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Claude Fable 5 vs Muse Spark 1.3

Claude Fable 5 leads Muse Spark 1.3 on coding, 79.3 to 57.4 on the Vibe Coding Index, and Muse Spark 1.3 costs 11.8x less per output token ($4.25 vs $50.00 per million). Updated October 22, 2026; 89 benchmarks have a result for both.

Replace Claude Fable 5 Replace Muse Spark 1.3
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
65
Muse Spark 1.3Meta
Coding
57.4
Overall
68.6
Output $/M
$4.25
23
vs boards won of 89 shared, 1 tied

Claude Fable 5 or Muse Spark 1.3: which to pick

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 57.4 for Muse Spark 1.3.

Pick Muse Spark 1.3 for output tokens 11.8x cheaper ($4.25 vs $50.00 per million) and a larger context window (1.05M against 1M tokens).

Model AClaude Fable 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BMuse Spark 1.3Meta57.4/1004 independent benchmarksNo cost per solved task
Shared results
89
Claude Fable 5 only
38
Muse Spark 1.3 only
3
Like-for-like categories
8 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.

At a glance

Coding index
Claude Fable 5 79.3 from 6 benchmarks, Muse Spark 1.3 57.4 from 4 benchmarks.
Widest category
Math, 16.9 points apart on average over 6 shared benchmarks.
Widest single gap
FrontierMath, tier 4: Claude Fable 5 90.2% against Muse Spark 1.3 46.3%, 43.9 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against Muse Spark 1.3 $4.25 per million output tokens, 11.8x apart.
Context window
Claude Fable 5 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 5BarsMuse Spark 1.3Ties
Coding124
Intelligence20
Agentic work114
Reasoning811 tie
Math60
Knowledge04
Web design45
General225
All shared boards65231 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index124
Coding benchmarks for Claude Fable 5 and Muse Spark 1.3
BenchmarkClaude Fable 5Muse Spark 1.3Leader
LiveBench coding98.3%90.2%Claude Fable 5
LMArena WebDev16241659Muse Spark 1.3
AA Coding Index76.575.8Claude Fable 5
LiveCodeBench (Vals AI)89.8%Not measuredOnly Claude Fable 5 measured
SWE-bench Verified (Vals AI)95.0%Not measuredOnly Claude Fable 5 measured
Terminal-Bench 4 (Vals AI)41.4%10.6%Claude Fable 5
Vibe Code Bench (Vals AI)90.3%82.9%Claude Fable 5
Code migration (Vals AI)55.1%27.6%Claude Fable 5
ProgramBench (Vals AI)2.0%0.5%Claude Fable 5
IOI (Vals AI)Not measured43.9%Only Muse Spark 1.3 measured
Terminal-Bench 2.1 (Vals AI)80.5%72.3%Claude Fable 5
CyberBench (Vals AI)Not measured69.4%Only Muse Spark 1.3 measured
SciCode61.0%59.7%Claude Fable 5
Terminal-Bench Hard (Artificial Analysis run)62.9%Not measuredOnly Claude Fable 5 measured
FrontierCode53.5%Not measuredOnly Claude Fable 5 measured
FrontierSWE47.0%25.8%Claude Fable 5
GSO-Bench78.4%Not measuredOnly Claude Fable 5 measured
WeirdML91.9%Not measuredOnly Claude Fable 5 measured
MirrorCode63.9%Not measuredOnly Claude Fable 5 measured
ALE-Bench2041.31688.3Claude Fable 5
LMArena Text: coding15181510Claude Fable 5
LMArena Text: software and IT15131511Claude Fable 5
LMArena WebDev: React16311672Muse Spark 1.3
LMArena WebDev: HTML16511653Muse Spark 1.3
LMArena WebDev: from an image16231640Muse Spark 1.3
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5 and Muse Spark 1.3
BenchmarkClaude Fable 5Muse Spark 1.3Leader
AA Intelligence Index49.648.1Claude Fable 5
Epoch Capabilities Index163.4157.2Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index114
Agentic work benchmarks for Claude Fable 5 and Muse Spark 1.3
BenchmarkClaude Fable 5Muse Spark 1.3Leader
AA Agentic Index50.755.5Muse Spark 1.3
Design Arena: agents building web apps12611297Muse Spark 1.3
Design Arena: agents building full-stack apps12801295Muse Spark 1.3
Design Arena: agents building mobile apps12641218Claude Fable 5
Design Arena: agents building Android apps1284Not measuredOnly Claude Fable 5 measured
Design Arena: agents building Godot games12921241Claude Fable 5
Design Arena: agents building games1285Not measuredOnly Claude Fable 5 measured
Design Arena: HTML slides1227Not measuredOnly Claude Fable 5 measured
Design Arena: PowerPoint slides12701219Claude Fable 5
Design Arena: spreadsheetsNot measured1062Only Muse Spark 1.3 measured
LiveBench research86.9%68.6%Claude Fable 5
LiveBench browser92.0%80.0%Claude Fable 5
LiveBench long agentic53.2%40.4%Claude Fable 5
Finance Agent (Vals AI)56.3%58.9%Muse Spark 1.3
Tax Agent Bench (Vals AI)38.3%36.0%Claude Fable 5
Legal Research Bench (Vals AI)49.5%40.9%Claude Fable 5
Excel Modeling Benchmark (Vals AI)73.7%62.7%Claude Fable 5
Terminal-Bench-Science (Vals AI)15.7%4.3%Claude Fable 5
τ²-Bench Telecom98.5%Not measuredOnly Claude Fable 5 measured
APEX-Agents63.6%58.6%Claude Fable 5
Remote Labor Index16.1%Not measuredOnly Claude Fable 5 measured
PostTrainBench41.8%Not measuredOnly Claude Fable 5 measured
Vending-Bench 2$5,680Not measuredOnly Claude Fable 5 measured
LMArena Search1229Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index81
Reasoning benchmarks for Claude Fable 5 and Muse Spark 1.3
BenchmarkClaude Fable 5Muse Spark 1.3Leader
GPQA Diamond93.2%Not measuredOnly Claude Fable 5 measured
LiveBench reasoning89.7%89.7%Tie
MMMU Pro (Vals AI)89.3%Not measuredOnly Claude Fable 5 measured
GPQA Diamond (Artificial Analysis run)92.6%94.1%Muse Spark 1.3
Humanity's Last Exam (Artificial Analysis run)55.5%48.7%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%Not measuredOnly Claude Fable 5 measured
ARC-AGI98.5%Not measuredOnly Claude Fable 5 measured
ARC-AGI-289.2%Not measuredOnly Claude Fable 5 measured
SimpleBench81.9%Not measuredOnly Claude Fable 5 measured
Chess puzzles47.0%37.0%Claude Fable 5
Mystery game puzzles52.0%25.0%Claude Fable 5
EBR-bench39.5%Not measuredOnly Claude Fable 5 measured
LMArena Text: hard prompts15071503Claude Fable 5
LMArena Text: expert15341519Claude Fable 5
LMArena Text: hard prompts in English15091500Claude Fable 5
LMArena Vision: diagrams13571330Claude Fable 5
LMArena Vision: homework13611296Claude Fable 5
Kagi LLM Benchmark91.4%Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Fable 5 and Muse Spark 1.3
BenchmarkClaude Fable 5Muse Spark 1.3Leader
OTIS Mock AIME100.0%99.2%Claude Fable 5
FrontierMath, tiers 1 to 387.0%74.4%Claude Fable 5
FrontierMath, tier 490.2%46.3%Claude Fable 5
ProofBench95.0%58.0%Claude Fable 5
LMArena Text: math15161497Claude Fable 5
LMArena Text: mathematical work15151491Claude Fable 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index04
Knowledge benchmarks for Claude Fable 5 and Muse Spark 1.3
BenchmarkClaude Fable 5Muse Spark 1.3Leader
MMLU Pro91.5%Not measuredOnly Claude Fable 5 measured
LegalBench (Vals AI)88.6%Not measuredOnly Claude Fable 5 measured
CorpFin (Vals AI)71.8%Not measuredOnly Claude Fable 5 measured
TaxEval (Vals AI)76.9%Not measuredOnly Claude Fable 5 measured
MortgageTax (Vals AI)68.9%Not measuredOnly Claude Fable 5 measured
MedCode (Vals AI)56.1%Not measuredOnly Claude Fable 5 measured
SimpleQA Verified70.7%Not measuredOnly Claude Fable 5 measured
LMArena Text: science15061507Muse Spark 1.3
LMArena Text: medicine and healthcare14801493Muse Spark 1.3
LMArena Text: legal and government14981499Muse Spark 1.3
LMArena Text: business and finance14801490Muse Spark 1.3
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index45
Web design benchmarks for Claude Fable 5 and Muse Spark 1.3
BenchmarkClaude Fable 5Muse Spark 1.3Leader
Design Arena: websites12951356Muse Spark 1.3
Design Arena: UI components13161349Muse Spark 1.3
Design Arena: game dev13351328Claude Fable 5
Design Arena: data viz13041343Muse Spark 1.3
Design Arena: 3D13181358Muse Spark 1.3
Design Arena: all code categories13101352Muse Spark 1.3
Design Arena: SVG13021301Claude Fable 5
Design Arena: ASCII art13291278Claude Fable 5
LiveBench design84.7%74.8%Claude Fable 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index225
General benchmarks for Claude Fable 5 and Muse Spark 1.3
BenchmarkClaude Fable 5Muse Spark 1.3Leader
LiveBench data analysis80.5%79.6%Claude Fable 5
Public Benefits Bench (Vals AI)70.4%Not measuredOnly Claude Fable 5 measured
SAGE (Vals AI)51.9%Not measuredOnly Claude Fable 5 measured
MedScribe (Vals AI)88.5%Not measuredOnly Claude Fable 5 measured
Vals Multimodal Index74.2%Not measuredOnly Claude Fable 5 measured
IFBench63.5%Not measuredOnly Claude Fable 5 measured
Long context reasoning (AA-LCR)82.3%83.0%Muse Spark 1.3
DTBench98.4%96.5%Claude Fable 5
LMCA61.2%53.9%Claude Fable 5
Surface Evolver Bench95.0%Not measuredOnly Claude Fable 5 measured
Furniture assembly35.8%Not measuredOnly Claude Fable 5 measured
LMArena Text14911490Claude Fable 5
LMArena Text: instruction following15021479Claude Fable 5
LMArena Text: creative writing14941462Claude Fable 5
LMArena Vision13251308Claude Fable 5
LMArena Text: English14981495Claude Fable 5
LMArena Text: non-English14821481Claude Fable 5
LMArena Text: Chinese15431532Claude Fable 5
LMArena Text: German14861513Muse Spark 1.3
LMArena Text: Japanese15041470Claude Fable 5
LMArena Text: Korean14871490Muse Spark 1.3
LMArena Text: French15051511Muse Spark 1.3
LMArena Text: Spanish14981496Claude Fable 5
LMArena Text: Russian15031491Claude Fable 5
LMArena Text: Polish14941490Claude Fable 5
LMArena Text: multi-turn15041487Claude Fable 5
LMArena Text: longer queries15101488Claude Fable 5
LMArena Text: writing and language15011470Claude Fable 5
LMArena Text: entertainment and media14821457Claude Fable 5
LMArena Vision: English13231298Claude Fable 5
LMArena Vision: Chinese13731384Muse Spark 1.3
LMArena Vision: reading text13371319Claude Fable 5
LMArena Vision: humor13411293Claude Fable 5
LMArena Vision: creative writing13381296Claude Fable 5
LMArena Document1496Not measuredOnly Claude Fable 5 measured
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 Fable 5 and Muse Spark 1.3
BenchmarkClaude Fable 5Muse 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$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$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$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 and Muse Spark 1.3
SpecificationAnthropic Claude Fable 5Meta Muse Spark 1.3
MakerAnthropicMeta
WeightsNo public weights listedNo public weights listed
ReleasedJune 9, 2026September 2, 2026
Context window1M1.05M
Input $/Mtok$10.00$1.25
Output $/Mtok$50.00$4.25
Coding index79.357.4
Independent measurements behind it64
Cost per solved task$2.16Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than Muse Spark 1.3 for coding?

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 57.4 for Muse Spark 1.3. Pick Muse Spark 1.3 for output tokens 11.8x cheaper ($4.25 vs $50.00 per million) and a larger context window (1.05M against 1M tokens).

Which is cheaper, Claude Fable 5 or Muse Spark 1.3?

Claude Fable 5 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 Claude Fable 5 only.

Which has the bigger context window, Claude Fable 5 or Muse Spark 1.3?

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

How many benchmarks is the Claude Fable 5 vs Muse Spark 1.3 comparison based on?

89 benchmarks have a result for both models as of October 22, 2026. Claude Fable 5's coding index rests on 6 independent benchmarks and Muse Spark 1.3's on 4. 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-vs-meta-muse-spark-1-3">LLMBenchmark.ai, Claude Fable 5 vs Muse Spark 1.3</a></p>