Claude Fable 5.1 vs Muse Ember
Claude Fable 5.1 leads Muse Ember on coding, 82.8 to 64.9 on the Vibe Coding Index, and Muse Ember costs 100.0x less per output token ($0.50 vs $50.00 per million). Updated November 14, 2026; 13 benchmarks have a result for both.
vs boards won of 13 shared
Claude Fable 5.1 or Muse Ember: which to pick
Pick Claude Fable 5.1 for coding: it scores 82.8 on the Vibe Coding Index against 64.9 for Muse Ember.
Pick Muse Ember for output tokens 100.0x cheaper ($0.50 vs $50.00 per million) and a larger context window (1.05M against 1M tokens).
Model AClaude Fable 5.1Anthropic82.8/1005 independent benchmarksNo cost per solved taskModel BMuse EmberMeta64.9/1003 independent benchmarksNo cost per solved task
- Shared results
- 13
- Claude Fable 5.1 only
- 135
- Muse Ember only
- 2
- Like-for-like categories
- 4 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 5.1
Claude Fable 5.1 scores 82.8 against 64.9.
5 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only Claude Fable 5.1 has a AA Intelligence Index result, 50.0.
Directional only
Agentic work
AA Agentic Index
No call
Only Claude Fable 5.1 has a AA Agentic Index result, 57.2.
Directional only
Reasoning
GPQA Diamond
No call
Only Claude Fable 5.1 has a GPQA Diamond result, 93.4%.
Directional only
Knowledge
MMLU Pro
No call
Only Claude Fable 5.1 has a MMLU Pro result, 92.4%.
Directional only
Web design
Design Arena: websites
No call
Only Claude Fable 5.1 has a Design Arena: websites result, 1305.
Directional only
General
Vals Index
No call
Only Muse Ember has a Vals Index result, 60.5%.
Directional only
Long documents
Listed context window
Muse Ember
Muse Ember takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Muse Ember
Claude Fable 5.1 $0.035, Muse Ember $0.0003 per turn.
List prices
At a glance
- Coding index
- Claude Fable 5.1 82.8 from 5 benchmarks, Muse Ember 64.9 from 3 benchmarks.
- Widest category
- Reasoning, 29.0 points apart on average over 2 shared benchmarks.
- Widest single gap
- HLE-Diamond (Artificial Analysis run): Claude Fable 5.1 60.1% against Muse Ember 25.1%, 35.0 points apart on a 0 to 100 scale.
- Output price
- Claude Fable 5.1 $50.00 against Muse Ember $0.50 per million output tokens, 100.0x apart.
- Context window
- Claude Fable 5.1 takes 1M tokens, Muse Ember 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 5.1 | Bars | Muse Ember | Ties |
|---|---|---|---|---|
| Coding | 7 | 0 | ||
| Agentic work | 3 | 0 | ||
| Reasoning | 2 | 0 | ||
| Knowledge | 1 | 0 | ||
| All shared boards | 13 | 0 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index70
| Benchmark | Claude Fable 5.1 | Muse Ember | Leader |
|---|---|---|---|
| LiveBench coding | 89.7% | Not measured | Only Claude Fable 5.1 measured |
| LMArena WebDev | 1742 | 1609 | Claude Fable 5.1 |
| AA Coding Index | 80.7 | Not measured | Only Claude Fable 5.1 measured |
| LiveCodeBench (Vals AI) | 90.5% | Not measured | Only Claude Fable 5.1 measured |
| Terminal-Bench 4 (Vals AI) | 58.1% | 39.4% | Claude Fable 5.1 |
| Vibe Code Bench (Vals AI) | 90.3% | 83.7% | Claude Fable 5.1 |
| Code migration (Vals AI) | 54.6% | Not measured | Only Claude Fable 5.1 measured |
| ProgramBench (Vals AI) | 7.0% | Not measured | Only Claude Fable 5.1 measured |
| IOI (Vals AI) | 90.8% | Not measured | Only Claude Fable 5.1 measured |
| Terminal-Bench 2.1 (Vals AI) | 85.0% | Not measured | Only Claude Fable 5.1 measured |
| SWE-bench Multimodal (Vals AI) | 61.3% | Not measured | Only Claude Fable 5.1 measured |
| Vibe Code Bench 1-100 (Vals AI) | 28.0% | Not measured | Only Claude Fable 5.1 measured |
| SkillsBench (Vals AI) | 61.5% | Not measured | Only Claude Fable 5.1 measured |
| CyberBench (Vals AI) | 70.4% | Not measured | Only Claude Fable 5.1 measured |
| SciCode | 63.1% | Not measured | Only Claude Fable 5.1 measured |
| Terminal-Bench 4.0 (Artificial Analysis run) | 55.1% | 40.9% | Claude Fable 5.1 |
| FrontierCode 2.0 | 35.7% | 27.2% | Claude Fable 5.1 |
| FrontierCode | 50.9% | Not measured | Only Claude Fable 5.1 measured |
| FrontierSWE | 56.3% | Not measured | Only Claude Fable 5.1 measured |
| GSO-Bench | 88.2% | Not measured | Only Claude Fable 5.1 measured |
| WeirdML | 92.9% | Not measured | Only Claude Fable 5.1 measured |
| MirrorCode | 93.3% | Not measured | Only Claude Fable 5.1 measured |
| ALE-Bench | 2143.2 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: coding | 1527 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: software and IT | 1525 | Not measured | Only Claude Fable 5.1 measured |
| LMArena WebDev: React | 1787 | 1616 | Claude Fable 5.1 |
| LMArena WebDev: HTML | 1681 | 1621 | Claude Fable 5.1 |
| LMArena WebDev: from an image | 1724 | Not measured | Only Claude Fable 5.1 measured |
| SWE-Bench Pro V2 | 99.1% | Not measured | Only Claude Fable 5.1 measured |
| SWE Atlas: Codebase QnA | 60.0% | Not measured | Only Claude Fable 5.1 measured |
| SWE Atlas: Refactoring | 56.7% | Not measured | Only Claude Fable 5.1 measured |
| SWE Atlas: Test Writing | 67.0% | Not measured | Only Claude Fable 5.1 measured |
| GameBench 2 | 94.0 | Not measured | Only Claude Fable 5.1 measured |
| Terminal-Bench 4.0 | 57.9% | Not measured | Only Claude Fable 5.1 measured |
| CursorBench 4.0 | 51.8% | Not measured | Only Claude Fable 5.1 measured |
| ProgramBench | 9.0% | Not measured | Only Claude Fable 5.1 measured |
| Neither model has a result on the other 16 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index2 boards, none shared
| Benchmark | Claude Fable 5.1 | Muse Ember | Leader |
|---|---|---|---|
| AA Intelligence Index | 50.0 | Not measured | Only Claude Fable 5.1 measured |
| Epoch Capabilities Index | 167.0 | Not measured | Only Claude Fable 5.1 measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index30
| Benchmark | Claude Fable 5.1 | Muse Ember | Leader |
|---|---|---|---|
| AA Agentic Index | 57.2 | Not measured | Only Claude Fable 5.1 measured |
| Design Arena: agents building web apps | 1315 | Not measured | Only Claude Fable 5.1 measured |
| Design Arena: agents building full-stack apps | 1301 | Not measured | Only Claude Fable 5.1 measured |
| Design Arena: agents building mobile apps | 1253 | Not measured | Only Claude Fable 5.1 measured |
| Design Arena: agents building Godot games | 1304 | Not measured | Only Claude Fable 5.1 measured |
| Design Arena: HTML slides | 1390 | Not measured | Only Claude Fable 5.1 measured |
| Design Arena: PowerPoint slides | 1316 | Not measured | Only Claude Fable 5.1 measured |
| Design Arena: spreadsheets | 1346 | Not measured | Only Claude Fable 5.1 measured |
| LiveBench research | 88.5% | Not measured | Only Claude Fable 5.1 measured |
| LiveBench browser | 89.8% | Not measured | Only Claude Fable 5.1 measured |
| LiveBench long agentic | 74.2% | Not measured | Only Claude Fable 5.1 measured |
| SREBench (Vals AI) | 22.9% | Not measured | Only Claude Fable 5.1 measured |
| Finance Agent (Vals AI) | 58.9% | Not measured | Only Claude Fable 5.1 measured |
| Tax Agent Bench (Vals AI) | 50.7% | 38.2% | Claude Fable 5.1 |
| Legal Research Bench (Vals AI) | 55.3% | 49.0% | Claude Fable 5.1 |
| Harvey's Legal Agent Benchmark (Vals AI) | Not measured | 25.0% | Only Muse Ember measured |
| Excel Modeling Benchmark (Vals AI) | 76.7% | Not measured | Only Claude Fable 5.1 measured |
| Terminal-Bench-Science (Vals AI) | 40.0% | Not measured | Only Claude Fable 5.1 measured |
| Time Horizon Index (Vals AI) | 63.3% | Not measured | Only Claude Fable 5.1 measured |
| CUA-bench (Vals AI) | 13.2% | Not measured | Only Claude Fable 5.1 measured |
| Robo-bench (Vals AI) | 5.8% | Not measured | Only Claude Fable 5.1 measured |
| APEX-Agents | 68.6% | 64.3% | Claude Fable 5.1 |
| Remote Labor Index | 17.9% | Not measured | Only Claude Fable 5.1 measured |
| PostTrainBench | 44.6% | Not measured | Only Claude Fable 5.1 measured |
| SpireClimb | 2.0% | Not measured | Only Claude Fable 5.1 measured |
| Vending-Bench 2 | $5,422 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Search | 1237 | Not measured | Only Claude Fable 5.1 measured |
| MCP Atlas | 87.2% | Not measured | Only Claude Fable 5.1 measured |
| Neither model has a result on the other 16 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Claude Fable 5.1 | Muse Ember | Leader |
|---|---|---|---|
| GPQA Diamond | 93.4% | Not measured | Only Claude Fable 5.1 measured |
| LiveBench reasoning | 91.7% | Not measured | Only Claude Fable 5.1 measured |
| MysteryMechanism (Vals AI) | 47.8% | Not measured | Only Claude Fable 5.1 measured |
| MMMU Pro (Vals AI) | 90.6% | Not measured | Only Claude Fable 5.1 measured |
| GPQA Diamond (Artificial Analysis run) | 93.7% | Not measured | Only Claude Fable 5.1 measured |
| Humanity's Last Exam (Artificial Analysis run) | 59.1% | Not measured | Only Claude Fable 5.1 measured |
| HLE-Diamond (Artificial Analysis run) | 60.1% | 25.1% | Claude Fable 5.1 |
| CritPt v2, hard subset (Artificial Analysis run) | 62.0% | 39.0% | Claude Fable 5.1 |
| ARC-AGI | 97.5% | Not measured | Only Claude Fable 5.1 measured |
| ARC-AGI-2 | 90.0% | Not measured | Only Claude Fable 5.1 measured |
| SimpleBench | 86.6% | Not measured | Only Claude Fable 5.1 measured |
| Chess puzzles | 48.0% | Not measured | Only Claude Fable 5.1 measured |
| Mystery game puzzles | 58.0% | Not measured | Only Claude Fable 5.1 measured |
| EBR-bench | 57.1% | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: hard prompts | 1527 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: expert | 1546 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: hard prompts in English | 1522 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Vision: diagrams | 1346 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Vision: homework | 1339 | Not measured | Only Claude Fable 5.1 measured |
| Humanity's Last Exam (Scale run) | 51.3% | Not measured | Only Claude Fable 5.1 measured |
| GoBench | 2268 | Not measured | Only Claude Fable 5.1 measured |
| Neither model has a result on the other 5 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index7 boards, none shared
| Benchmark | Claude Fable 5.1 | Muse Ember | Leader |
|---|---|---|---|
| OTIS Mock AIME | 100.0% | Not measured | Only Claude Fable 5.1 measured |
| FrontierMath, tiers 1 to 3 | 90.2% | Not measured | Only Claude Fable 5.1 measured |
| FrontierMath, tier 4 | 87.8% | Not measured | Only Claude Fable 5.1 measured |
| ProofBench | 100.0% | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: math | 1530 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: mathematical work | 1542 | Not measured | Only Claude Fable 5.1 measured |
| MathArena | 73.6% | Not measured | Only Claude Fable 5.1 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 5.1 | Muse Ember | Leader |
|---|---|---|---|
| MMLU Pro | 92.4% | Not measured | Only Claude Fable 5.1 measured |
| LegalBench (Vals AI) | 88.5% | Not measured | Only Claude Fable 5.1 measured |
| TaxEval (Vals AI) | 76.0% | Not measured | Only Claude Fable 5.1 measured |
| MortgageTax (Vals AI) | 70.8% | Not measured | Only Claude Fable 5.1 measured |
| MedCode (Vals AI) | 53.5% | Not measured | Only Claude Fable 5.1 measured |
| AA-Omniscience | 46.3 | 7.7 | Claude Fable 5.1 |
| SimpleQA Verified | 70.8% | Not measured | Only Claude Fable 5.1 measured |
| GeoBench | 84.0% | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: science | 1535 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: medicine and healthcare | 1529 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: legal and government | 1516 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: business and finance | 1494 | Not measured | Only Claude Fable 5.1 measured |
| PRBench Finance | 50.8% | Not measured | Only Claude Fable 5.1 measured |
| PRBench Legal | 51.6% | Not measured | Only Claude Fable 5.1 measured |
| Neither model has a result on the other 7 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
| Benchmark | Claude Fable 5.1 | Muse Ember | Leader |
|---|---|---|---|
| Design Arena: websites | 1305 | Not measured | Only Claude Fable 5.1 measured |
| Design Arena: UI components | 1332 | Not measured | Only Claude Fable 5.1 measured |
| Design Arena: game dev | 1364 | Not measured | Only Claude Fable 5.1 measured |
| Design Arena: data viz | 1345 | Not measured | Only Claude Fable 5.1 measured |
| Design Arena: 3D | 1387 | Not measured | Only Claude Fable 5.1 measured |
| Design Arena: all code categories | 1330 | Not measured | Only Claude Fable 5.1 measured |
| Design Arena: SVG | 1292 | Not measured | Only Claude Fable 5.1 measured |
| Design Arena: ASCII art | 1318 | Not measured | Only Claude Fable 5.1 measured |
| LiveBench design | 81.6% | Not measured | Only Claude Fable 5.1 measured |
GeneralDirectional onlyPublic boards, shown as published, kept out of the index33 boards, none shared
| Benchmark | Claude Fable 5.1 | Muse Ember | Leader |
|---|---|---|---|
| Vals Index | Not measured | 60.5% | Only Muse Ember measured |
| LiveBench data analysis | 80.3% | Not measured | Only Claude Fable 5.1 measured |
| Public Benefits Bench (Vals AI) | 74.9% | Not measured | Only Claude Fable 5.1 measured |
| MedScribe (Vals AI) | 91.3% | Not measured | Only Claude Fable 5.1 measured |
| Long context reasoning (AA-LCR) | 85.3% | Not measured | Only Claude Fable 5.1 measured |
| GDPval-AA | 1765 | Not measured | Only Claude Fable 5.1 measured |
| DTBench | 97.6% | Not measured | Only Claude Fable 5.1 measured |
| LMCA | 65.5% | Not measured | Only Claude Fable 5.1 measured |
| Furniture assembly | 70.0% | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text | 1512 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: instruction following | 1520 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: creative writing | 1514 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Vision | 1322 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: English | 1507 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: non-English | 1507 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: Chinese | 1582 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: German | 1503 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: Japanese | 1560 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: Korean | 1505 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: French | 1515 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: Spanish | 1510 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: Russian | 1518 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: Polish | 1537 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: multi-turn | 1492 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: longer queries | 1523 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: writing and language | 1515 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Text: entertainment and media | 1498 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Vision: English | 1316 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Vision: Chinese | 1397 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Vision: reading text | 1329 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Vision: humor | 1326 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Vision: creative writing | 1325 | Not measured | Only Claude Fable 5.1 measured |
| LMArena Document | 1515 | Not measured | Only Claude Fable 5.1 measured |
| Neither model has a result on the other 16 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Fable 5.1 | Muse Ember | 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 5.1$0.035Fits in one request
Muse Ember$0.0003Fits in one request
Muse Ember costs less
Repository review
50K input + 3K output tokens
Claude Fable 5.1$0.650Fits in one request
Muse Ember$0.0065Fits in one request
Muse Ember costs less
Agent loop
200K input + 10K output tokens
Claude Fable 5.1$2.50Fits in one request
Muse Ember$0.025Fits in one request
Muse Ember 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 5.1 | Meta Muse Ember |
|---|---|---|
| Maker | Anthropic | Meta |
| Weights | No public weights listed | No public weights listed |
| Released | September 1, 2026 | November 9, 2026 |
| Context window | 1M | 1.05M |
| Input $/Mtok | $10.00 | $0.10 |
| Output $/Mtok | $50.00 | $0.50 |
| Coding index | 82.8 | 64.9 |
| Independent measurements behind it | 5 | 3 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Fable 5.1 better than Muse Ember for coding?
Pick Claude Fable 5.1 for coding: it scores 82.8 on the Vibe Coding Index against 64.9 for Muse Ember. Pick Muse Ember for output tokens 100.0x cheaper ($0.50 vs $50.00 per million) and a larger context window (1.05M against 1M tokens).
Which is cheaper, Claude Fable 5.1 or Muse Ember?
Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; Muse Ember costs $0.10 and $0.50. Cost per solved task is known for neither of them.
Which has the bigger context window, Claude Fable 5.1 or Muse Ember?
Muse Ember, with 1.05M tokens against 1M.
How many benchmarks is the Claude Fable 5.1 vs Muse Ember comparison based on?
13 benchmarks have a result for both models as of November 14, 2026. Claude Fable 5.1's coding index rests on 5 independent benchmarks and Muse Ember's on 3. Where only one model has a result, the page says so instead of naming a winner.