Model comparison
Claude Opus 5 vs Muse Spark 1.3
Claude Opus 5 is the stronger model overall, scoring 67.8 to 54.8 on the Noometry Index. Muse Spark 1.3 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 . 37 shared benchmarks.
MetaSummary
- They share 37 benchmarks with published results for both. Claude Opus 5 scores higher in 10 categories and Muse Spark 1.3 in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Claude Opus 5 leads 66.8 to 42.6.
- The biggest single-benchmark swing is ProofBench: 99% for Claude Opus 5 and 58% for Muse Spark 1.3.
- Muse Spark 1.3 is cheaper at $1.25 / $4.25 per million input/output tokens, against $5 / $25 for Claude Opus 5.
- Muse Spark 1.3 accepts more context: 1.05M tokens versus 1M.
Side by side
| Claude Opus 5 | Muse Spark 1.3 | |
|---|---|---|
| Provider | Anthropic | Meta |
| Noometry Index | 67.8 | 54.8 |
| Released | 2026-07-24 | 2026-09-02 |
| 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 | 37 |
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Category by category
Coding Claude Opus 5 leads
Claude Opus 5: 67.5 (#5), Muse Spark 1.3: 56.6 (#21)
| Benchmark | Claude Opus 5 | Muse Spark 1.3 |
|---|---|---|
| CursorBench | 46.6% | 41.6% |
| LMArena WebDev | 1691 | 1657 |
| SciCode | 56.4% | 59.7% |
| LMArena Coding | 1534 | 1514 |
| DeepSWE | 73.6% | — |
| FrontierCode | 53.4% | — |
| FrontierSWE | 52% | — |
| WeirdML | 91.8% | — |
| ALE-Bench | 2,165 | — |
Agentic & Tool Use Claude Opus 5 leads
Claude Opus 5: 55.6 (#1), Muse Spark 1.3: 38.6 (#30)
| Benchmark | Claude Opus 5 | Muse Spark 1.3 |
|---|---|---|
| APEX-Agents | 65.8% | 57.8% |
| GDP.pdf | 24% | 27.6% |
| 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 1.3: 54.0 (#27)
| Benchmark | Claude Opus 5 | Muse Spark 1.3 |
|---|---|---|
| NYT Connections (extended) | 94.3% | 85.1% |
| CritPt | 29.1% | 26% |
| Chess Puzzles | 42% | 38% |
| LMArena Hard Prompts | 1526 | 1503 |
| Mystery Game Puzzles | 59% | 25% |
| DTBench | 97.9% | 96.5% |
| LMCA | 64.5% | 53.9% |
| Bench to the Future 3 | 0.12 | 0.14 |
| Epoch Capabilities Index | 162.78 | 156.75 |
| ARC-AGI-2 | 90.4% | — |
| SimpleBench | 80.6% | — |
| ARC-AGI-1 | 97.5% | — |
| EBR-Bench | 45.7% | — |
Math Claude Opus 5 leads
Claude Opus 5: 86.2 (#8), Muse Spark 1.3: 73.1 (#21)
| Benchmark | Claude Opus 5 | Muse Spark 1.3 |
|---|---|---|
| FrontierMath (Tiers 1-3) | 85.6% | 74.4% |
| FrontierMath Tier 4 | 73.2% | 46.3% |
| OTIS Mock AIME 2024-2025 | 98.9% | 99.2% |
| ProofBench | 99% | 58% |
| LMArena Math | 1531 | 1494 |
Knowledge Claude Opus 5 leads
Claude Opus 5: 66.8 (#9), Muse Spark 1.3: 42.6 (#95)
| Benchmark | Claude Opus 5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Expert | 1557 | 1516 |
| GPQA Diamond | 93.9% | — |
| SimpleQA Verified | 59.9% | — |
Multimodal Claude Opus 5 leads
Claude Opus 5: 50.8 (#8), Muse Spark 1.3: 43.7 (#22)
| Benchmark | Claude Opus 5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Vision | 1319 | 1309 |
| LMArena Document | 1516 | 1471 |
| Blueprint-Bench 2 | 30.4% | — |
| Furniture Assembly | 60.8% | — |
Multilingual Claude Opus 5 leads
Claude Opus 5: 58.8 (#4), Muse Spark 1.3: 57.4 (#8)
| Benchmark | Claude Opus 5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Non-English | 1501 | 1481 |
| LMArena Chinese | 1574 | 1529 |
| LMArena French | 1519 | 1524 |
| LMArena German | 1524 | 1515 |
| LMArena Japanese | 1516 | 1474 |
| LMArena Korean | 1521 | 1501 |
| LMArena Russian | 1507 | 1490 |
| LMArena Spanish | 1519 | 1490 |
Instruction Following Claude Opus 5 leads
Claude Opus 5: 79.2 (#7), Muse Spark 1.3: 77.5 (#22)
| Benchmark | Claude Opus 5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Instruction Following | 1517 | 1477 |
Long Context Too close to call
Claude Opus 5: 46.5 (#21), Muse Spark 1.3: 45.6 (#32)
| Benchmark | Claude Opus 5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Longer Query | 1515 | 1488 |
Writing & Preference Claude Opus 5 leads
Claude Opus 5: 79.2 (#1), Muse Spark 1.3: 73.6 (#9)
| Benchmark | Claude Opus 5 | Muse Spark 1.3 |
|---|---|---|
| LMArena Text | 1507 | 1490 |
| LMArena Creative Writing | 1491 | 1455 |
| EQ-Bench Creative Writing | 2133 | 1906 |
| LMArena Multi-Turn | 1499 | 1482 |
| EQ-Bench 4 | 1385 | — |
Frequently asked questions
Is Claude Opus 5 better than Muse Spark 1.3?
Claude Opus 5 is the stronger model overall, scoring 67.8 to 54.8 on the Noometry Index. Muse Spark 1.3 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 1.3?
Muse Spark 1.3 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 1.3 better for coding?
Claude Opus 5 scores higher on coding benchmarks: 67.5 versus 56.6 in the Noometry coding category.
Which has the bigger context window?
Muse Spark 1.3 does, with 1.05M tokens against 1M.
How many benchmarks do Claude Opus 5 and Muse Spark 1.3 share?
37 benchmarks have published results for both models. Claude Opus 5 has 57 scored results on Noometry and Muse Spark 1.3 has 37.