Claude Opus 4.5 vs Muse Spark 1.1
Head-to-head comparison across 4benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Verdict
Muse Spark 1.1 leads for most workloads.
Based on BenchLM composite scores, July 2026.
Claude Opus 4.5
73
Muse Spark 1.1
78
Verified leaderboard positions: Claude Opus 4.5 #20 · Muse Spark 1.1 unranked
Pick Muse Spark 1.1 if you want the stronger benchmark profile. Claude Opus 4.5 only becomes the better choice if coding is the priority or you would rather avoid the extra latency and token burn of a reasoning model.
Category Radar
Head-to-Head by Category
Category Breakdown
| Benchmark | Claude Opus 4.5 | Δ | Muse Spark 1.1 |
|---|---|---|---|
| Multimodal | 69.9 | → 18.5 | 88.4 |
| Agentic | 62.6 | → 17.8 | 80.4 |
| Coding | 66.0 | ← 4.5 | 61.5 |
| Knowledge | 58.5 | → 3.6 | 62.1 |
| Reasoning | 64.4 | — | — |
| Math | 90.2 | — | — |
| Multilingual | 85.7 | — | — |
| Inst. Following | 69.5 | — | — |
Operational Comparison
Claude Opus 4.5
Muse Spark 1.1
$5 / $25
N/A
46 t/s
N/A
1.01s
N/A
200K
1M
Quick Verdict
Pick Muse Spark 1.1 if you want the stronger benchmark profile. Claude Opus 4.5 only becomes the better choice if coding is the priority or you would rather avoid the extra latency and token burn of a reasoning model.
Muse Spark 1.1 is clearly ahead on the provisional aggregate, 78 to 73. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Muse Spark 1.1's sharpest advantage is in multimodal & grounded, where it averages 88.4 against 69.9. The single biggest benchmark swing on the page is HLE, 30.8% to 62.1%. Claude Opus 4.5 does hit back in coding, so the answer changes if that is the part of the workload you care about most.
Muse Spark 1.1 is the reasoning model in the pair, while Claude Opus 4.5 is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use. Muse Spark 1.1 gives you the larger context window at 1M, compared with 200K for Claude Opus 4.5.
Benchmark Deep Dive
Frequently Asked Questions (5)
Which is better, Claude Opus 4.5 or Muse Spark 1.1?
Muse Spark 1.1 is ahead on BenchLM's provisional leaderboard, 78 to 73. The biggest single separator in this matchup is HLE, where the scores are 30.8% and 62.1%.
Which is better for knowledge tasks, Claude Opus 4.5 or Muse Spark 1.1?
Muse Spark 1.1 has the edge for knowledge tasks in this comparison, averaging 62.1 versus 58.5. Inside this category, HLE is the benchmark that creates the most daylight between them.
Which is better for coding, Claude Opus 4.5 or Muse Spark 1.1?
Claude Opus 4.5 has the edge for coding in this comparison, averaging 66 versus 61.5. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, Claude Opus 4.5 or Muse Spark 1.1?
Muse Spark 1.1 has the edge for agentic tasks in this comparison, averaging 80.4 versus 62.6. Inside this category, MCP Atlas is the benchmark that creates the most daylight between them.
Which is better for multimodal and grounded tasks, Claude Opus 4.5 or Muse Spark 1.1?
Muse Spark 1.1 has the edge for multimodal and grounded tasks in this comparison, averaging 88.4 versus 69.9. Inside this category, CharXiv is the benchmark that creates the most daylight between them.
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