Claude Opus 4.8 vs Muse Spark 1.2
Claude Opus 4.8 leads Muse Spark 1.2 on coding, 65.0 to 55.7 on the Vibe Coding Index, and Muse Spark 1.2 costs 5.9x less per output token ($4.25 vs $25.00 per million). Updated October 22, 2026; 92 benchmarks have a result for both.
Claude Opus 4.8 or Muse Spark 1.2: which to pick
Pick Claude Opus 4.8 for coding: it scores 65.0 on the Vibe Coding Index against 55.7 for Muse Spark 1.2.
Pick Muse Spark 1.2 for output tokens 5.9x cheaper ($4.25 vs $25.00 per million) and a lower cost per solved task ($0.64 against $2.17).
- Shared results
- 92
- Claude Opus 4.8 only
- 38
- 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.
Coding
Vibe Coding Index, six public coding benchmarks
Claude Opus 4.8
Claude Opus 4.8 scores 65.0 against 55.7.
6 and 5 benchmarks behind the scores
Intelligence
AA Intelligence Index
Claude Opus 4.8
Claude Opus 4.8 leads, 41.8 against 39.6.
Same board, both measured
Agentic work
AA Agentic Index
Muse Spark 1.2
Muse Spark 1.2 leads, 43.2 against 41.9.
Same board, both measured
Reasoning
GPQA Diamond
No call
Only Claude Opus 4.8 has a GPQA Diamond result, 92.4%.
Directional only
Knowledge
MMLU Pro
Claude Opus 4.8
Claude Opus 4.8 leads, 89.6% against 88.3%.
Same board, both measured
Web design
Design Arena: websites
Muse Spark 1.2
Muse Spark 1.2 leads, 1312 against 1258.
Same board, both measured
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 Opus 4.8 $0.018, Muse Spark 1.2 $0.0034 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
Muse Spark 1.2
Claude Opus 4.8 $2.17, Muse Spark 1.2 $0.64.
Published attempt cost and pass rate
At a glance
- Coding index
- Claude Opus 4.8 65.0 from 6 benchmarks, Muse Spark 1.2 55.7 from 5 benchmarks.
- Widest category
- Agentic work, 10.2 points apart on average over 16 shared benchmarks.
- Widest single gap
- LiveBench browser: Claude Opus 4.8 96.0% against Muse Spark 1.2 36.0%, 60.0 points apart on a 0 to 100 scale.
- Output price
- Claude Opus 4.8 $25.00 against Muse Spark 1.2 $4.25 per million output tokens, 5.9x apart.
- Context window
- Claude Opus 4.8 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 Opus 4.8 | Bars | Muse Spark 1.2 | Ties |
|---|---|---|---|---|
| Coding | 11 | 5 | ||
| Intelligence | 2 | 0 | ||
| Agentic work | 12 | 3 | 1 tie | |
| Reasoning | 5 | 5 | ||
| Math | 3 | 0 | ||
| Knowledge | 3 | 8 | ||
| Web design | 1 | 8 | ||
| General | 9 | 16 | ||
| All shared boards | 46 | 45 | 1 tie |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index115
| Benchmark | Claude Opus 4.8 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| LiveBench coding | 77.3% | 78.2% | Muse Spark 1.2 |
| LMArena WebDev | 1556 | 1534 | Claude Opus 4.8 |
| AA Coding Index | 74.3 | 72.2 | Claude Opus 4.8 |
| LiveCodeBench (Vals AI) | 87.8% | Not measured | Only Claude Opus 4.8 measured |
| SWE-bench Verified (Vals AI) | 88.6% | 86.6% | Claude Opus 4.8 |
| Terminal-Bench 4 (Vals AI) | 23.2% | 6.1% | Claude Opus 4.8 |
| Vibe Code Bench (Vals AI) | 82.7% | 79.1% | Claude Opus 4.8 |
| Code migration (Vals AI) | 47.3% | 29.9% | Claude Opus 4.8 |
| ProgramBench (Vals AI) | 1.0% | 0.5% | Claude Opus 4.8 |
| IOI (Vals AI) | Not measured | 21.8% | Only Muse Spark 1.2 measured |
| Terminal-Bench 2.1 (Vals AI) | 71.9% | 69.7% | Claude Opus 4.8 |
| SkillsBench (Vals AI) | 59.2% | 53.0% | Claude Opus 4.8 |
| CyberBench (Vals AI) | Not measured | 69.5% | Only Muse Spark 1.2 measured |
| SciCode | 54.4% | 57.4% | Muse Spark 1.2 |
| Terminal-Bench Hard (Artificial Analysis run) | 58.3% | Not measured | Only Claude Opus 4.8 measured |
| FrontierCode | 46.5% | Not measured | Only Claude Opus 4.8 measured |
| FrontierSWE | Not measured | 12.0% | Only Muse Spark 1.2 measured |
| GSO-Bench | 47.1% | Not measured | Only Claude Opus 4.8 measured |
| WeirdML | 82.9% | 60.3% | Claude Opus 4.8 |
| LMArena Text: coding | 1490 | 1505 | Muse Spark 1.2 |
| LMArena Text: software and IT | 1488 | 1505 | Muse Spark 1.2 |
| LMArena WebDev: React | 1557 | 1526 | Claude Opus 4.8 |
| LMArena WebDev: HTML | 1543 | 1543 | Muse Spark 1.2 |
| SciCode | 12.3% | Not measured | Only Claude Opus 4.8 measured |
| Neither model has a result on the other 15 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | Claude Opus 4.8 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| AA Intelligence Index | 41.8 | 39.6 | Claude Opus 4.8 |
| Epoch Capabilities Index | 159.0 | 155.1 | Claude Opus 4.8 |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index123
| Benchmark | Claude Opus 4.8 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| AA Agentic Index | 41.9 | 43.2 | Muse Spark 1.2 |
| Design Arena: agents building web apps | 1233 | 1221 | Claude Opus 4.8 |
| Design Arena: agents building full-stack apps | 1249 | 1210 | Claude Opus 4.8 |
| Design Arena: agents building mobile apps | 1222 | 1181 | Claude Opus 4.8 |
| Design Arena: agents building Android apps | 1233 | 1222 | Claude Opus 4.8 |
| Design Arena: agents building Godot games | 1231 | Not measured | Only Claude Opus 4.8 measured |
| Design Arena: agents building games | 1239 | 1179 | Claude Opus 4.8 |
| Design Arena: HTML slides | 1171 | 1085 | Claude Opus 4.8 |
| Design Arena: PowerPoint slides | 1202 | 1172 | Claude Opus 4.8 |
| Design Arena: spreadsheets | 1303 | Not measured | Only Claude Opus 4.8 measured |
| LiveBench research | 81.8% | 67.7% | Claude Opus 4.8 |
| LiveBench browser | 96.0% | 36.0% | Claude Opus 4.8 |
| LiveBench long agentic | 48.3% | 21.3% | Claude Opus 4.8 |
| SREBench (Vals AI) | Not measured | 0.0% | Only Muse Spark 1.2 measured |
| Finance Agent (Vals AI) | 53.9% | 60.6% | Muse Spark 1.2 |
| Tax Agent Bench (Vals AI) | 30.0% | 32.8% | Muse Spark 1.2 |
| Legal Research Bench (Vals AI) | 43.8% | 43.8% | Tie |
| Excel Modeling Benchmark (Vals AI) | 69.4% | 57.0% | Claude Opus 4.8 |
| BioMysteryBench (Vals AI) | Not measured | 64.8% | Only Muse Spark 1.2 measured |
| Terminal-Bench-Science (Vals AI) | 4.3% | Not measured | Only Claude Opus 4.8 measured |
| Time Horizon Index (Vals AI) | 11.8% | Not measured | Only Claude Opus 4.8 measured |
| τ²-Bench Telecom | 94.4% | Not measured | Only Claude Opus 4.8 measured |
| APEX-Agents | 48.9% | 45.4% | Claude Opus 4.8 |
| Remote Labor Index | 8.3% | Not measured | Only Claude Opus 4.8 measured |
| OSWorld 2.0 | 20.6% | Not measured | Only Claude Opus 4.8 measured |
| DeepResearch Bench | 50.2% | Not measured | Only Claude Opus 4.8 measured |
| PostTrainBench | 33.8% | Not measured | Only Claude Opus 4.8 measured |
| Vending-Bench 2 | $5,787 | Not measured | Only Claude Opus 4.8 measured |
| LMArena Search | 1204 | Not measured | Only Claude Opus 4.8 measured |
| Neither model has a result on the other 12 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index55
| Benchmark | Claude Opus 4.8 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| GPQA Diamond | 92.4% | Not measured | Only Claude Opus 4.8 measured |
| LiveBench reasoning | 89.2% | 90.0% | Muse Spark 1.2 |
| MMMU Pro (Vals AI) | 86.6% | 86.1% | Claude Opus 4.8 |
| GPQA Diamond (Artificial Analysis run) | 92.0% | 90.4% | Claude Opus 4.8 |
| Humanity's Last Exam (Artificial Analysis run) | 48.7% | 45.5% | Claude Opus 4.8 |
| GPQA Diamond (Epoch AI run) | 91.0% | Not measured | Only Claude Opus 4.8 measured |
| ARC-AGI | 92.5% | Not measured | Only Claude Opus 4.8 measured |
| ARC-AGI-2 | 72.1% | Not measured | Only Claude Opus 4.8 measured |
| SimpleBench | 64.8% | 74.5% | Muse Spark 1.2 |
| Chess puzzles | 52.0% | 27.0% | Claude Opus 4.8 |
| Mystery game puzzles | 36.0% | Not measured | Only Claude Opus 4.8 measured |
| EBR-bench | 28.6% | Not measured | Only Claude Opus 4.8 measured |
| LMArena Text: hard prompts | 1482 | 1489 | Muse Spark 1.2 |
| LMArena Text: expert | 1503 | 1475 | Claude Opus 4.8 |
| LMArena Text: hard prompts in English | 1487 | 1487 | Muse Spark 1.2 |
| LMArena Vision: diagrams | 1315 | 1317 | Muse Spark 1.2 |
| LMArena Vision: homework | 1337 | Not measured | Only Claude Opus 4.8 measured |
| Kagi LLM Benchmark | 88.8% | Not measured | Only Claude Opus 4.8 measured |
| Neither model has a result on the other 4 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index30
| Benchmark | Claude Opus 4.8 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| OTIS Mock AIME | 98.3% | Not measured | Only Claude Opus 4.8 measured |
| FrontierMath, tiers 1 to 3 | 80.0% | Not measured | Only Claude Opus 4.8 measured |
| FrontierMath, tier 4 | 56.1% | Not measured | Only Claude Opus 4.8 measured |
| ProofBench | 69.0% | 43.0% | Claude Opus 4.8 |
| LMArena Text: math | 1486 | 1484 | Claude Opus 4.8 |
| LMArena Text: mathematical work | 1497 | 1480 | Claude Opus 4.8 |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index38
| Benchmark | Claude Opus 4.8 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| MMLU Pro | 89.6% | 88.3% | Claude Opus 4.8 |
| LegalBench (Vals AI) | 83.6% | 85.3% | Muse Spark 1.2 |
| CorpFin (Vals AI) | 66.7% | 70.9% | Muse Spark 1.2 |
| TaxEval (Vals AI) | 75.6% | 80.4% | Muse Spark 1.2 |
| MortgageTax (Vals AI) | 69.9% | 65.4% | Claude Opus 4.8 |
| MedCode (Vals AI) | 53.2% | 49.4% | Claude Opus 4.8 |
| SimpleQA Verified | 53.0% | 60.3% | Muse Spark 1.2 |
| LMArena Text: science | 1477 | 1500 | Muse Spark 1.2 |
| LMArena Text: medicine and healthcare | 1464 | 1496 | Muse Spark 1.2 |
| LMArena Text: legal and government | 1477 | 1517 | Muse Spark 1.2 |
| LMArena Text: business and finance | 1458 | 1484 | Muse Spark 1.2 |
| FACTS Benchmark Suite | 53.5% | Not measured | Only Claude Opus 4.8 measured |
| Neither model has a result on the other 6 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index18
| Benchmark | Claude Opus 4.8 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| Design Arena: websites | 1258 | 1312 | Muse Spark 1.2 |
| Design Arena: UI components | 1255 | 1298 | Muse Spark 1.2 |
| Design Arena: game dev | 1264 | 1301 | Muse Spark 1.2 |
| Design Arena: data viz | 1240 | 1334 | Muse Spark 1.2 |
| Design Arena: 3D | 1222 | 1301 | Muse Spark 1.2 |
| Design Arena: all code categories | 1255 | 1312 | Muse Spark 1.2 |
| Design Arena: SVG | 1195 | 1284 | Muse Spark 1.2 |
| Design Arena: ASCII art | 1277 | 1284 | Muse Spark 1.2 |
| LiveBench design | 78.8% | 67.1% | Claude Opus 4.8 |
GeneralLike-for-likePublic boards, shown as published, kept out of the index916
| Benchmark | Claude Opus 4.8 | Muse Spark 1.2 | Leader |
|---|---|---|---|
| LiveBench data analysis | 66.0% | 76.5% | Muse Spark 1.2 |
| Public Benefits Bench (Vals AI) | 68.1% | 68.5% | Muse Spark 1.2 |
| SAGE (Vals AI) | 54.8% | 47.7% | Claude Opus 4.8 |
| MedScribe (Vals AI) | 85.8% | 90.1% | Muse Spark 1.2 |
| Vals Multimodal Index | 70.9% | 69.8% | Claude Opus 4.8 |
| IFBench | 62.2% | Not measured | Only Claude Opus 4.8 measured |
| Long context reasoning (AA-LCR) | 77.7% | 79.0% | Muse Spark 1.2 |
| DTBench | 94.9% | 94.7% | Claude Opus 4.8 |
| LMCA | 57.5% | 48.4% | Claude Opus 4.8 |
| Surface Evolver Bench | 87.5% | Not measured | Only Claude Opus 4.8 measured |
| Furniture assembly | 42.5% | Not measured | Only Claude Opus 4.8 measured |
| LMArena Text | 1461 | 1482 | Muse Spark 1.2 |
| LMArena Text: instruction following | 1476 | 1462 | Claude Opus 4.8 |
| LMArena Text: creative writing | 1454 | 1436 | Claude Opus 4.8 |
| LMArena Vision | 1294 | 1304 | Muse Spark 1.2 |
| LMArena Text: English | 1468 | 1483 | Muse Spark 1.2 |
| LMArena Text: non-English | 1450 | 1476 | Muse Spark 1.2 |
| LMArena Text: Chinese | 1506 | 1509 | Muse Spark 1.2 |
| LMArena Text: German | 1472 | Not measured | Only Claude Opus 4.8 measured |
| LMArena Text: Japanese | 1442 | Not measured | Only Claude Opus 4.8 measured |
| LMArena Text: Korean | 1431 | 1462 | Muse Spark 1.2 |
| LMArena Text: French | 1481 | 1495 | Muse Spark 1.2 |
| LMArena Text: Spanish | 1465 | 1484 | Muse Spark 1.2 |
| LMArena Text: Russian | 1474 | 1483 | Muse Spark 1.2 |
| LMArena Text: Polish | 1459 | Not measured | Only Claude Opus 4.8 measured |
| LMArena Text: multi-turn | 1476 | 1502 | Muse Spark 1.2 |
| LMArena Text: longer queries | 1483 | 1473 | Claude Opus 4.8 |
| LMArena Text: writing and language | 1461 | 1453 | Claude Opus 4.8 |
| LMArena Text: entertainment and media | 1440 | 1443 | Muse Spark 1.2 |
| LMArena Vision: English | 1293 | 1291 | Claude Opus 4.8 |
| LMArena Vision: Chinese | 1346 | Not measured | Only Claude Opus 4.8 measured |
| LMArena Vision: reading text | 1303 | 1313 | Muse Spark 1.2 |
| LMArena Vision: humor | 1282 | Not measured | Only Claude Opus 4.8 measured |
| LMArena Vision: creative writing | 1301 | Not measured | Only Claude Opus 4.8 measured |
| LMArena Document | 1475 | Not measured | Only Claude Opus 4.8 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 Opus 4.8 | 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
Muse Spark 1.2 costs less
Repository review
50K input + 3K output tokens
Muse Spark 1.2 costs less
Agent loop
200K input + 10K output tokens
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 Opus 4.8 | Meta Muse Spark 1.2 |
|---|---|---|
| Maker | Anthropic | Meta |
| Weights | No public weights listed | No public weights listed |
| Released | May 27, 2026 | August 5, 2026 |
| Context window | 1M | 1.05M |
| Input $/Mtok | $5.00 | $1.25 |
| Output $/Mtok | $25.00 | $4.25 |
| Coding index | 65.0 | 55.7 |
| Independent measurements behind it | 6 | 5 |
| Cost per solved task | $2.17 | $0.64 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Claude Opus 4.8 better than Muse Spark 1.2 for coding?
Pick Claude Opus 4.8 for coding: it scores 65.0 on the Vibe Coding Index against 55.7 for Muse Spark 1.2. Pick Muse Spark 1.2 for output tokens 5.9x cheaper ($4.25 vs $25.00 per million) and a lower cost per solved task ($0.64 against $2.17).
Which is cheaper, Claude Opus 4.8 or Muse Spark 1.2?
Claude Opus 4.8 costs $5.00 per million input tokens and $25.00 per million output tokens; Muse Spark 1.2 costs $1.25 and $4.25. Per solved SWE-bench Verified task, Claude Opus 4.8 costs $2.17 and Muse Spark 1.2 $0.64.
Which has the bigger context window, Claude Opus 4.8 or Muse Spark 1.2?
Muse Spark 1.2, with 1.05M tokens against 1M.
How many benchmarks is the Claude Opus 4.8 vs Muse Spark 1.2 comparison based on?
92 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.8'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.