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Claude Fable 5.1 vs Muse Spark 1.3

Updated October 21, 2026. 92 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 1.3
Claude Fable 5.1Anthropic
Coding
89.1
Overall
53.4
Output $/M
$50.00
86
Muse Spark 1.3Meta
Coding
79.7
Overall
48.1
Output $/M
$4.25
6
vs boards won of 92 shared

Decision reading

Pick Claude Fable 5.1 for coding: it scores 89.1 on the Vibe Coding Index against 79.7 for Muse Spark 1.3.

Pick Muse Spark 1.3 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 1.3Meta79.7/1002 independent benchmarksNo cost per solved task
Shared results
92
Claude Fable 5.1 only
32
Muse Spark 1.3 only
0
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 1.3 79.7 from 2 benchmarks.
Widest category
Math, 19.0 points apart on average over 6 shared benchmarks.
Widest single gap
Terminal-Bench 4 (Vals AI): Claude Fable 5.1 58.1% against Muse Spark 1.3 10.6%, 47.5 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $50.00 against Muse Spark 1.3 $4.25 per million output tokens, 11.8x apart.
Context window
Claude Fable 5.1 takes 1M 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
CategoryClaude Fable 5.1BarsMuse Spark 1.3Ties
Coding180
Intelligence20
Agentic work151
Reasoning91
Math60
Knowledge40
Web design63
General261
All shared boards866
CodingLike-for-likeFour of these boards feed the Vibe Coding Index180
Coding benchmarks for Claude Fable 5.1 and Muse Spark 1.3
BenchmarkClaude Fable 5.1Muse Spark 1.3Leader
LiveBench coding97.7%90.2%Claude Fable 5.1
LMArena WebDev17431659Claude Fable 5.1
AA Coding Index81.675.8Claude Fable 5.1
LiveCodeBench (Vals AI)90.5%Not measuredOnly Claude Fable 5.1 measured
Terminal-Bench 4 (Vals AI)58.1%10.6%Claude Fable 5.1
Vibe Code Bench (Vals AI)90.3%82.9%Claude Fable 5.1
Code migration (Vals AI)54.6%27.6%Claude Fable 5.1
ProgramBench (Vals AI)7.0%0.5%Claude Fable 5.1
IOI (Vals AI)90.8%43.9%Claude Fable 5.1
Terminal-Bench 2.1 (Vals AI)85.0%72.3%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%Not measuredOnly Claude Fable 5.1 measured
CyberBench (Vals AI)70.4%69.4%Claude Fable 5.1
SciCode63.1%59.7%Claude Fable 5.1
FrontierCode50.9%Not measuredOnly Claude Fable 5.1 measured
FrontierSWE56.3%25.8%Claude Fable 5.1
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-Bench2143.21688.3Claude Fable 5.1
LMArena Text: coding15321510Claude Fable 5.1
LMArena Text: software and IT15301511Claude Fable 5.1
LMArena WebDev: React17921672Claude Fable 5.1
LMArena WebDev: HTML16841653Claude Fable 5.1
LMArena WebDev: from an image17221640Claude Fable 5.1
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5.1 and Muse Spark 1.3
BenchmarkClaude Fable 5.1Muse Spark 1.3Leader
AA Intelligence Index53.448.1Claude Fable 5.1
Epoch Capabilities Index166.5157.2Claude Fable 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index151
Agentic work benchmarks for Claude Fable 5.1 and Muse Spark 1.3
BenchmarkClaude Fable 5.1Muse Spark 1.3Leader
AA Agentic Index57.955.5Claude Fable 5.1
Design Arena: agents building web apps13181297Claude Fable 5.1
Design Arena: agents building full-stack apps13261295Claude Fable 5.1
Design Arena: agents building mobile apps12671217Claude Fable 5.1
Design Arena: agents building Godot games13271241Claude Fable 5.1
Design Arena: PowerPoint slides13281244Claude Fable 5.1
Design Arena: spreadsheets13741048Claude Fable 5.1
LiveBench research82.0%68.6%Claude Fable 5.1
LiveBench browser100.0%80.0%Claude Fable 5.1
LiveBench long agentic80.8%40.4%Claude Fable 5.1
SREBench (Vals AI)22.9%Not measuredOnly Claude Fable 5.1 measured
Finance Agent (Vals AI)58.9%58.9%Muse Spark 1.3
Tax Agent Bench (Vals AI)49.2%36.0%Claude Fable 5.1
Legal Research Bench (Vals AI)55.3%40.9%Claude Fable 5.1
Excel Modeling Benchmark (Vals AI)76.7%62.7%Claude Fable 5.1
Terminal-Bench-Science (Vals AI)40.0%4.3%Claude Fable 5.1
Time Horizon Index (Vals AI)63.3%Not measuredOnly Claude Fable 5.1 measured
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%58.6%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$5,422Not measuredOnly Claude Fable 5.1 measured
LMArena Search1246Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 15 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index91
Reasoning benchmarks for Claude Fable 5.1 and Muse Spark 1.3
BenchmarkClaude Fable 5.1Muse Spark 1.3Leader
GPQA Diamond93.4%Not measuredOnly Claude Fable 5.1 measured
LiveBench reasoning91.7%89.7%Claude Fable 5.1
MysteryMechanism (Vals AI)47.8%Not measuredOnly Claude Fable 5.1 measured
MMMU Pro (Vals AI)90.6%Not measuredOnly Claude Fable 5.1 measured
GPQA Diamond (Artificial Analysis run)93.7%94.1%Muse Spark 1.3
Humanity's Last Exam (Artificial Analysis run)59.1%48.7%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%37.0%Claude Fable 5.1
Mystery game puzzles58.0%25.0%Claude Fable 5.1
EBR-bench57.1%Not measuredOnly Claude Fable 5.1 measured
LMArena Text: hard prompts15281503Claude Fable 5.1
LMArena Text: expert15441519Claude Fable 5.1
LMArena Text: hard prompts in English15221500Claude Fable 5.1
LMArena Vision: diagrams13431330Claude Fable 5.1
LMArena Vision: homework13451296Claude 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 index60
Math benchmarks for Claude Fable 5.1 and Muse Spark 1.3
BenchmarkClaude Fable 5.1Muse Spark 1.3Leader
OTIS Mock AIME100.0%99.2%Claude Fable 5.1
FrontierMath, tiers 1 to 390.2%74.4%Claude Fable 5.1
FrontierMath, tier 487.8%46.3%Claude Fable 5.1
ProofBench100.0%58.0%Claude Fable 5.1
LMArena Text: math15311497Claude Fable 5.1
LMArena Text: mathematical work15411491Claude 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 index40
Knowledge benchmarks for Claude Fable 5.1 and Muse Spark 1.3
BenchmarkClaude Fable 5.1Muse Spark 1.3Leader
MMLU Pro92.4%Not measuredOnly Claude Fable 5.1 measured
LegalBench (Vals AI)88.5%Not measuredOnly Claude Fable 5.1 measured
TaxEval (Vals AI)76.0%Not measuredOnly Claude Fable 5.1 measured
MortgageTax (Vals AI)70.8%Not measuredOnly Claude Fable 5.1 measured
MedCode (Vals AI)53.5%Not measuredOnly Claude Fable 5.1 measured
SimpleQA Verified70.8%Not measuredOnly Claude Fable 5.1 measured
LMArena Text: science15321507Claude Fable 5.1
LMArena Text: medicine and healthcare15311493Claude Fable 5.1
LMArena Text: legal and government15141499Claude Fable 5.1
LMArena Text: business and finance14931490Claude Fable 5.1
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index63
Web design benchmarks for Claude Fable 5.1 and Muse Spark 1.3
BenchmarkClaude Fable 5.1Muse Spark 1.3Leader
Design Arena: websites13131356Muse Spark 1.3
Design Arena: UI components13381352Muse Spark 1.3
Design Arena: game dev13821329Claude Fable 5.1
Design Arena: data viz13441343Claude Fable 5.1
Design Arena: 3D13931359Claude Fable 5.1
Design Arena: all code categories13361353Muse Spark 1.3
Design Arena: SVG13011300Claude Fable 5.1
Design Arena: ASCII art13241280Claude Fable 5.1
LiveBench design83.4%74.8%Claude Fable 5.1
GeneralLike-for-likePublic boards, shown as published, kept out of the index261
General benchmarks for Claude Fable 5.1 and Muse Spark 1.3
BenchmarkClaude Fable 5.1Muse Spark 1.3Leader
LiveBench data analysis80.3%79.6%Claude Fable 5.1
Public Benefits Bench (Vals AI)74.9%Not measuredOnly Claude Fable 5.1 measured
SAGE (Vals AI)48.5%Not measuredOnly Claude Fable 5.1 measured
MedScribe (Vals AI)91.3%Not measuredOnly Claude Fable 5.1 measured
Long context reasoning (AA-LCR)85.3%83.0%Claude Fable 5.1
DTBench97.6%96.5%Claude Fable 5.1
LMCA65.5%53.9%Claude Fable 5.1
Furniture assembly70.0%Not measuredOnly Claude Fable 5.1 measured
LMArena Text15121490Claude Fable 5.1
LMArena Text: instruction following15181479Claude Fable 5.1
LMArena Text: creative writing15091462Claude Fable 5.1
LMArena Vision13191308Claude Fable 5.1
LMArena Text: English15061495Claude Fable 5.1
LMArena Text: non-English15081481Claude Fable 5.1
LMArena Text: Chinese15841532Claude Fable 5.1
LMArena Text: German14991513Muse Spark 1.3
LMArena Text: Japanese15621470Claude Fable 5.1
LMArena Text: Korean15171490Claude Fable 5.1
LMArena Text: French15231511Claude Fable 5.1
LMArena Text: Spanish15201496Claude Fable 5.1
LMArena Text: Russian15201491Claude Fable 5.1
LMArena Text: Polish15251490Claude Fable 5.1
LMArena Text: multi-turn14931487Claude Fable 5.1
LMArena Text: longer queries15241488Claude Fable 5.1
LMArena Text: writing and language15101470Claude Fable 5.1
LMArena Text: entertainment and media14971457Claude Fable 5.1
LMArena Vision: English13131298Claude Fable 5.1
LMArena Vision: Chinese13911384Claude Fable 5.1
LMArena Vision: reading text13271319Claude Fable 5.1
LMArena Vision: humor13181293Claude Fable 5.1
LMArena Vision: creative writing13301296Claude Fable 5.1
Neither model has a result on the other 15 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 1.3
BenchmarkClaude Fable 5.1Muse Spark 1.3Leader
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 1.3$0.0034Fits in one request

Muse Spark 1.3 costs less

Repository review

50K input + 3K output tokens

Claude Fable 5.1$0.650Fits 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 Fable 5.1$2.50Fits in one request
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 Fable 5.1 and Muse Spark 1.3
SpecificationAnthropic Claude Fable 5.1Meta Muse Spark 1.3
MakerAnthropicMeta
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 1, 2026September 2, 2026
Context window1M1.05M
Input $/Mtok$10.00$1.25
Output $/Mtok$50.00$4.25
Coding index89.179.7
Independent measurements behind it22
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than Muse Spark 1.3 for coding?

Pick Claude Fable 5.1 for coding: it scores 89.1 on the Vibe Coding Index against 79.7 for Muse Spark 1.3. Pick Muse Spark 1.3 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 1.3?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 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 Fable 5.1 or Muse Spark 1.3?

Muse Spark 1.3, with 1.05M tokens against 1M.

How many benchmarks is the Claude Fable 5.1 vs Muse Spark 1.3 comparison based on?

92 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 1.3's on 2. Where only one model has a result, the page says so instead of naming a winner.

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