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Claude Fable 5 vs Muse Spark 1.2

Claude Fable 5 leads Muse Spark 1.2 on coding, 79.3 to 55.7 on the Vibe Coding Index, and Muse Spark 1.2 costs 11.8x less per output token ($4.25 vs $50.00 per million). Updated October 22, 2026; 92 benchmarks have a result for both.

Replace Claude Fable 5 Replace Muse Spark 1.2
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
82
Muse Spark 1.2Meta
Coding
55.7
Overall
60.4
Output $/M
$4.25
10
vs boards won of 92 shared

Claude Fable 5 or Muse Spark 1.2: which to pick

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 55.7 for Muse Spark 1.2.

Pick Muse Spark 1.2 for output tokens 11.8x cheaper ($4.25 vs $50.00 per million) and a lower cost per solved task ($0.64 against $2.16).

Model AClaude Fable 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BMuse Spark 1.2Meta55.7/1005 independent benchmarks$0.64 per solved task
Shared results
92
Claude Fable 5 only
35
Muse Spark 1.2 only
5
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 1.2 55.7 from 5 benchmarks.
Widest category
Math, 21.1 points apart on average over 3 shared benchmarks.
Widest single gap
LiveBench browser: Claude Fable 5 92.0% against Muse Spark 1.2 36.0%, 56.0 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against Muse Spark 1.2 $4.25 per million output tokens, 11.8x apart.
Context window
Claude Fable 5 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 5BarsMuse Spark 1.2Ties
Coding160
Intelligence20
Agentic work151
Reasoning91
Math30
Knowledge74
Web design63
General241
All shared boards8210
CodingLike-for-likeSix of these boards feed the Vibe Coding Index160
Coding benchmarks for Claude Fable 5 and Muse Spark 1.2
BenchmarkClaude Fable 5Muse Spark 1.2Leader
LiveBench coding98.3%78.2%Claude Fable 5
LMArena WebDev16241534Claude Fable 5
AA Coding Index76.572.2Claude Fable 5
LiveCodeBench (Vals AI)89.8%Not measuredOnly Claude Fable 5 measured
SWE-bench Verified (Vals AI)95.0%86.6%Claude Fable 5
Terminal-Bench 4 (Vals AI)41.4%6.1%Claude Fable 5
Vibe Code Bench (Vals AI)90.3%79.1%Claude Fable 5
Code migration (Vals AI)55.1%29.9%Claude Fable 5
ProgramBench (Vals AI)2.0%0.5%Claude Fable 5
IOI (Vals AI)Not measured21.8%Only Muse Spark 1.2 measured
Terminal-Bench 2.1 (Vals AI)80.5%69.7%Claude Fable 5
SkillsBench (Vals AI)Not measured53.0%Only Muse Spark 1.2 measured
CyberBench (Vals AI)Not measured69.5%Only Muse Spark 1.2 measured
SciCode61.0%57.4%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%12.0%Claude Fable 5
GSO-Bench78.4%Not measuredOnly Claude Fable 5 measured
WeirdML91.9%60.3%Claude Fable 5
MirrorCode63.9%Not measuredOnly Claude Fable 5 measured
ALE-Bench2041.3Not measuredOnly Claude Fable 5 measured
LMArena Text: coding15181505Claude Fable 5
LMArena Text: software and IT15131505Claude Fable 5
LMArena WebDev: React16311526Claude Fable 5
LMArena WebDev: HTML16511543Claude Fable 5
LMArena WebDev: from an image1623Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5 and Muse Spark 1.2
BenchmarkClaude Fable 5Muse Spark 1.2Leader
AA Intelligence Index49.639.6Claude Fable 5
Epoch Capabilities Index163.4155.1Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index151
Agentic work benchmarks for Claude Fable 5 and Muse Spark 1.2
BenchmarkClaude Fable 5Muse Spark 1.2Leader
AA Agentic Index50.743.2Claude Fable 5
Design Arena: agents building web apps12611221Claude Fable 5
Design Arena: agents building full-stack apps12801210Claude Fable 5
Design Arena: agents building mobile apps12641181Claude Fable 5
Design Arena: agents building Android apps12841222Claude Fable 5
Design Arena: agents building Godot games1292Not measuredOnly Claude Fable 5 measured
Design Arena: agents building games12851179Claude Fable 5
Design Arena: HTML slides12271085Claude Fable 5
Design Arena: PowerPoint slides12701172Claude Fable 5
LiveBench research86.9%67.7%Claude Fable 5
LiveBench browser92.0%36.0%Claude Fable 5
LiveBench long agentic53.2%21.3%Claude Fable 5
SREBench (Vals AI)Not measured0.0%Only Muse Spark 1.2 measured
Finance Agent (Vals AI)56.3%60.6%Muse Spark 1.2
Tax Agent Bench (Vals AI)38.3%32.8%Claude Fable 5
Legal Research Bench (Vals AI)49.5%43.8%Claude Fable 5
Excel Modeling Benchmark (Vals AI)73.7%57.0%Claude Fable 5
BioMysteryBench (Vals AI)Not measured64.8%Only Muse Spark 1.2 measured
Terminal-Bench-Science (Vals AI)15.7%Not measuredOnly Claude Fable 5 measured
τ²-Bench Telecom98.5%Not measuredOnly Claude Fable 5 measured
APEX-Agents63.6%45.4%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 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index91
Reasoning benchmarks for Claude Fable 5 and Muse Spark 1.2
BenchmarkClaude Fable 5Muse Spark 1.2Leader
GPQA Diamond93.2%Not measuredOnly Claude Fable 5 measured
LiveBench reasoning89.7%90.0%Muse Spark 1.2
MMMU Pro (Vals AI)89.3%86.1%Claude Fable 5
GPQA Diamond (Artificial Analysis run)92.6%90.4%Claude Fable 5
Humanity's Last Exam (Artificial Analysis run)55.5%45.5%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%74.5%Claude Fable 5
Chess puzzles47.0%27.0%Claude Fable 5
Mystery game puzzles52.0%Not measuredOnly Claude Fable 5 measured
EBR-bench39.5%Not measuredOnly Claude Fable 5 measured
LMArena Text: hard prompts15071489Claude Fable 5
LMArena Text: expert15341475Claude Fable 5
LMArena Text: hard prompts in English15091487Claude Fable 5
LMArena Vision: diagrams13571317Claude Fable 5
LMArena Vision: homework1361Not measuredOnly Claude Fable 5 measured
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 index30
Math benchmarks for Claude Fable 5 and Muse Spark 1.2
BenchmarkClaude Fable 5Muse Spark 1.2Leader
OTIS Mock AIME100.0%Not measuredOnly Claude Fable 5 measured
FrontierMath, tiers 1 to 387.0%Not measuredOnly Claude Fable 5 measured
FrontierMath, tier 490.2%Not measuredOnly Claude Fable 5 measured
ProofBench95.0%43.0%Claude Fable 5
LMArena Text: math15161484Claude Fable 5
LMArena Text: mathematical work15151480Claude Fable 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index74
Knowledge benchmarks for Claude Fable 5 and Muse Spark 1.2
BenchmarkClaude Fable 5Muse Spark 1.2Leader
MMLU Pro91.5%88.3%Claude Fable 5
LegalBench (Vals AI)88.6%85.3%Claude Fable 5
CorpFin (Vals AI)71.8%70.9%Claude Fable 5
TaxEval (Vals AI)76.9%80.4%Muse Spark 1.2
MortgageTax (Vals AI)68.9%65.4%Claude Fable 5
MedCode (Vals AI)56.1%49.4%Claude Fable 5
SimpleQA Verified70.7%60.3%Claude Fable 5
LMArena Text: science15061500Claude Fable 5
LMArena Text: medicine and healthcare14801496Muse Spark 1.2
LMArena Text: legal and government14981517Muse Spark 1.2
LMArena Text: business and finance14801484Muse Spark 1.2
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 and Muse Spark 1.2
BenchmarkClaude Fable 5Muse Spark 1.2Leader
Design Arena: websites12951312Muse Spark 1.2
Design Arena: UI components13161298Claude Fable 5
Design Arena: game dev13351301Claude Fable 5
Design Arena: data viz13041334Muse Spark 1.2
Design Arena: 3D13181301Claude Fable 5
Design Arena: all code categories13101312Muse Spark 1.2
Design Arena: SVG13021284Claude Fable 5
Design Arena: ASCII art13291284Claude Fable 5
LiveBench design84.7%67.1%Claude Fable 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index241
General benchmarks for Claude Fable 5 and Muse Spark 1.2
BenchmarkClaude Fable 5Muse Spark 1.2Leader
LiveBench data analysis80.5%76.5%Claude Fable 5
Public Benefits Bench (Vals AI)70.4%68.5%Claude Fable 5
SAGE (Vals AI)51.9%47.7%Claude Fable 5
MedScribe (Vals AI)88.5%90.1%Muse Spark 1.2
Vals Multimodal Index74.2%69.8%Claude Fable 5
IFBench63.5%Not measuredOnly Claude Fable 5 measured
Long context reasoning (AA-LCR)82.3%79.0%Claude Fable 5
DTBench98.4%94.7%Claude Fable 5
LMCA61.2%48.4%Claude Fable 5
Surface Evolver Bench95.0%Not measuredOnly Claude Fable 5 measured
Furniture assembly35.8%Not measuredOnly Claude Fable 5 measured
LMArena Text14911482Claude Fable 5
LMArena Text: instruction following15021462Claude Fable 5
LMArena Text: creative writing14941436Claude Fable 5
LMArena Vision13251304Claude Fable 5
LMArena Text: English14981483Claude Fable 5
LMArena Text: non-English14821476Claude Fable 5
LMArena Text: Chinese15431509Claude Fable 5
LMArena Text: German1486Not measuredOnly Claude Fable 5 measured
LMArena Text: Japanese1504Not measuredOnly Claude Fable 5 measured
LMArena Text: Korean14871462Claude Fable 5
LMArena Text: French15051495Claude Fable 5
LMArena Text: Spanish14981484Claude Fable 5
LMArena Text: Russian15031483Claude Fable 5
LMArena Text: Polish1494Not measuredOnly Claude Fable 5 measured
LMArena Text: multi-turn15041502Claude Fable 5
LMArena Text: longer queries15101473Claude Fable 5
LMArena Text: writing and language15011453Claude Fable 5
LMArena Text: entertainment and media14821443Claude Fable 5
LMArena Vision: English13231291Claude Fable 5
LMArena Vision: Chinese1373Not measuredOnly Claude Fable 5 measured
LMArena Vision: reading text13371313Claude Fable 5
LMArena Vision: humor1341Not measuredOnly Claude Fable 5 measured
LMArena Vision: creative writing1338Not measuredOnly Claude Fable 5 measured
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 1.2
BenchmarkClaude Fable 5Muse 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$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$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$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 and Muse Spark 1.2
SpecificationAnthropic Claude Fable 5Meta Muse Spark 1.2
MakerAnthropicMeta
WeightsNo public weights listedNo public weights listed
ReleasedJune 9, 2026August 5, 2026
Context window1M1.05M
Input $/Mtok$10.00$1.25
Output $/Mtok$50.00$4.25
Coding index79.355.7
Independent measurements behind it65
Cost per solved task$2.16$0.64
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than Muse Spark 1.2 for coding?

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 55.7 for Muse Spark 1.2. Pick Muse Spark 1.2 for output tokens 11.8x cheaper ($4.25 vs $50.00 per million) and a lower cost per solved task ($0.64 against $2.16).

Which is cheaper, Claude Fable 5 or Muse Spark 1.2?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Muse Spark 1.2 costs $1.25 and $4.25. Per solved SWE-bench Verified task, Claude Fable 5 costs $2.16 and Muse Spark 1.2 $0.64.

Which has the bigger context window, Claude Fable 5 or Muse Spark 1.2?

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

How many benchmarks is the Claude Fable 5 vs Muse Spark 1.2 comparison based on?

92 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 1.2's on 5. 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-1-2">LLMBenchmark.ai, Claude Fable 5 vs Muse Spark 1.2</a></p>