5.1 89.1 from 2 benchmarks, Muse Spark 1.1 48.9 from 1 benchmark.
Widest category
Math, 26.0 points apart on average over 3 shared benchmarks.
Widest single gap
Time Horizon Index (Vals AI): Claude Fable 5.1 63.3% against Muse Spark 1.1 1.7%, 61.7 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $50.00 against Muse Spark 1.1 $4.25 per million output tokens, 11.8x apart.
Context window
Claude Fable 5.1 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 Fable 5.1BarsMuse Spark 1.1Ties
Coding140
Intelligence20
Agentic work121
Reasoning100
Math30
Knowledge81
Web design80
General290
All shared boards862
CodingLike-for-likeFour of these boards feed the Vibe Coding Index140
Coding benchmarks for Claude Fable 5.1 and Muse Spark 1.1
BenchmarkClaude Fable 5.1Muse Spark 1.1Leader
LiveBench coding97.7%Not measuredOnly Claude Fable 5.1 measured
LMArena WebDev17431542Claude Fable 5.1
AA Coding Index81.671.3Claude Fable 5.1
LiveCodeBench (Vals AI)90.5%85.9%Claude Fable 5.1
SWE-bench Verified (Vals AI)Not measured82.0%Only Muse Spark 1.1 measured
Terminal-Bench 4 (Vals AI)58.1%Not measuredOnly Claude Fable 5.1 measured
Vibe Code Bench (Vals AI)90.3%72.2%Claude Fable 5.1
Code migration (Vals AI)54.6%31.1%Claude Fable 5.1
ProgramBench (Vals AI)7.0%0.0%Claude Fable 5.1
IOI (Vals AI)90.8%Not measuredOnly Claude Fable 5.1 measured
Terminal-Bench 2.1 (Vals AI)85.0%69.3%Claude Fable 5.1
SWE-bench Multimodal (Vals AI)61.3%Not measuredOnly Claude Fable 5.1 measured
Vibe Code Bench 1-100 (Vals AI)28.0%Not measuredOnly Claude Fable 5.1 measured
SkillsBench (Vals AI)61.5%59.2%Claude Fable 5.1
CyberBench (Vals AI)70.4%Not measuredOnly Claude Fable 5.1 measured
SciCode63.1%58.8%Claude Fable 5.1
FrontierCode50.9%Not measuredOnly Claude Fable 5.1 measured
FrontierSWE56.3%Not measuredOnly Claude Fable 5.1 measured
GSO-Bench88.2%Not measuredOnly Claude Fable 5.1 measured
WeirdML92.9%Not measuredOnly Claude Fable 5.1 measured
MirrorCode73.3%Not measuredOnly Claude Fable 5.1 measured
ALE-Bench2143.2Not measuredOnly Claude Fable 5.1 measured
LMArena Text: coding15321498Claude Fable 5.1
LMArena Text: software and IT15301498Claude Fable 5.1
LMArena WebDev: React17921532Claude Fable 5.1
LMArena WebDev: HTML16841540Claude Fable 5.1
LMArena WebDev: from an image17221540Claude Fable 5.1
Neither model has a result on the other 11 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5.1 and Muse Spark 1.1
BenchmarkClaude Fable 5.1Muse Spark 1.1Leader
AA Intelligence Index53.433.7Claude Fable 5.1
Epoch Capabilities Index166.5154.1Claude Fable 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index121
Agentic work benchmarks for Claude Fable 5.1 and Muse Spark 1.1
BenchmarkClaude Fable 5.1Muse Spark 1.1Leader
AA Agentic Index57.925.8Claude Fable 5.1
Design Arena: agents building web apps13181207Claude Fable 5.1
Design Arena: agents building full-stack apps13261199Claude Fable 5.1
Design Arena: agents building mobile apps12671177Claude Fable 5.1
Design Arena: agents building Android appsNot measured1184Only Muse Spark 1.1 measured
Design Arena: agents building Godot games13271103Claude Fable 5.1
Design Arena: agents building gamesNot measured1183Only Muse Spark 1.1 measured
Design Arena: HTML slidesNot measured1194Only Muse Spark 1.1 measured
Design Arena: PowerPoint slides13281156Claude Fable 5.1
Design Arena: spreadsheets1374974Claude Fable 5.1
LiveBench research82.0%Not measuredOnly Claude Fable 5.1 measured
LiveBench browser100.0%Not measuredOnly Claude Fable 5.1 measured
LiveBench long agentic80.8%Not measuredOnly Claude Fable 5.1 measured
SREBench (Vals AI)22.9%Not measuredOnly Claude Fable 5.1 measured
Finance Agent (Vals AI)58.9%57.2%Claude Fable 5.1
Tax Agent Bench (Vals AI)49.2%Not measuredOnly Claude Fable 5.1 measured
Legal Research Bench (Vals AI)55.3%38.0%Claude Fable 5.1
Excel Modeling Benchmark (Vals AI)76.7%56.4%Claude Fable 5.1
Terminal-Bench-Science (Vals AI)40.0%Not measuredOnly Claude Fable 5.1 measured
Time Horizon Index (Vals AI)63.3%1.7%Claude Fable 5.1
CUA-bench (Vals AI)13.2%Not measuredOnly Claude Fable 5.1 measured
Robo-bench (Vals AI)5.8%Not measuredOnly Claude Fable 5.1 measured
APEX-Agents68.6%31.8%Claude Fable 5.1
Remote Labor Index17.9%Not measuredOnly Claude Fable 5.1 measured
SpireClimb2.0%Not measuredOnly Claude Fable 5.1 measured
Vending-Bench 2$5,422$6,520Muse Spark 1.1
LMArena Search1246Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 12 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index100
Reasoning benchmarks for Claude Fable 5.1 and Muse Spark 1.1
BenchmarkClaude Fable 5.1Muse Spark 1.1Leader
GPQA Diamond93.4%91.2%Claude Fable 5.1
LiveBench reasoning91.7%Not measuredOnly Claude Fable 5.1 measured
MysteryMechanism (Vals AI)47.8%Not measuredOnly Claude Fable 5.1 measured
MMMU Pro (Vals AI)90.6%86.6%Claude Fable 5.1
GPQA Diamond (Artificial Analysis run)93.7%89.8%Claude Fable 5.1
Humanity's Last Exam (Artificial Analysis run)59.1%46.2%Claude Fable 5.1
ARC-AGI97.5%Not measuredOnly Claude Fable 5.1 measured
ARC-AGI-290.0%Not measuredOnly Claude Fable 5.1 measured
Chess puzzles48.0%34.0%Claude Fable 5.1
Mystery game puzzles58.0%Not measuredOnly Claude Fable 5.1 measured
EBR-bench57.1%Not measuredOnly Claude Fable 5.1 measured
LMArena Text: hard prompts15281485Claude Fable 5.1
LMArena Text: expert15441478Claude Fable 5.1
LMArena Text: hard prompts in English15221480Claude Fable 5.1
LMArena Vision: diagrams13431305Claude Fable 5.1
LMArena Vision: homework13451287Claude Fable 5.1
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for Claude Fable 5.1 and Muse Spark 1.1
BenchmarkClaude Fable 5.1Muse Spark 1.1Leader
OTIS Mock AIME100.0%Not measuredOnly Claude Fable 5.1 measured
FrontierMath, tiers 1 to 390.2%Not measuredOnly Claude Fable 5.1 measured
FrontierMath, tier 487.8%Not measuredOnly Claude Fable 5.1 measured
ProofBench100.0%39.0%Claude Fable 5.1
LMArena Text: math15311482Claude Fable 5.1
LMArena Text: mathematical work15411487Claude Fable 5.1
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index81
Knowledge benchmarks for Claude Fable 5.1 and Muse Spark 1.1
BenchmarkClaude Fable 5.1Muse Spark 1.1Leader
MMLU Pro92.4%88.7%Claude Fable 5.1
LegalBench (Vals AI)88.5%85.0%Claude Fable 5.1
CorpFin (Vals AI)Not measured71.3%Only Muse Spark 1.1 measured
TaxEval (Vals AI)76.0%79.7%Muse Spark 1.1
MortgageTax (Vals AI)70.8%66.1%Claude Fable 5.1
MedCode (Vals AI)53.5%Not measuredOnly Claude Fable 5.1 measured
SimpleQA Verified70.8%57.8%Claude Fable 5.1
LMArena Text: science15321484Claude Fable 5.1
LMArena Text: medicine and healthcare15311479Claude Fable 5.1
LMArena Text: legal and government15141481Claude Fable 5.1
LMArena Text: business and finance14931470Claude Fable 5.1
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Fable 5.1 and Muse Spark 1.1
BenchmarkClaude Fable 5.1Muse Spark 1.1Leader
Design Arena: websites13131270Claude Fable 5.1
Design Arena: UI components13381290Claude Fable 5.1
Design Arena: game dev13821269Claude Fable 5.1
Design Arena: data viz13441268Claude Fable 5.1
Design Arena: 3D13931260Claude Fable 5.1
Design Arena: all code categories13361276Claude Fable 5.1
Design Arena: SVG13011234Claude Fable 5.1
Design Arena: ASCII art13241270Claude Fable 5.1
LiveBench design83.4%Not measuredOnly Claude Fable 5.1 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index290
General benchmarks for Claude Fable 5.1 and Muse Spark 1.1
BenchmarkClaude Fable 5.1Muse Spark 1.1Leader
LiveBench data analysis80.3%Not measuredOnly Claude Fable 5.1 measured
Public Benefits Bench (Vals AI)74.9%61.3%Claude Fable 5.1
SAGE (Vals AI)48.5%45.6%Claude Fable 5.1
MedScribe (Vals AI)91.3%88.9%Claude Fable 5.1
Vals Multimodal IndexNot measured66.7%Only Muse Spark 1.1 measured
Long context reasoning (AA-LCR)85.3%77.7%Claude Fable 5.1
DTBench97.6%94.4%Claude Fable 5.1
LMCA65.5%49.9%Claude Fable 5.1
Surface Evolver BenchNot measured52.5%Only Muse Spark 1.1 measured
Furniture assembly70.0%Not measuredOnly Claude Fable 5.1 measured
LMArena Text15121478Claude Fable 5.1
LMArena Text: instruction following15181457Claude Fable 5.1
LMArena Text: creative writing15091435Claude Fable 5.1
LMArena Vision13191293Claude Fable 5.1
LMArena Text: English15061478Claude Fable 5.1
LMArena Text: non-English15081471Claude Fable 5.1
LMArena Text: Chinese15841515Claude Fable 5.1
LMArena Text: German14991469Claude Fable 5.1
LMArena Text: Japanese15621450Claude Fable 5.1
LMArena Text: Korean15171459Claude Fable 5.1
LMArena Text: French15231492Claude Fable 5.1
LMArena Text: Spanish15201464Claude Fable 5.1
LMArena Text: Russian15201482Claude Fable 5.1
LMArena Text: Polish15251499Claude Fable 5.1
LMArena Text: multi-turn14931484Claude Fable 5.1
LMArena Text: longer queries15241462Claude Fable 5.1
LMArena Text: writing and language15101448Claude Fable 5.1
LMArena Text: entertainment and media14971438Claude Fable 5.1
LMArena Vision: English13131292Claude Fable 5.1
LMArena Vision: Chinese13911348Claude Fable 5.1
LMArena Vision: reading text13271301Claude Fable 5.1
LMArena Vision: humor13181288Claude Fable 5.1
LMArena Vision: creative writing13301253Claude Fable 5.1
LMArena DocumentNot measured1465Only Muse Spark 1.1 measured
Neither model has a result on the other 12 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Fable 5.1 and Muse Spark 1.1
BenchmarkClaude Fable 5.1Muse 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 Fable 5.1$0.035Fits 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 Fable 5.1$0.650Fits 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 Fable 5.1$2.50Fits 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 Fable 5.1 and Muse Spark 1.1
SpecificationAnthropic Claude Fable 5.1Meta Muse Spark 1.1
MakerAnthropicMeta
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 1, 2026July 16, 2026
Context window1M1.05M
Input $/Mtok$10.00$1.25
Output $/Mtok$50.00$4.25
Coding index89.148.9
Independent measurements behind it21
Cost per solved taskNot computable$0.43
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than Muse Spark 1.1 for coding?

Pick Claude Fable 5.1 for coding: it scores 89.1 on the Vibe Coding Index against 48.9 for Muse Spark 1.1. Pick Muse Spark 1.1 when output tokens cost 11.8x less, or when the context window is larger, 1.05M against 1M tokens.

Which is cheaper, Claude Fable 5.1 or Muse Spark 1.1?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; Muse Spark 1.1 costs $1.25 and $4.25. Cost per solved task is known for Muse Spark 1.1 only.

Which has the bigger context window, Claude Fable 5.1 or Muse Spark 1.1?

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

How many benchmarks is the Claude Fable 5.1 vs Muse Spark 1.1 comparison based on?

88 benchmarks have a result for both models as of October 21, 2026. Claude Fable 5.1'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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