Claude Fable 5.2 vs Muse Spark 1.2
Claude Fable 5.2 leads Muse Spark 1.2 on coding, 87.8 to 50.9 on the Vibe Coding Index, and Muse Spark 1.2 costs 9.4x less per output token ($4.25 vs $40.00 per million). Updated November 14, 2026; 32 benchmarks have a result for both.
vs boards won of 32 shared
Claude Fable 5.2 or Muse Spark 1.2: which to pick
Pick Claude Fable 5.2 for coding: it scores 87.8 on the Vibe Coding Index against 50.9 for Muse Spark 1.2.
Pick Muse Spark 1.2 for output tokens 9.4x cheaper ($4.25 vs $40.00 per million) and a larger context window (1.05M against 1M tokens).
Model AClaude Fable 5.2Anthropic87.8/1004 independent benchmarksNo cost per solved taskModel BMuse Spark 1.2Meta50.9/1004 independent benchmarks$0.64 per solved task
- Shared results
- 32
- Claude Fable 5.2 only
- 36
- Muse Spark 1.2 only
- 65
- 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.
Coding
Vibe Coding Index, six public coding benchmarks
Claude Fable 5.2
Claude Fable 5.2 scores 87.8 against 50.9.
4 benchmarks behind each score
Intelligence
AA Intelligence Index
No call
Only Claude Fable 5.2 has a AA Intelligence Index result, 64.6.
Directional only
Agentic work
AA Agentic Index
No call
Only Muse Spark 1.2 has a AA Agentic Index result, 43.2.
Directional only
Knowledge
MMLU Pro
No call
Only Muse Spark 1.2 has a MMLU Pro result, 88.3%.
Directional only
Web design
Design Arena: websites
Claude Fable 5.2
Claude Fable 5.2 leads, 1351 against 1309.
Same board, both measured
General
Vals Index
No call
Only Claude Fable 5.2 has a Vals Index result, 71.3%.
Directional only
Long documents
Listed context window
Muse Spark 1.2
Muse Spark 1.2 takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Muse Spark 1.2
Claude Fable 5.2 $0.028, Muse Spark 1.2 $0.0034 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Muse Spark 1.2 has the number, $0.64.
Directional only
At a glance
- Coding index
- Claude Fable 5.2 87.8 from 4 benchmarks, Muse Spark 1.2 50.9 from 4 benchmarks.
- Widest category
- Math, 57.0 points apart on average over 1 shared benchmark.
- Widest single gap
- Terminal-Bench 4 (Vals AI): Claude Fable 5.2 65.2% against Muse Spark 1.2 6.1%, 78.8 points apart on a 0 to 100 scale.
- Output price
- Claude Fable 5.2 $40.00 against Muse Spark 1.2 $4.25 per million output tokens, 9.4x apart.
- Context window
- Claude Fable 5.2 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.
| Category | Claude Fable 5.2 | Bars | Muse Spark 1.2 | Ties |
|---|---|---|---|---|
| Coding | 10 | 0 | ||
| Intelligence | 1 | 0 | ||
| Agentic work | 6 | 1 | ||
| Reasoning | 3 | 0 | ||
| Math | 1 | 0 | ||
| Knowledge | 1 | 0 | ||
| Web design | 5 | 0 | ||
| General | 4 | 0 | ||
| All shared boards | 31 | 1 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index100
| Benchmark | Claude Fable 5.2 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| LiveBench coding | 79.2% | Not measured | Only Claude Fable 5.2 measured |
| LMArena WebDev | 1838 | 1534 | Claude Fable 5.2 |
| AA Coding Index | Not measured | 72.2 | Only Muse Spark 1.2 measured |
| SWE-bench Verified (Vals AI) | Not measured | 86.6% | Only Muse Spark 1.2 measured |
| Terminal-Bench 4 (Vals AI) | 65.2% | 6.1% | Claude Fable 5.2 |
| Vibe Code Bench (Vals AI) | 93.8% | 79.1% | Claude Fable 5.2 |
| Code migration (Vals AI) | Not measured | 29.9% | Only Muse Spark 1.2 measured |
| ProgramBench (Vals AI) | 19.0% | 0.5% | Claude Fable 5.2 |
| IOI (Vals AI) | Not measured | 21.8% | Only Muse Spark 1.2 measured |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 69.7% | Only Muse Spark 1.2 measured |
| SWE-bench Multimodal (Vals AI) | 62.3% | Not measured | Only Claude Fable 5.2 measured |
| SkillsBench (Vals AI) | Not measured | 53.0% | Only Muse Spark 1.2 measured |
| CyberBench (Vals AI) | Not measured | 69.5% | Only Muse Spark 1.2 measured |
| SciCode | 67.7% | 57.4% | Claude Fable 5.2 |
| Terminal-Bench 4.0 (Artificial Analysis run) | 61.6% | 7.1% | Claude Fable 5.2 |
| FrontierCode 2.0 | 49.1% | Not measured | Only Claude Fable 5.2 measured |
| FrontierSWE | 69.9% | 12.0% | Claude Fable 5.2 |
| WeirdML | Not measured | 60.3% | Only Muse Spark 1.2 measured |
| ALE-Bench | 2509.8 | Not measured | Only Claude Fable 5.2 measured |
| LMArena Text: coding | Not measured | 1506 | Only Muse Spark 1.2 measured |
| LMArena Text: software and IT | Not measured | 1506 | Only Muse Spark 1.2 measured |
| LMArena WebDev: React | 1915 | 1525 | Claude Fable 5.2 |
| LMArena WebDev: HTML | 1738 | 1542 | Claude Fable 5.2 |
| GameBench 2 | 99.1 | 57.3 | Claude Fable 5.2 |
| CursorBench 4.0 | 60.0% | Not measured | Only Claude Fable 5.2 measured |
| ProgramBench | Not measured | 0.0% | Only Muse Spark 1.2 measured |
| Neither model has a result on the other 26 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Claude Fable 5.2 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| AA Intelligence Index | 64.6 | Not measured | Only Claude Fable 5.2 measured |
| Epoch Capabilities Index | 173.4 | 155.0 | Claude Fable 5.2 |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index61
| Benchmark | Claude Fable 5.2 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 43.2 | Only Muse Spark 1.2 measured |
| Design Arena: agents building web apps | Not measured | 1199 | Only Muse Spark 1.2 measured |
| Design Arena: agents building full-stack apps | 1402 | 1184 | Claude Fable 5.2 |
| Design Arena: agents building mobile apps | 1325 | 1173 | Claude Fable 5.2 |
| Design Arena: agents building Android apps | Not measured | 1210 | Only Muse Spark 1.2 measured |
| Design Arena: agents building games | Not measured | 1122 | Only Muse Spark 1.2 measured |
| Design Arena: HTML slides | Not measured | 1028 | Only Muse Spark 1.2 measured |
| Design Arena: PowerPoint slides | Not measured | 1159 | Only Muse Spark 1.2 measured |
| Design Arena: spreadsheets | 1434 | 1016 | Claude Fable 5.2 |
| LiveBench research | 94.5% | Not measured | Only Claude Fable 5.2 measured |
| LiveBench browser | 86.9% | Not measured | Only Claude Fable 5.2 measured |
| LiveBench long agentic | 82.9% | Not measured | Only Claude Fable 5.2 measured |
| SREBench (Vals AI) | Not measured | 0.0% | Only Muse Spark 1.2 measured |
| Finance Agent (Vals AI) | Not measured | 60.6% | Only Muse Spark 1.2 measured |
| Tax Agent Bench (Vals AI) | 32.1% | 32.8% | Muse Spark 1.2 |
| Legal Research Bench (Vals AI) | 46.1% | 43.8% | Claude Fable 5.2 |
| Harvey's Legal Agent Benchmark (Vals AI) | 5.0% | Not measured | Only Claude Fable 5.2 measured |
| Excel Modeling Benchmark (Vals AI) | Not measured | 57.0% | Only Muse Spark 1.2 measured |
| BioMysteryBench (Vals AI) | 83.7% | 64.8% | Claude Fable 5.2 |
| Terminal-Bench-Science (Vals AI) | 55.7% | Not measured | Only Claude Fable 5.2 measured |
| Vals Science Index | 63.7% | Not measured | Only Claude Fable 5.2 measured |
| APEX-Agents | 80.1% | 45.4% | Claude Fable 5.2 |
| Remote Labor Index | 41.3% | Not measured | Only Claude Fable 5.2 measured |
| SpireClimb | 15.5% | Not measured | Only Claude Fable 5.2 measured |
| Toolathlon-Verified | Not measured | 75.9% | Only Muse Spark 1.2 measured |
| Neither model has a result on the other 19 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index30
| Benchmark | Claude Fable 5.2 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| LiveBench reasoning | 88.8% | Not measured | Only Claude Fable 5.2 measured |
| MysteryMechanism (Vals AI) | 51.8% | Not measured | Only Claude Fable 5.2 measured |
| MMMU Pro (Vals AI) | Not measured | 86.1% | Only Muse Spark 1.2 measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 90.4% | Only Muse Spark 1.2 measured |
| Humanity's Last Exam (Artificial Analysis run) | 74.3% | 45.5% | Claude Fable 5.2 |
| HLE-Diamond (Artificial Analysis run) | 80.2% | Not measured | Only Claude Fable 5.2 measured |
| CritPt v2, hard subset (Artificial Analysis run) | 76.5% | Not measured | Only Claude Fable 5.2 measured |
| GPQA Diamond (Epoch AI run) | 93.9% | Not measured | Only Claude Fable 5.2 measured |
| ARC-AGI | 98.5% | Not measured | Only Claude Fable 5.2 measured |
| ARC-AGI-2 | 93.8% | Not measured | Only Claude Fable 5.2 measured |
| SimpleBench | 94.9% | 74.5% | Claude Fable 5.2 |
| Chess puzzles | 79.0% | 27.0% | Claude Fable 5.2 |
| Mystery game puzzles | 90.0% | Not measured | Only Claude Fable 5.2 measured |
| EBR-bench | 90.5% | Not measured | Only Claude Fable 5.2 measured |
| LMArena Text: hard prompts | Not measured | 1492 | Only Muse Spark 1.2 measured |
| LMArena Text: expert | Not measured | 1486 | Only Muse Spark 1.2 measured |
| LMArena Text: hard prompts in English | Not measured | 1489 | Only Muse Spark 1.2 measured |
| LMArena Vision: diagrams | Not measured | 1314 | Only Muse Spark 1.2 measured |
| Humanity's Last Exam (Scale run) | 72.4% | Not measured | Only Claude Fable 5.2 measured |
| GoBench | 2566 | Not measured | Only Claude Fable 5.2 measured |
| Neither model has a result on the other 6 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Claude Fable 5.2 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| OTIS Mock AIME | 99.7% | Not measured | Only Claude Fable 5.2 measured |
| FrontierMath, tiers 1 to 3 | 95.1% | Not measured | Only Claude Fable 5.2 measured |
| FrontierMath, tier 4 | 100.0% | Not measured | Only Claude Fable 5.2 measured |
| ProofBench | 100.0% | 43.0% | Claude Fable 5.2 |
| LMArena Text: math | Not measured | 1478 | Only Muse Spark 1.2 measured |
| LMArena Text: mathematical work | Not measured | 1477 | Only Muse Spark 1.2 measured |
| MathArena | 82.8% | Not measured | Only Claude Fable 5.2 measured |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Claude Fable 5.2 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 88.3% | Only Muse Spark 1.2 measured |
| LegalBench (Vals AI) | Not measured | 85.3% | Only Muse Spark 1.2 measured |
| CorpFin (Vals AI) | Not measured | 70.9% | Only Muse Spark 1.2 measured |
| TaxEval (Vals AI) | Not measured | 80.4% | Only Muse Spark 1.2 measured |
| MortgageTax (Vals AI) | Not measured | 65.4% | Only Muse Spark 1.2 measured |
| MedCode (Vals AI) | Not measured | 49.4% | Only Muse Spark 1.2 measured |
| AA-Omniscience | 66.8 | Not measured | Only Claude Fable 5.2 measured |
| SimpleQA Verified | 94.0% | 60.3% | Claude Fable 5.2 |
| LMArena Text: science | Not measured | 1502 | Only Muse Spark 1.2 measured |
| LMArena Text: medicine and healthcare | Not measured | 1490 | Only Muse Spark 1.2 measured |
| LMArena Text: legal and government | Not measured | 1505 | Only Muse Spark 1.2 measured |
| LMArena Text: business and finance | Not measured | 1484 | Only Muse Spark 1.2 measured |
| PRBench Finance | 47.1% | Not measured | Only Claude Fable 5.2 measured |
| PRBench Legal | 49.0% | Not measured | Only Claude Fable 5.2 measured |
| Neither model has a result on the other 7 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index50
| Benchmark | Claude Fable 5.2 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| Design Arena: websites | 1351 | 1309 | Claude Fable 5.2 |
| Design Arena: UI components | 1371 | 1299 | Claude Fable 5.2 |
| Design Arena: game dev | 1396 | 1294 | Claude Fable 5.2 |
| Design Arena: data viz | Not measured | 1329 | Only Muse Spark 1.2 measured |
| Design Arena: 3D | 1517 | 1283 | Claude Fable 5.2 |
| Design Arena: all code categories | 1373 | 1306 | Claude Fable 5.2 |
| Design Arena: SVG | Not measured | 1272 | Only Muse Spark 1.2 measured |
| Design Arena: ASCII art | Not measured | 1277 | Only Muse Spark 1.2 measured |
| LiveBench design | 85.1% | Not measured | Only Claude Fable 5.2 measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index40
| Benchmark | Claude Fable 5.2 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| Vals Index | 71.3% | Not measured | Only Claude Fable 5.2 measured |
| LiveBench data analysis | 81.5% | Not measured | Only Claude Fable 5.2 measured |
| Public Benefits Bench (Vals AI) | Not measured | 68.5% | Only Muse Spark 1.2 measured |
| MedScribe (Vals AI) | Not measured | 90.1% | Only Muse Spark 1.2 measured |
| Vals Multimodal Index | Not measured | 69.8% | Only Muse Spark 1.2 measured |
| Long context reasoning (AA-LCR) | 83.3% | 79.0% | Claude Fable 5.2 |
| GDPval-AA | 1831 | 1478 | Claude Fable 5.2 |
| DTBench | 99.2% | 94.7% | Claude Fable 5.2 |
| LMCA | 70.6% | 48.4% | Claude Fable 5.2 |
| Furniture assembly | 90.0% | Not measured | Only Claude Fable 5.2 measured |
| LMArena Text | Not measured | 1483 | Only Muse Spark 1.2 measured |
| LMArena Text: instruction following | Not measured | 1469 | Only Muse Spark 1.2 measured |
| LMArena Text: creative writing | Not measured | 1439 | Only Muse Spark 1.2 measured |
| LMArena Vision | Not measured | 1305 | Only Muse Spark 1.2 measured |
| LMArena Text: English | Not measured | 1482 | Only Muse Spark 1.2 measured |
| LMArena Text: non-English | Not measured | 1478 | Only Muse Spark 1.2 measured |
| LMArena Text: Chinese | Not measured | 1517 | Only Muse Spark 1.2 measured |
| LMArena Text: German | Not measured | 1490 | Only Muse Spark 1.2 measured |
| LMArena Text: Japanese | Not measured | 1488 | Only Muse Spark 1.2 measured |
| LMArena Text: Korean | Not measured | 1453 | Only Muse Spark 1.2 measured |
| LMArena Text: French | Not measured | 1502 | Only Muse Spark 1.2 measured |
| LMArena Text: Spanish | Not measured | 1490 | Only Muse Spark 1.2 measured |
| LMArena Text: Russian | Not measured | 1488 | Only Muse Spark 1.2 measured |
| LMArena Text: Polish | Not measured | 1508 | Only Muse Spark 1.2 measured |
| LMArena Text: multi-turn | Not measured | 1498 | Only Muse Spark 1.2 measured |
| LMArena Text: longer queries | Not measured | 1476 | Only Muse Spark 1.2 measured |
| LMArena Text: writing and language | Not measured | 1456 | Only Muse Spark 1.2 measured |
| LMArena Text: entertainment and media | Not measured | 1445 | Only Muse Spark 1.2 measured |
| LMArena Vision: English | Not measured | 1292 | Only Muse Spark 1.2 measured |
| LMArena Vision: reading text | Not measured | 1312 | Only Muse Spark 1.2 measured |
| Neither model has a result on the other 19 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Fable 5.2 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| 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 5.2$0.028Fits 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 5.2$0.520Fits 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$2.00Fits 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.
| Specification | Anthropic Claude Fable 5.2 | Meta Muse Spark 1.2 |
|---|---|---|
| Maker | Anthropic | Meta |
| Weights | No public weights listed | No public weights listed |
| Released | November 9, 2026 | August 5, 2026 |
| Context window | 1M | 1.05M |
| Input $/Mtok | $8.00 | $1.25 |
| Output $/Mtok | $40.00 | $4.25 |
| Coding index | 87.8 | 50.9 |
| Independent measurements behind it | 4 | 4 |
| Cost per solved task | Not computable | $0.64 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Fable 5.2 better than Muse Spark 1.2 for coding?
Pick Claude Fable 5.2 for coding: it scores 87.8 on the Vibe Coding Index against 50.9 for Muse Spark 1.2. Pick Muse Spark 1.2 for output tokens 9.4x cheaper ($4.25 vs $40.00 per million) and a larger context window (1.05M against 1M tokens).
Which is cheaper, Claude Fable 5.2 or Muse Spark 1.2?
Claude Fable 5.2 costs $8.00 per million input tokens and $40.00 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 5.2 or Muse Spark 1.2?
Muse Spark 1.2, with 1.05M tokens against 1M.
How many benchmarks is the Claude Fable 5.2 vs Muse Spark 1.2 comparison based on?
32 benchmarks have a result for both models as of November 14, 2026. Claude Fable 5.2's coding index rests on 4 independent benchmarks and Muse Spark 1.2's on 4. Where only one model has a result, the page says so instead of naming a winner.