Model comparison
Claude Opus 5 vs Muse Spark 1.2
Claude Opus 5 is the stronger model overall, scoring 67.8 to 50.3 on the Noometry Index. Muse Spark 1.2 costs 5.0× less per token, which makes it the better buy when Claude Opus 5's lead doesn't matter for your workload.
Last verified . 31 shared benchmarks.
MetaSummary
- They share 31 benchmarks with published results for both. Claude Opus 5 scores higher in 10 categories and Muse Spark 1.2 in 0 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 5 leads 86.2 to 46.4.
- The biggest single-benchmark swing is ProofBench: 99% for Claude Opus 5 and 43% for Muse Spark 1.2.
- Muse Spark 1.2 is cheaper at $1.25 / $4.25 per million input/output tokens, against $5 / $25 for Claude Opus 5.
- Muse Spark 1.2 accepts more context: 1.05M tokens versus 1M.
Side by side
| Claude Opus 5 | Muse Spark 1.2 | |
|---|---|---|
| Provider | Anthropic | Meta |
| Noometry Index | 67.8 | 50.3 |
| Released | 2026-07-24 | 2026-08-05 |
| Weights | Proprietary | Proprietary |
| Context window | 1M | 1.05M |
| Max output | 128K | 131K |
| Input $ / M tokens | $5 | $1.25 |
| Output $ / M tokens | $25 | $4.25 |
| Results tracked | 57 | 31 |
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Category by category
Coding Claude Opus 5 leads
Claude Opus 5: 67.5 (#5), Muse Spark 1.2: 49.2 (#51)
| Benchmark | Claude Opus 5 | Muse Spark 1.2 |
|---|---|---|
| DeepSWE | 73.6% | 54.9% |
| LMArena WebDev | 1691 | 1533 |
| FrontierSWE | 52% | 12% |
| SciCode | 56.4% | 56.4% |
| WeirdML | 91.8% | 60.3% |
| LMArena Coding | 1534 | 1495 |
| FrontierCode | 53.4% | — |
| CursorBench | 46.6% | — |
| ALE-Bench | 2,165 | — |
Agentic & Tool Use Claude Opus 5 leads
Claude Opus 5: 55.6 (#1), Muse Spark 1.2: 29.4 (#87)
| Benchmark | Claude Opus 5 | Muse Spark 1.2 |
|---|---|---|
| APEX-Agents | 65.8% | 36.4% |
| GDP.pdf | 24% | 16% |
| OSWorld 2.0 | 31.4% | — |
| τ²-bench Banking | 48.7% | — |
| PostTrainBench | 35% | — |
| BALROG | 63.4% | — |
| GBAEval | 79.6% | — |
| Vending-Bench 2 | 11,182 | — |
Reasoning Claude Opus 5 leads
Claude Opus 5: 77.2 (#4), Muse Spark 1.2: 51.3 (#34)
| Benchmark | Claude Opus 5 | Muse Spark 1.2 |
|---|---|---|
| SimpleBench | 80.6% | 74.5% |
| NYT Connections (extended) | 94.3% | 79.2% |
| CritPt | 29.1% | 17.7% |
| LMArena Hard Prompts | 1526 | 1486 |
| DTBench | 97.9% | 94.7% |
| LMCA | 64.5% | 48.4% |
| Epoch Capabilities Index | 162.78 | 154.87 |
| ARC-AGI-2 | 90.4% | — |
| ARC-AGI-1 | 97.5% | — |
| Chess Puzzles | 42% | — |
| EBR-Bench | 45.7% | — |
| Mystery Game Puzzles | 59% | — |
| Bench to the Future 3 | 0.12 | — |
Math Claude Opus 5 leads
Claude Opus 5: 86.2 (#8), Muse Spark 1.2: 46.4 (#70)
| Benchmark | Claude Opus 5 | Muse Spark 1.2 |
|---|---|---|
| ProofBench | 99% | 43% |
| LMArena Math | 1531 | 1471 |
| FrontierMath (Tiers 1-3) | 85.6% | — |
| FrontierMath Tier 4 | 73.2% | — |
| OTIS Mock AIME 2024-2025 | 98.9% | — |
Knowledge Claude Opus 5 leads
Claude Opus 5: 66.8 (#9), Muse Spark 1.2: 54.1 (#53)
| Benchmark | Claude Opus 5 | Muse Spark 1.2 |
|---|---|---|
| SimpleQA Verified | 59.9% | 60.3% |
| LMArena Expert | 1557 | 1480 |
| GPQA Diamond | 93.9% | — |
Multimodal Claude Opus 5 leads
Claude Opus 5: 50.8 (#8), Muse Spark 1.2: 43.4 (#25)
| Benchmark | Claude Opus 5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Vision | 1319 | 1305 |
| Blueprint-Bench 2 | 30.4% | — |
| Furniture Assembly | 60.8% | — |
| LMArena Document | 1516 | — |
Multilingual Claude Opus 5 leads
Claude Opus 5: 58.8 (#4), Muse Spark 1.2: 57.1 (#11)
| Benchmark | Claude Opus 5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Non-English | 1501 | 1478 |
| LMArena Chinese | 1574 | 1511 |
| LMArena French | 1519 | 1513 |
| LMArena Russian | 1507 | 1487 |
| LMArena Spanish | 1519 | 1498 |
| LMArena German | 1524 | — |
| LMArena Japanese | 1516 | — |
| LMArena Korean | 1521 | — |
Instruction Following Claude Opus 5 leads
Claude Opus 5: 79.2 (#7), Muse Spark 1.2: 76.7 (#36)
| Benchmark | Claude Opus 5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Instruction Following | 1517 | 1461 |
Long Context Claude Opus 5 leads
Claude Opus 5: 46.5 (#21), Muse Spark 1.2: 45.2 (#48)
| Benchmark | Claude Opus 5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Longer Query | 1515 | 1475 |
Writing & Preference Claude Opus 5 leads
Claude Opus 5: 79.2 (#1), Muse Spark 1.2: 72.3 (#14)
| Benchmark | Claude Opus 5 | Muse Spark 1.2 |
|---|---|---|
| LMArena Text | 1507 | 1482 |
| LMArena Creative Writing | 1491 | 1449 |
| EQ-Bench Creative Writing | 2133 | 1840 |
| LMArena Multi-Turn | 1499 | 1494 |
| EQ-Bench 4 | 1385 | — |
Frequently asked questions
Is Claude Opus 5 better than Muse Spark 1.2?
Claude Opus 5 is the stronger model overall, scoring 67.8 to 50.3 on the Noometry Index. Muse Spark 1.2 costs 5.0× less per token, which makes it the better buy when Claude Opus 5's lead doesn't matter for your workload.
Which is cheaper, Claude Opus 5 or Muse Spark 1.2?
Muse Spark 1.2 is cheaper. It lists at $1.25 per million input tokens and $4.25 per million output tokens; Claude Opus 5 lists at $5 and $25.
Is Claude Opus 5 or Muse Spark 1.2 better for coding?
Claude Opus 5 scores higher on coding benchmarks: 67.5 versus 49.2 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.2 does, with 1.05M tokens against 1M.
How many benchmarks do Claude Opus 5 and Muse Spark 1.2 share?
31 benchmarks have published results for both models. Claude Opus 5 has 57 scored results on Noometry and Muse Spark 1.2 has 31.