Head-to-head comparison across 5benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Opus 4.5
77
Muse Spark
82
Verified leaderboard positions: Claude Opus 4.5 #11 · 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.
Agentic
+3.5 difference
Coding
+4.2 difference
Reasoning
+21.9 difference
Knowledge
+15.8 difference
Multimodal
+12.2 difference
Claude Opus 4.5
Muse Spark
$5 / $25
N/A
46 t/s
N/A
1.01s
N/A
200K
262K
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 is clearly ahead on the provisional aggregate, 82 to 77. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Muse Spark's sharpest advantage is in multimodal & grounded, where it averages 82.2 against 70. 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.
Muse Spark is ahead on BenchLM's provisional leaderboard, 82 to 77. The biggest single separator in this matchup is HLE, where the scores are 30.8% and 50.4%.
Claude Opus 4.5 has the edge for knowledge tasks in this comparison, averaging 66.2 versus 50.4. Inside this category, AA-HLE is the benchmark that creates the most daylight between them.
Claude Opus 4.5 has the edge for coding in this comparison, averaging 65.9 versus 61.7. Inside this category, SWE-bench Pro is the benchmark that creates the most daylight between them.
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.
Claude Opus 4.5 has the edge for agentic tasks in this comparison, averaging 62.5 versus 59. Inside this category, CyberGym is the benchmark that creates the most daylight between them.
Muse Spark has the edge for multimodal and grounded tasks in this comparison, averaging 82.2 versus 70. Inside this category, ScreenSpot Pro is the benchmark that creates the most daylight between them.
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