Head-to-head comparison across 1benchmark categories. Overall scores shown here use BenchLM's provisional ranking lane.
Claude Haiku 4.5
63
Muse Spark
69
Pick Muse Spark if you want the stronger benchmark profile. Claude Haiku 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.
Coding
+11.6 difference
Claude Haiku 4.5
Muse Spark
$0.8 / $4
N/A
N/A
N/A
N/A
N/A
200K
262K
Pick Muse Spark if you want the stronger benchmark profile. Claude Haiku 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 is clearly ahead on the provisional aggregate, 69 to 63. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.
Muse Spark is the reasoning model in the pair, while Claude Haiku 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 Haiku 4.5.
Muse Spark is ahead on BenchLM's provisional leaderboard, 69 to 63. The biggest single separator in this matchup is SWE-bench Verified, where the scores are 73.3% and 77.4%.
Claude Haiku 4.5 has the edge for coding in this comparison, averaging 73.3 versus 61.7. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.
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