Claude Sonnet 4.6 vs Muse Spark Open
Claude Sonnet 4.6 leads Muse Spark Open on coding, 57.3 to 47.4 on the Vibe Coding Index, and Muse Spark Open costs 3.5x less per output token ($4.25 vs $15.00 per million). Updated October 22, 2026; 24 benchmarks have a result for both.
Claude Sonnet 4.6 or Muse Spark Open: which to pick
Pick Claude Sonnet 4.6 for coding: it scores 57.3 on the Vibe Coding Index against 47.4 for Muse Spark Open.
Pick Muse Spark Open for output tokens 3.5x cheaper ($4.25 vs $15.00 per million) and a larger context window (1.05M against 1M tokens).
- Shared results
- 24
- Claude Sonnet 4.6 only
- 94
- Muse Spark Open only
- 4
- Like-for-like categories
- 6 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 Sonnet 4.6
Claude Sonnet 4.6 scores 57.3 against 47.4.
5 and 4 benchmarks behind the scores
Intelligence
AA Intelligence Index
No call
Only Claude Sonnet 4.6 has a AA Intelligence Index result, 30.1.
Directional only
Agentic work
AA Agentic Index
No call
Only Claude Sonnet 4.6 has a AA Agentic Index result, 31.8.
Directional only
Reasoning
GPQA Diamond
No call
Only Claude Sonnet 4.6 has a GPQA Diamond result, 85.6%.
Directional only
Math
AIME
No call
Only Claude Sonnet 4.6 has a AIME result, 92.3%.
Directional only
Knowledge
MMLU Pro
No call
Only Claude Sonnet 4.6 has a MMLU Pro result, 87.3%.
Directional only
Web design
Design Arena: websites
Muse Spark Open
Muse Spark Open leads, 1310 against 1284.
Same board, both measured
General
Vals Index
No call
Only Muse Spark Open has a Vals Index result, 48.6%.
Directional only
Long documents
Listed context window
Muse Spark Open
Muse Spark Open takes 1.05M tokens against 1M.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
Muse Spark Open
Claude Sonnet 4.6 $0.011, Muse Spark Open $0.0034 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Claude Sonnet 4.6 has the number, $1.68.
Directional only
At a glance
- Coding index
- Claude Sonnet 4.6 57.3 from 5 benchmarks, Muse Spark Open 47.4 from 4 benchmarks.
- Widest category
- Agentic work, 10.0 points apart on average over 8 shared benchmarks.
- Widest single gap
- LiveBench browser: Claude Sonnet 4.6 68.0% against Muse Spark Open 36.0%, 32.0 points apart on a 0 to 100 scale.
- Output price
- Claude Sonnet 4.6 $15.00 against Muse Spark Open $4.25 per million output tokens, 3.5x apart.
- Context window
- Claude Sonnet 4.6 takes 1M tokens, Muse Spark Open 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 4.6 | Bars | Muse Spark Open | Ties |
|---|---|---|---|---|
| Coding | 2 | 5 | ||
| Intelligence | 0 | 1 | ||
| Agentic work | 4 | 3 | 1 tie | |
| Reasoning | 1 | 2 | ||
| Web design | 1 | 2 | ||
| General | 2 | 0 | ||
| All shared boards | 10 | 13 | 1 tie |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index25
| Benchmark | Claude Sonnet 4.6 | Muse Spark Open | Leader |
|---|---|---|---|
| LiveBench coding | 66.6% | 73.6% | Muse Spark Open |
| LMArena WebDev | 1523 | 1528 | Muse Spark Open |
| AA Coding Index | 63.0 | Not measured | Only Claude Sonnet 4.6 measured |
| LiveCodeBench (Vals AI) | 82.1% | Not measured | Only Claude Sonnet 4.6 measured |
| SWE-bench Verified (Vals AI) | 77.4% | Not measured | Only Claude Sonnet 4.6 measured |
| Terminal-Bench 4 (Vals AI) | Not measured | 6.6% | Only Muse Spark Open measured |
| Vibe Code Bench (Vals AI) | 55.8% | 76.2% | Muse Spark Open |
| Code migration (Vals AI) | 39.9% | 21.2% | Claude Sonnet 4.6 |
| ProgramBench (Vals AI) | 0.5% | Not measured | Only Claude Sonnet 4.6 measured |
| Terminal-Bench 2.1 (Vals AI) | 57.3% | Not measured | Only Claude Sonnet 4.6 measured |
| SkillsBench (Vals AI) | 49.0% | Not measured | Only Claude Sonnet 4.6 measured |
| SciCode | 50.1% | 58.4% | Muse Spark Open |
| Terminal-Bench Hard (Artificial Analysis run) | 53.0% | Not measured | Only Claude Sonnet 4.6 measured |
| Terminal-Bench | 53.4% | Not measured | Only Claude Sonnet 4.6 measured |
| FrontierCode | 24.3% | Not measured | Only Claude Sonnet 4.6 measured |
| WeirdML | 66.1% | Not measured | Only Claude Sonnet 4.6 measured |
| ALE-Bench | Not measured | 1590.1 | Only Muse Spark Open measured |
| LMArena Text: coding | 1503 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: software and IT | 1491 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena WebDev: React | 1512 | 1529 | Muse Spark Open |
| LMArena WebDev: HTML | 1527 | 1495 | Claude Sonnet 4.6 |
| LMArena WebDev: from an image | 1529 | Not measured | Only Claude Sonnet 4.6 measured |
| Neither model has a result on the other 17 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | Claude Sonnet 4.6 | Muse Spark Open | Leader |
|---|---|---|---|
| AA Intelligence Index | 30.1 | Not measured | Only Claude Sonnet 4.6 measured |
| Epoch Capabilities Index | 152.8 | 155.1 | Muse Spark Open |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index43
| Benchmark | Claude Sonnet 4.6 | Muse Spark Open | Leader |
|---|---|---|---|
| AA Agentic Index | 31.8 | Not measured | Only Claude Sonnet 4.6 measured |
| Design Arena: agents building web apps | 1190 | Not measured | Only Claude Sonnet 4.6 measured |
| Design Arena: agents building full-stack apps | 1213 | Not measured | Only Claude Sonnet 4.6 measured |
| Design Arena: agents building mobile apps | 1212 | Not measured | Only Claude Sonnet 4.6 measured |
| Design Arena: agents building Android apps | 1197 | Not measured | Only Claude Sonnet 4.6 measured |
| Design Arena: agents building Godot games | 1226 | Not measured | Only Claude Sonnet 4.6 measured |
| Design Arena: agents building games | 1177 | Not measured | Only Claude Sonnet 4.6 measured |
| LiveBench research | 63.6% | 80.3% | Muse Spark Open |
| LiveBench browser | 68.0% | 36.0% | Claude Sonnet 4.6 |
| LiveBench long agentic | 23.1% | 18.9% | Claude Sonnet 4.6 |
| Finance Agent (Vals AI) | 51.0% | 61.3% | Muse Spark Open |
| Tax Agent Bench (Vals AI) | 25.8% | 26.3% | Muse Spark Open |
| Legal Research Bench (Vals AI) | 38.5% | 38.5% | Tie |
| Harvey's Legal Agent Benchmark (Vals AI) | Not measured | 25.0% | Only Muse Spark Open measured |
| Excel Modeling Benchmark (Vals AI) | 60.2% | 53.7% | Claude Sonnet 4.6 |
| τ²-Bench Telecom | 79.5% | Not measured | Only Claude Sonnet 4.6 measured |
| APEX-Agents | 43.0% | 33.4% | Claude Sonnet 4.6 |
| OSWorld 2.0 | 9.3% | Not measured | Only Claude Sonnet 4.6 measured |
| DeepResearch Bench | 54.9% | Not measured | Only Claude Sonnet 4.6 measured |
| OSWorld | 72.1% | Not measured | Only Claude Sonnet 4.6 measured |
| Vending-Bench 2 | $7,204 | Not measured | Only Claude Sonnet 4.6 measured |
| Neither model has a result on the other 20 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index12
| Benchmark | Claude Sonnet 4.6 | Muse Spark Open | Leader |
|---|---|---|---|
| GPQA Diamond | 85.6% | Not measured | Only Claude Sonnet 4.6 measured |
| LiveBench reasoning | 86.4% | 73.7% | Claude Sonnet 4.6 |
| MMMU Pro (Vals AI) | 83.6% | Not measured | Only Claude Sonnet 4.6 measured |
| GPQA Diamond (Artificial Analysis run) | 87.5% | 89.0% | Muse Spark Open |
| Humanity's Last Exam (Artificial Analysis run) | 33.6% | 43.9% | Muse Spark Open |
| GPQA Diamond (Epoch AI run) | 87.4% | Not measured | Only Claude Sonnet 4.6 measured |
| ARC-AGI | 86.5% | Not measured | Only Claude Sonnet 4.6 measured |
| ARC-AGI-2 | 60.4% | Not measured | Only Claude Sonnet 4.6 measured |
| Chess puzzles | 23.0% | Not measured | Only Claude Sonnet 4.6 measured |
| Mystery game puzzles | 16.0% | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: hard prompts | 1485 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: expert | 1500 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: hard prompts in English | 1493 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Vision: diagrams | 1306 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Vision: homework | 1311 | Not measured | Only Claude Sonnet 4.6 measured |
| Neither model has a result on the other 7 boards here | |||
MathDirectional onlyPublic boards, shown as published, kept out of the index5 boards, none shared
| Benchmark | Claude Sonnet 4.6 | Muse Spark Open | Leader |
|---|---|---|---|
| AIME | 92.3% | Not measured | Only Claude Sonnet 4.6 measured |
| OTIS Mock AIME | 85.8% | Not measured | Only Claude Sonnet 4.6 measured |
| ProofBench | 45.0% | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: math | 1462 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: mathematical work | 1483 | Not measured | Only Claude Sonnet 4.6 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 4.6 | Muse Spark Open | Leader |
|---|---|---|---|
| MMLU Pro | 87.3% | Not measured | Only Claude Sonnet 4.6 measured |
| LegalBench (Vals AI) | 82.1% | Not measured | Only Claude Sonnet 4.6 measured |
| CaseLaw (Vals AI) | 64.0% | Not measured | Only Claude Sonnet 4.6 measured |
| CorpFin (Vals AI) | 65.3% | Not measured | Only Claude Sonnet 4.6 measured |
| TaxEval (Vals AI) | 77.1% | Not measured | Only Claude Sonnet 4.6 measured |
| MortgageTax (Vals AI) | 67.7% | Not measured | Only Claude Sonnet 4.6 measured |
| MedQA (Vals AI) | 92.1% | Not measured | Only Claude Sonnet 4.6 measured |
| SimpleQA Verified | 35.5% | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: science | 1474 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: medicine and healthcare | 1451 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: legal and government | 1470 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: business and finance | 1464 | Not measured | Only Claude Sonnet 4.6 measured |
| FACTS Benchmark Suite | 37.0% | Not measured | Only Claude Sonnet 4.6 measured |
| Neither model has a result on the other 5 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index12
| Benchmark | Claude Sonnet 4.6 | Muse Spark Open | Leader |
|---|---|---|---|
| Design Arena: websites | 1284 | 1310 | Muse Spark Open |
| Design Arena: UI components | 1269 | Not measured | Only Claude Sonnet 4.6 measured |
| Design Arena: game dev | 1258 | 1282 | Muse Spark Open |
| Design Arena: data viz | 1278 | Not measured | Only Claude Sonnet 4.6 measured |
| Design Arena: 3D | 1234 | Not measured | Only Claude Sonnet 4.6 measured |
| Design Arena: all code categories | 1275 | Not measured | Only Claude Sonnet 4.6 measured |
| Design Arena: SVG | 1196 | Not measured | Only Claude Sonnet 4.6 measured |
| Design Arena: ASCII art | 1235 | Not measured | Only Claude Sonnet 4.6 measured |
| LiveBench design | 71.8% | 60.3% | Claude Sonnet 4.6 |
GeneralLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Claude Sonnet 4.6 | Muse Spark Open | Leader |
|---|---|---|---|
| Vals Index | Not measured | 48.6% | Only Muse Spark Open measured |
| LiveBench data analysis | 76.1% | 60.2% | Claude Sonnet 4.6 |
| Public Benefits Bench (Vals AI) | 62.5% | Not measured | Only Claude Sonnet 4.6 measured |
| SAGE (Vals AI) | 46.6% | Not measured | Only Claude Sonnet 4.6 measured |
| Vals Multimodal Index | 60.6% | Not measured | Only Claude Sonnet 4.6 measured |
| IFBench | 56.6% | Not measured | Only Claude Sonnet 4.6 measured |
| Long context reasoning (AA-LCR) | 80.0% | 78.3% | Claude Sonnet 4.6 |
| DTBench | 89.9% | Not measured | Only Claude Sonnet 4.6 measured |
| LMCA | 46.5% | Not measured | Only Claude Sonnet 4.6 measured |
| ExploitBench | 23.6% | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text | 1458 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: instruction following | 1476 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: creative writing | 1435 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Vision | 1283 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: English | 1472 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: non-English | 1440 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: Chinese | 1491 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: German | 1428 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: Japanese | 1420 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: Korean | 1410 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: French | 1465 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: Spanish | 1464 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: Russian | 1440 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: Polish | 1443 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: multi-turn | 1464 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: longer queries | 1479 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: writing and language | 1444 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Text: entertainment and media | 1431 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Vision: English | 1298 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Vision: Chinese | 1307 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Vision: reading text | 1296 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Vision: humor | 1248 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Vision: recognizing things | 1195 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Vision: creative writing | 1272 | Not measured | Only Claude Sonnet 4.6 measured |
| LMArena Document | 1482 | Not measured | Only Claude Sonnet 4.6 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
| Benchmark | Claude Sonnet 4.6 | Muse Spark Open | 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
Muse Spark Open costs less
Repository review
50K input + 3K output tokens
Muse Spark Open costs less
Agent loop
200K input + 10K output tokens
Muse Spark Open 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 4.6 | Meta Muse Spark Open |
|---|---|---|
| Maker | Anthropic | Meta |
| Weights | No public weights listed | Open weights |
| Released | February 17, 2026 | October 15, 2026 |
| Context window | 1M | 1.05M |
| Input $/Mtok | $3.00 | $1.25 |
| Output $/Mtok | $15.00 | $4.25 |
| Coding index | 57.3 | 47.4 |
| Independent measurements behind it | 5 | 4 |
| Cost per solved task | $1.68 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Sonnet 4.6 better than Muse Spark Open for coding?
Pick Claude Sonnet 4.6 for coding: it scores 57.3 on the Vibe Coding Index against 47.4 for Muse Spark Open. Pick Muse Spark Open for output tokens 3.5x cheaper ($4.25 vs $15.00 per million) and a larger context window (1.05M against 1M tokens).
Which is cheaper, Claude Sonnet 4.6 or Muse Spark Open?
Claude Sonnet 4.6 costs $3.00 per million input tokens and $15.00 per million output tokens; Muse Spark Open costs $1.25 and $4.25. Cost per solved task is known for Claude Sonnet 4.6 only.
Which has the bigger context window, Claude Sonnet 4.6 or Muse Spark Open?
Muse Spark Open, with 1.05M tokens against 1M.
How many benchmarks is the Claude Sonnet 4.6 vs Muse Spark Open comparison based on?
24 benchmarks have a result for both models as of October 22, 2026. Claude Sonnet 4.6's coding index rests on 5 independent benchmarks and Muse Spark Open's on 4. Where only one model has a result, the page says so instead of naming a winner.