Head-to-head comparison across 4benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Grok 4.20
64
Muse Spark
82
Pick Muse Spark if you want the stronger benchmark profile. Grok 4.20 only becomes the better choice if reasoning is the priority or you need the larger 2M context window.
Agentic
+11.9 difference
Coding
+0.7 difference
Reasoning
+10.8 difference
Multimodal
+11.4 difference
Grok 4.20
Muse Spark
$2 / $6
N/A
233 t/s
N/A
10.33s
N/A
2M
262K
Pick Muse Spark if you want the stronger benchmark profile. Grok 4.20 only becomes the better choice if reasoning is the priority or you need the larger 2M context window.
Muse Spark is clearly ahead on the provisional aggregate, 82 to 64. 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 agentic, where it averages 59 against 47.1. The single biggest benchmark swing on the page is CharXiv, 60.9% to 86.4%. Grok 4.20 does hit back in reasoning, so the answer changes if that is the part of the workload you care about most.
Grok 4.20 gives you the larger context window at 2M, compared with 262K for Muse Spark.
Muse Spark is ahead on BenchLM's provisional leaderboard, 82 to 64. The biggest single separator in this matchup is CharXiv, where the scores are 60.9% and 86.4%.
Muse Spark has the edge for coding in this comparison, averaging 61.7 versus 61. Inside this category, Terminal-Bench Hard is the benchmark that creates the most daylight between them.
Grok 4.20 has the edge for reasoning in this comparison, averaging 53.3 versus 42.5. Inside this category, AA-LCR is the benchmark that creates the most daylight between them.
Muse Spark has the edge for agentic tasks in this comparison, averaging 59 versus 47.1. Inside this category, GDPval-AA 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 70.8. Inside this category, GDPval-AA is the benchmark that creates the most daylight between them.
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