Head-to-head comparison across 5benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Opus 4.5
80
Muse Spark
80
Verified leaderboard positions: Claude Opus 4.5 #5 · Muse Spark unranked
Treat this as a split decision. Claude Opus 4.5 makes more sense if reasoning is the priority or you would rather avoid the extra latency and token burn of a reasoning model; Muse Spark is the better fit if multimodal & grounded is the priority or you need the larger 262K context window.
Agentic
+3.5 difference
Coding
+4.2 difference
Reasoning
+21.9 difference
Knowledge
+15.8 difference
Multimodal
+9.8 difference
Claude Opus 4.5
Muse Spark
$null / $null
N/A
46 t/s
N/A
1.01s
N/A
200K
262K
Treat this as a split decision. Claude Opus 4.5 makes more sense if reasoning is the priority or you would rather avoid the extra latency and token burn of a reasoning model; Muse Spark is the better fit if multimodal & grounded is the priority or you need the larger 262K context window.
Claude Opus 4.5 and Muse Spark finish on the same provisional overall score, so this is less about a single winner and more about where the edge shows up. The provisional headline says tie; the benchmark table is where the real choice happens.
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.
Claude Opus 4.5 and Muse Spark are tied on the provisional overall score, so the right pick depends on which category matters most for your use case.
Claude Opus 4.5 has the edge for knowledge tasks in this comparison, averaging 66.2 versus 50.4. Inside this category, 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. Muse Spark stays close enough that the answer can still flip depending on your workload.
Claude Opus 4.5 has the edge for agentic tasks in this comparison, averaging 62.5 versus 59. Inside this category, Terminal-Bench 2.0 is the benchmark that creates the most daylight between them.
Muse Spark has the edge for multimodal and grounded tasks in this comparison, averaging 80.4 versus 70.6. Inside this category, ScreenSpot Pro is the benchmark that creates the most daylight between them.
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