Claude Sonnet 5 vs Muse Ember
Muse Ember leads Claude Sonnet 5 on coding, 64.9 to 54.6 on the Vibe Coding Index, and Muse Ember costs 20.0x less per output token ($0.50 vs $10.00 per million). Updated November 14, 2026; 10 benchmarks have a result for both.
vs boards won of 10 shared
Claude Sonnet 5 or Muse Ember: which to pick
Pick Muse Ember for coding: it scores 64.9 on the Vibe Coding Index against 54.6 for Claude Sonnet 5, though on 3 benchmarks against 5.
Claude Sonnet 5 is neither cheaper nor larger in context, and leads no benchmark both models were measured on.
Model AClaude Sonnet 5Anthropic54.6/1005 independent benchmarks$1.87 per solved taskModel BMuse EmberMeta64.9/1003 independent benchmarksNo cost per solved task
- Shared results
- 10
- Claude Sonnet 5 only
- 116
- Muse Ember only
- 5
- Like-for-like categories
- 2 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
Muse Ember
Muse Ember scores 64.9 against 54.6.
5 and 3 benchmarks behind the scores
Agentic work
AA Agentic Index
No call
Only Claude Sonnet 5 has a AA Agentic Index result, 43.6.
Directional only
Reasoning
GPQA Diamond
No call
Only Claude Sonnet 5 has a GPQA Diamond result, 88.9%.
Directional only
Knowledge
MMLU Pro
No call
Only Claude Sonnet 5 has a MMLU Pro result, 87.5%.
Directional only
Web design
Design Arena: websites
No call
Only Claude Sonnet 5 has a Design Arena: websites result, 1268.
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 Sonnet 5 $0.0070, Muse Ember $0.0003 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Claude Sonnet 5 has the number, $1.87.
Directional only
At a glance
- Coding index
- Claude Sonnet 5 54.6 from 5 benchmarks, Muse Ember 64.9 from 3 benchmarks.
- Widest category
- Coding, 15.6 points apart on average over 7 shared benchmarks.
- Widest single gap
- Terminal-Bench 4 (Vals AI): Claude Sonnet 5 10.6% against Muse Ember 39.4%, 38.4 points apart on a 0 to 100 scale.
- Output price
- Claude Sonnet 5 $10.00 against Muse Ember $0.50 per million output tokens, 20.0x apart.
- Context window
- Claude Sonnet 5 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 Sonnet 5 | Bars | Muse Ember | Ties |
|---|---|---|---|---|
| Coding | 0 | 7 | ||
| Agentic work | 0 | 3 | ||
| All shared boards | 0 | 10 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index07
| Benchmark | Claude Sonnet 5 | Muse Ember | Leader |
|---|---|---|---|
| LMArena WebDev | 1539 | 1609 | Muse Ember |
| AA Coding Index | 71.5 | Not measured | Only Claude Sonnet 5 measured |
| LiveCodeBench (Vals AI) | 82.4% | Not measured | Only Claude Sonnet 5 measured |
| SWE-bench Verified (Vals AI) | 79.6% | Not measured | Only Claude Sonnet 5 measured |
| Terminal-Bench 4 (Vals AI) | 10.6% | 39.4% | Muse Ember |
| Vibe Code Bench (Vals AI) | 81.3% | 83.7% | Muse Ember |
| Code migration (Vals AI) | 44.4% | Not measured | Only Claude Sonnet 5 measured |
| ProgramBench (Vals AI) | 0.0% | Not measured | Only Claude Sonnet 5 measured |
| IOI (Vals AI) | 45.0% | Not measured | Only Claude Sonnet 5 measured |
| Terminal-Bench 2.1 (Vals AI) | 74.5% | Not measured | Only Claude Sonnet 5 measured |
| Vibe Code Bench 1-100 (Vals AI) | 13.8% | Not measured | Only Claude Sonnet 5 measured |
| SkillsBench (Vals AI) | 46.5% | Not measured | Only Claude Sonnet 5 measured |
| CyberBench (Vals AI) | 70.3% | Not measured | Only Claude Sonnet 5 measured |
| SciCode | 54.3% | Not measured | Only Claude Sonnet 5 measured |
| Terminal-Bench 4.0 (Artificial Analysis run) | 14.1% | 40.9% | Muse Ember |
| FrontierCode 2.0 | 17.8% | 27.2% | Muse Ember |
| FrontierCode | 42.7% | Not measured | Only Claude Sonnet 5 measured |
| GSO-Bench | 37.3% | Not measured | Only Claude Sonnet 5 measured |
| WeirdML | 68.8% | Not measured | Only Claude Sonnet 5 measured |
| MirrorCode | 63.3% | Not measured | Only Claude Sonnet 5 measured |
| ALE-Bench | 1463.1 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: coding | 1483 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: software and IT | 1474 | Not measured | Only Claude Sonnet 5 measured |
| LMArena WebDev: React | 1539 | 1616 | Muse Ember |
| LMArena WebDev: HTML | 1525 | 1621 | Muse Ember |
| LMArena WebDev: from an image | 1539 | Not measured | Only Claude Sonnet 5 measured |
| SciCode | 10.7% | Not measured | Only Claude Sonnet 5 measured |
| SWE-Bench Pro V2 | 93.2% | Not measured | Only Claude Sonnet 5 measured |
| GameBench 2 | 54.4 | Not measured | Only Claude Sonnet 5 measured |
| Terminal-Bench 2.1 | 74.6% | Not measured | Only Claude Sonnet 5 measured |
| Terminal-Bench 3.0 | 14.6% | Not measured | Only Claude Sonnet 5 measured |
| Terminal-Bench 4.0 | 12.4% | Not measured | Only Claude Sonnet 5 measured |
| CursorBench 4.0 | 34.1% | Not measured | Only Claude Sonnet 5 measured |
| Neither model has a result on the other 19 boards here | |||
IntelligenceDirectional onlyPublic boards, shown as published, kept out of the index1 board, none shared
| Benchmark | Claude Sonnet 5 | Muse Ember | Leader |
|---|---|---|---|
| Epoch Capabilities Index | 156.9 | Not measured | Only Claude Sonnet 5 measured |
| Neither model has a result on the other 1 board here | |||
Agentic workLike-for-likePublic boards, shown as published, kept out of the index03
| Benchmark | Claude Sonnet 5 | Muse Ember | Leader |
|---|---|---|---|
| AA Agentic Index | 43.6 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: agents building web apps | 1217 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: agents building full-stack apps | 1224 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: agents building mobile apps | 1202 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: agents building Android apps | 1212 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: agents building Godot games | 1202 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: agents building games | 1166 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: HTML slides | 1112 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: PowerPoint slides | 1180 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: spreadsheets | 1047 | Not measured | Only Claude Sonnet 5 measured |
| SREBench (Vals AI) | 0.4% | Not measured | Only Claude Sonnet 5 measured |
| Finance Agent (Vals AI) | 53.9% | Not measured | Only Claude Sonnet 5 measured |
| Tax Agent Bench (Vals AI) | 29.4% | 38.2% | Muse Ember |
| Legal Research Bench (Vals AI) | 41.8% | 49.0% | Muse Ember |
| Harvey's Legal Agent Benchmark (Vals AI) | Not measured | 25.0% | Only Muse Ember measured |
| Excel Modeling Benchmark (Vals AI) | 66.3% | Not measured | Only Claude Sonnet 5 measured |
| Terminal-Bench-Science (Vals AI) | 5.7% | Not measured | Only Claude Sonnet 5 measured |
| APEX-Agents | 54.5% | 64.3% | Muse Ember |
| Vending-Bench 2 | $6,378 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Search | 1188 | Not measured | Only Claude Sonnet 5 measured |
| Toolathlon-Verified | 71.6% | Not measured | Only Claude Sonnet 5 measured |
| Neither model has a result on the other 23 boards here | |||
ReasoningDirectional onlyPublic boards, shown as published, kept out of the index15 boards, none shared
| Benchmark | Claude Sonnet 5 | Muse Ember | Leader |
|---|---|---|---|
| GPQA Diamond | 88.9% | Not measured | Only Claude Sonnet 5 measured |
| MMMU Pro (Vals AI) | 83.0% | Not measured | Only Claude Sonnet 5 measured |
| GPQA Diamond (Artificial Analysis run) | 91.1% | Not measured | Only Claude Sonnet 5 measured |
| Humanity's Last Exam (Artificial Analysis run) | 41.3% | Not measured | Only Claude Sonnet 5 measured |
| HLE-Diamond (Artificial Analysis run) | Not measured | 25.1% | Only Muse Ember measured |
| CritPt v2, hard subset (Artificial Analysis run) | Not measured | 39.0% | Only Muse Ember measured |
| GPQA Diamond (Epoch AI run) | 90.5% | Not measured | Only Claude Sonnet 5 measured |
| SimpleBench | 60.6% | Not measured | Only Claude Sonnet 5 measured |
| Chess puzzles | 45.0% | Not measured | Only Claude Sonnet 5 measured |
| Mystery game puzzles | 35.0% | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: hard prompts | 1461 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: expert | 1488 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: hard prompts in English | 1465 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Vision: diagrams | 1292 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Vision: homework | 1310 | Not measured | Only Claude Sonnet 5 measured |
| Neither model has a result on the other 11 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index6 boards, none shared
| Benchmark | Claude Sonnet 5 | Muse Ember | Leader |
|---|---|---|---|
| OTIS Mock AIME | 94.7% | Not measured | Only Claude Sonnet 5 measured |
| FrontierMath, tiers 1 to 3 | 65.6% | Not measured | Only Claude Sonnet 5 measured |
| FrontierMath, tier 4 | 29.3% | Not measured | Only Claude Sonnet 5 measured |
| ProofBench | 77.0% | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: math | 1467 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: mathematical work | 1479 | Not measured | Only Claude Sonnet 5 measured |
| Neither model has a result on the other 8 boards here | |||
KnowledgeDirectional onlyPublic boards, shown as published, kept out of the index13 boards, none shared
| Benchmark | Claude Sonnet 5 | Muse Ember | Leader |
|---|---|---|---|
| MMLU Pro | 87.5% | Not measured | Only Claude Sonnet 5 measured |
| LegalBench (Vals AI) | 83.9% | Not measured | Only Claude Sonnet 5 measured |
| CorpFin (Vals AI) | 67.0% | Not measured | Only Claude Sonnet 5 measured |
| TaxEval (Vals AI) | 75.6% | Not measured | Only Claude Sonnet 5 measured |
| MortgageTax (Vals AI) | 70.0% | Not measured | Only Claude Sonnet 5 measured |
| MedCode (Vals AI) | 47.5% | Not measured | Only Claude Sonnet 5 measured |
| AA-Omniscience | Not measured | 7.7 | Only Muse Ember measured |
| SimpleQA Verified | 33.7% | Not measured | Only Claude Sonnet 5 measured |
| GeoBench | 74.0% | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: science | 1460 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: medicine and healthcare | 1443 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: legal and government | 1451 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: business and finance | 1437 | Not measured | Only Claude Sonnet 5 measured |
| Neither model has a result on the other 8 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
| Benchmark | Claude Sonnet 5 | Muse Ember | Leader |
|---|---|---|---|
| Design Arena: websites | 1268 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: UI components | 1267 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: game dev | 1271 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: data viz | 1247 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: 3D | 1236 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: all code categories | 1267 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: SVG | 1184 | Not measured | Only Claude Sonnet 5 measured |
| Design Arena: ASCII art | 1199 | Not measured | Only Claude Sonnet 5 measured |
| Neither model has a result on the other 1 board here | |||
GeneralDirectional onlyPublic boards, shown as published, kept out of the index34 boards, none shared
| Benchmark | Claude Sonnet 5 | Muse Ember | Leader |
|---|---|---|---|
| Vals Index | Not measured | 60.5% | Only Muse Ember measured |
| Public Benefits Bench (Vals AI) | 66.0% | Not measured | Only Claude Sonnet 5 measured |
| MedScribe (Vals AI) | 76.0% | Not measured | Only Claude Sonnet 5 measured |
| Vals Multimodal Index | 68.8% | Not measured | Only Claude Sonnet 5 measured |
| Long context reasoning (AA-LCR) | 82.0% | Not measured | Only Claude Sonnet 5 measured |
| GDPval-AA | 1470 | Not measured | Only Claude Sonnet 5 measured |
| DTBench | 92.5% | Not measured | Only Claude Sonnet 5 measured |
| LMCA | 50.0% | Not measured | Only Claude Sonnet 5 measured |
| Surface Evolver Bench | 60.0% | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text | 1442 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: instruction following | 1453 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: creative writing | 1414 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Vision | 1272 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: English | 1450 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: non-English | 1431 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: Chinese | 1477 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: German | 1441 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: Japanese | 1420 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: Korean | 1400 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: French | 1463 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: Spanish | 1441 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: Russian | 1448 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: Polish | 1428 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: multi-turn | 1454 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: longer queries | 1462 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: writing and language | 1435 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Text: entertainment and media | 1411 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Vision: English | 1273 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Vision: Chinese | 1334 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Vision: reading text | 1286 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Vision: humor | 1257 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Vision: creative writing | 1247 | Not measured | Only Claude Sonnet 5 measured |
| LMArena Document | 1460 | Not measured | Only Claude Sonnet 5 measured |
| EQ-Bench 4 | 1221 | Not measured | Only Claude Sonnet 5 measured |
| Neither model has a result on the other 15 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Claude Sonnet 5 | 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 Sonnet 5$0.0070Fits in one request
Muse Ember$0.0003Fits in one request
Muse Ember costs less
Repository review
50K input + 3K output tokens
Claude Sonnet 5$0.130Fits in one request
Muse Ember$0.0065Fits in one request
Muse Ember costs less
Agent loop
200K input + 10K output tokens
Claude Sonnet 5$0.500Fits 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 Sonnet 5 | Meta Muse Ember |
|---|---|---|
| Maker | Anthropic | Meta |
| Weights | No public weights listed | No public weights listed |
| Released | June 30, 2026 | November 9, 2026 |
| Context window | 1M | 1.05M |
| Input $/Mtok | $2.00 | $0.10 |
| Output $/Mtok | $10.00 | $0.50 |
| Coding index | 54.6 | 64.9 |
| Independent measurements behind it | 5 | 3 |
| Cost per solved task | $1.87 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Sonnet 5 better than Muse Ember for coding?
Pick Muse Ember for coding: it scores 64.9 on the Vibe Coding Index against 54.6 for Claude Sonnet 5, though on 3 benchmarks against 5. Claude Sonnet 5 is neither cheaper nor larger in context, and leads no benchmark both models were measured on.
Which is cheaper, Claude Sonnet 5 or Muse Ember?
Claude Sonnet 5 costs $2.00 per million input tokens and $10.00 per million output tokens; Muse Ember costs $0.10 and $0.50. Cost per solved task is known for Claude Sonnet 5 only.
Which has the bigger context window, Claude Sonnet 5 or Muse Ember?
Muse Ember, with 1.05M tokens against 1M.
How many benchmarks is the Claude Sonnet 5 vs Muse Ember comparison based on?
10 benchmarks have a result for both models as of November 14, 2026. Claude Sonnet 5'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.