Claude Opus 4.5 vs Muse Spark
Head-to-head comparison across 5benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Verdict
Muse Spark leads for most workloads.
Based on BenchLM composite scores, July 2026.
Claude Opus 4.5
73
Muse Spark
76
Verified leaderboard positions: Claude Opus 4.5 #20 · Muse Spark unranked
Pick Muse Spark if you want the stronger benchmark profile. Claude Opus 4.5 only becomes the better choice if reasoning 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 |
|---|---|---|---|
| Reasoning | 64.4 | ← 21.9 | 42.5 |
| Multimodal | 69.9 | → 12.6 | 82.5 |
| Knowledge | 58.5 | ← 8.1 | 50.4 |
| Coding | 66.0 | ← 4.3 | 61.7 |
| Agentic | 62.6 | ← 3.6 | 59.0 |
| Math | 90.2 | — | — |
| Multilingual | 85.7 | — | — |
| Inst. Following | 69.5 | — | — |
Operational Comparison
Claude Opus 4.5
Muse Spark
$5 / $25
N/A
46 t/s
N/A
1.01s
N/A
200K
262K
Quick Verdict
Pick Muse Spark if you want the stronger benchmark profile. Claude Opus 4.5 only becomes the better choice if reasoning is the priority or you would rather avoid the extra latency and token burn of a reasoning model.
Muse Spark has the cleaner provisional overall profile here, landing at 76 versus 73. It is a real lead, but still close enough that category-level strengths matter more than the headline number.
Muse Spark's sharpest advantage is in multimodal & grounded, where it averages 82.5 against 69.9. The single biggest benchmark swing on the page is HLE, 30.8% to 50.4%. Claude Opus 4.5 does hit back in reasoning, so the answer changes if that is the part of the workload you care about most.
Muse Spark 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 gives you the larger context window at 262K, compared with 200K for Claude Opus 4.5.
Benchmark Deep Dive
Frequently Asked Questions (6)
Which is better, Claude Opus 4.5 or Muse Spark?
Muse Spark is ahead on BenchLM's provisional leaderboard, 76 to 73. The biggest single separator in this matchup is HLE, where the scores are 30.8% and 50.4%.
Which is better for knowledge tasks, Claude Opus 4.5 or Muse Spark?
Claude Opus 4.5 has the edge for knowledge tasks in this comparison, averaging 58.5 versus 50.4. Inside this category, AA-HLE is the benchmark that creates the most daylight between them.
Which is better for coding, Claude Opus 4.5 or Muse Spark?
Claude Opus 4.5 has the edge for coding in this comparison, averaging 66 versus 61.7. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
Which is better for reasoning, Claude Opus 4.5 or Muse Spark?
Claude Opus 4.5 has the edge for reasoning in this comparison, averaging 64.4 versus 42.5. Inside this category, CritPt is the benchmark that creates the most daylight between them.
Which is better for agentic tasks, Claude Opus 4.5 or Muse Spark?
Claude Opus 4.5 has the edge for agentic tasks in this comparison, averaging 62.6 versus 59. Inside this category, CyberGym 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?
Muse Spark has the edge for multimodal and grounded tasks in this comparison, averaging 82.5 versus 69.9. Inside this category, ScreenSpot Pro is the benchmark that creates the most daylight between them.
Related Comparisons
The AI models change fast. We track them for you.
For engineers, researchers, and the plain curious — a weekly brief on new models, ranking shifts, and pricing changes.
Free. No spam. Unsubscribe anytime.