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Claude Fable 5.1 vs Muse Spark 1.2

Updated October 21, 2026. 89 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 1.2
Claude Fable 5.1Anthropic
Coding
89.1
Overall
53.4
Output $/M
$50.00
84
Muse Spark 1.2Meta
Coding
65.1
Overall
39.6
Output $/M
$4.25
4
vs boards won of 89 shared, 1 tied

Decision reading

Pick Claude Fable 5.1 for coding: it scores 89.1 on the Vibe Coding Index against 65.1 for Muse Spark 1.2.

Pick Muse Spark 1.2 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 1.2Meta65.1/1002 independent benchmarks$0.64 per solved task
Shared results
89
Claude Fable 5.1 only
35
Muse Spark 1.2 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 1.2 65.1 from 2 benchmarks.
Widest category
Math, 25.0 points apart on average over 3 shared benchmarks.
Widest single gap
IOI (Vals AI): Claude Fable 5.1 90.8% against Muse Spark 1.2 21.8%, 69.0 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $50.00 against Muse Spark 1.2 $4.25 per million output tokens, 11.8x apart.
Context window
Claude Fable 5.1 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 Fable 5.1BarsMuse Spark 1.2Ties
Coding180
Intelligence20
Agentic work131
Reasoning90
Math30
Knowledge82
Web design801 tie
General231
All shared boards8441 tie
CodingLike-for-likeFour of these boards feed the Vibe Coding Index180
Coding benchmarks for Claude Fable 5.1 and Muse Spark 1.2
BenchmarkClaude Fable 5.1Muse Spark 1.2Leader
LiveBench coding97.7%78.2%Claude Fable 5.1
LMArena WebDev17431534Claude Fable 5.1
AA Coding Index81.672.2Claude Fable 5.1
LiveCodeBench (Vals AI)90.5%Not measuredOnly Claude Fable 5.1 measured
SWE-bench Verified (Vals AI)Not measured86.6%Only Muse Spark 1.2 measured
Terminal-Bench 4 (Vals AI)58.1%6.1%Claude Fable 5.1
Vibe Code Bench (Vals AI)90.3%79.1%Claude Fable 5.1
Code migration (Vals AI)54.6%29.9%Claude Fable 5.1
ProgramBench (Vals AI)7.0%0.5%Claude Fable 5.1
IOI (Vals AI)90.8%21.8%Claude Fable 5.1
Terminal-Bench 2.1 (Vals AI)85.0%69.7%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%53.0%Claude Fable 5.1
CyberBench (Vals AI)70.4%69.5%Claude Fable 5.1
SciCode63.1%57.4%Claude Fable 5.1
FrontierCode50.9%Not measuredOnly Claude Fable 5.1 measured
FrontierSWE56.3%12.0%Claude Fable 5.1
GSO-Bench88.2%Not measuredOnly Claude Fable 5.1 measured
WeirdML92.9%60.3%Claude Fable 5.1
MirrorCode73.3%Not measuredOnly Claude Fable 5.1 measured
ALE-Bench2143.2Not measuredOnly Claude Fable 5.1 measured
LMArena Text: coding15321505Claude Fable 5.1
LMArena Text: software and IT15301505Claude Fable 5.1
LMArena WebDev: React17921526Claude Fable 5.1
LMArena WebDev: HTML16841543Claude Fable 5.1
LMArena WebDev: from an image1722Not measuredOnly Claude Fable 5.1 measured
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 1.2
BenchmarkClaude Fable 5.1Muse Spark 1.2Leader
AA Intelligence Index53.439.6Claude Fable 5.1
Epoch Capabilities Index166.5155.1Claude Fable 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index131
Agentic work benchmarks for Claude Fable 5.1 and Muse Spark 1.2
BenchmarkClaude Fable 5.1Muse Spark 1.2Leader
AA Agentic Index57.943.2Claude Fable 5.1
Design Arena: agents building web apps13181222Claude Fable 5.1
Design Arena: agents building full-stack apps13261210Claude Fable 5.1
Design Arena: agents building mobile apps12671182Claude Fable 5.1
Design Arena: agents building Android appsNot measured1228Only Muse Spark 1.2 measured
Design Arena: agents building Godot games1327Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building gamesNot measured1179Only Muse Spark 1.2 measured
Design Arena: HTML slidesNot measured1135Only Muse Spark 1.2 measured
Design Arena: PowerPoint slides13281198Claude Fable 5.1
Design Arena: spreadsheets1374Not measuredOnly Claude Fable 5.1 measured
LiveBench research82.0%67.7%Claude Fable 5.1
LiveBench browser100.0%36.0%Claude Fable 5.1
LiveBench long agentic80.8%21.3%Claude Fable 5.1
SREBench (Vals AI)22.9%0.0%Claude Fable 5.1
Finance Agent (Vals AI)58.9%60.6%Muse Spark 1.2
Tax Agent Bench (Vals AI)49.2%32.8%Claude Fable 5.1
Legal Research Bench (Vals AI)55.3%43.8%Claude Fable 5.1
Excel Modeling Benchmark (Vals AI)76.7%57.0%Claude Fable 5.1
BioMysteryBench (Vals AI)Not measured64.8%Only Muse Spark 1.2 measured
Terminal-Bench-Science (Vals AI)40.0%Not measuredOnly Claude Fable 5.1 measured
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%45.4%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 11 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index90
Reasoning benchmarks for Claude Fable 5.1 and Muse Spark 1.2
BenchmarkClaude Fable 5.1Muse Spark 1.2Leader
GPQA Diamond93.4%Not measuredOnly Claude Fable 5.1 measured
LiveBench reasoning91.7%90.0%Claude Fable 5.1
MysteryMechanism (Vals AI)47.8%Not measuredOnly Claude Fable 5.1 measured
MMMU Pro (Vals AI)90.6%86.1%Claude Fable 5.1
GPQA Diamond (Artificial Analysis run)93.7%90.4%Claude Fable 5.1
Humanity's Last Exam (Artificial Analysis run)59.1%45.5%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
SimpleBenchNot measured74.5%Only Muse Spark 1.2 measured
Chess puzzles48.0%27.0%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 prompts15281489Claude Fable 5.1
LMArena Text: expert15441475Claude Fable 5.1
LMArena Text: hard prompts in English15221487Claude Fable 5.1
LMArena Vision: diagrams13431317Claude Fable 5.1
LMArena Vision: homework1345Not measuredOnly Claude Fable 5.1 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 Fable 5.1 and Muse Spark 1.2
BenchmarkClaude Fable 5.1Muse Spark 1.2Leader
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%43.0%Claude Fable 5.1
LMArena Text: math15311484Claude Fable 5.1
LMArena Text: mathematical work15411480Claude 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 index82
Knowledge benchmarks for Claude Fable 5.1 and Muse Spark 1.2
BenchmarkClaude Fable 5.1Muse Spark 1.2Leader
MMLU Pro92.4%88.3%Claude Fable 5.1
LegalBench (Vals AI)88.5%85.3%Claude Fable 5.1
CorpFin (Vals AI)Not measured70.9%Only Muse Spark 1.2 measured
TaxEval (Vals AI)76.0%80.4%Muse Spark 1.2
MortgageTax (Vals AI)70.8%65.4%Claude Fable 5.1
MedCode (Vals AI)53.5%49.4%Claude Fable 5.1
SimpleQA Verified70.8%60.3%Claude Fable 5.1
LMArena Text: science15321500Claude Fable 5.1
LMArena Text: medicine and healthcare15311496Claude Fable 5.1
LMArena Text: legal and government15141517Muse Spark 1.2
LMArena Text: business and finance14931484Claude 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 1.2
BenchmarkClaude Fable 5.1Muse Spark 1.2Leader
Design Arena: websites13131313Tie
Design Arena: UI components13381300Claude Fable 5.1
Design Arena: game dev13821302Claude Fable 5.1
Design Arena: data viz13441334Claude Fable 5.1
Design Arena: 3D13931301Claude Fable 5.1
Design Arena: all code categories13361313Claude Fable 5.1
Design Arena: SVG13011285Claude Fable 5.1
Design Arena: ASCII art13241284Claude Fable 5.1
LiveBench design83.4%67.1%Claude Fable 5.1
GeneralLike-for-likePublic boards, shown as published, kept out of the index231
General benchmarks for Claude Fable 5.1 and Muse Spark 1.2
BenchmarkClaude Fable 5.1Muse Spark 1.2Leader
LiveBench data analysis80.3%76.5%Claude Fable 5.1
Public Benefits Bench (Vals AI)74.9%68.5%Claude Fable 5.1
SAGE (Vals AI)48.5%47.7%Claude Fable 5.1
MedScribe (Vals AI)91.3%90.1%Claude Fable 5.1
Vals Multimodal IndexNot measured69.8%Only Muse Spark 1.2 measured
Long context reasoning (AA-LCR)85.3%79.0%Claude Fable 5.1
DTBench97.6%94.7%Claude Fable 5.1
LMCA65.5%48.4%Claude Fable 5.1
Furniture assembly70.0%Not measuredOnly Claude Fable 5.1 measured
LMArena Text15121482Claude Fable 5.1
LMArena Text: instruction following15181462Claude Fable 5.1
LMArena Text: creative writing15091436Claude Fable 5.1
LMArena Vision13191304Claude Fable 5.1
LMArena Text: English15061483Claude Fable 5.1
LMArena Text: non-English15081476Claude Fable 5.1
LMArena Text: Chinese15841509Claude Fable 5.1
LMArena Text: German1499Not measuredOnly Claude Fable 5.1 measured
LMArena Text: Japanese1562Not measuredOnly Claude Fable 5.1 measured
LMArena Text: Korean15171462Claude Fable 5.1
LMArena Text: French15231495Claude Fable 5.1
LMArena Text: Spanish15201484Claude Fable 5.1
LMArena Text: Russian15201483Claude Fable 5.1
LMArena Text: Polish1525Not measuredOnly Claude Fable 5.1 measured
LMArena Text: multi-turn14931502Muse Spark 1.2
LMArena Text: longer queries15241473Claude Fable 5.1
LMArena Text: writing and language15101453Claude Fable 5.1
LMArena Text: entertainment and media14971443Claude Fable 5.1
LMArena Vision: English13131291Claude Fable 5.1
LMArena Vision: Chinese1391Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: reading text13271313Claude Fable 5.1
LMArena Vision: humor1318Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: creative writing1330Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 14 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 1.2
BenchmarkClaude Fable 5.1Muse 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 Fable 5.1$0.035Fits 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 Fable 5.1$0.650Fits 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 Fable 5.1$2.50Fits 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 Fable 5.1 and Muse Spark 1.2
SpecificationAnthropic Claude Fable 5.1Meta Muse Spark 1.2
MakerAnthropicMeta
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 1, 2026August 5, 2026
Context window1M1.05M
Input $/Mtok$10.00$1.25
Output $/Mtok$50.00$4.25
Coding index89.165.1
Independent measurements behind it22
Cost per solved taskNot computable$0.64
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than Muse Spark 1.2 for coding?

Pick Claude Fable 5.1 for coding: it scores 89.1 on the Vibe Coding Index against 65.1 for Muse Spark 1.2. Pick Muse Spark 1.2 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 1.2?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; Muse Spark 1.2 costs $1.25 and $4.25. Cost per solved task is known for Muse Spark 1.2 only.

Which has the bigger context window, Claude Fable 5.1 or Muse Spark 1.2?

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

How many benchmarks is the Claude Fable 5.1 vs Muse Spark 1.2 comparison based on?

89 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 1.2's on 2. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/claude-fable-5-1-vs-meta-muse-spark-1-2">LLMBenchmark.ai, Claude Fable 5.1 vs Muse Spark 1.2</a></p>