Skip to the comparison
STET
Join the waitlist

Haiku 5.5 max vs Muse Spark 1.3 high

No clear quality winner: Haiku 5.5 max won 15, Muse Spark 1.3 high won 5, 3 tied, 1 undecided; Muse Spark 1.3 high leads on cost and agent time: 38.4× cheaper and 4.4× faster.

24 tasksData from

Stet score

Haiku 5.5 maxclaude-code · max reasoningRank 8 of 16

55.595% range 44.6–65.723.6 points higher

Muse Spark 1.3 highmuse · high reasoningRank 14 of 16

31.995% range 23.5–40.6

Their 95% score ranges don’t overlap.

Cost / task

Haiku 5.5 max$3.85
Muse Spark 1.3 high$0.1038.4× cheaper

Agent time / task

Haiku 5.5 max58.4 min
Muse Spark 1.3 high13.2 min4.4× faster

Quality

Head-to-head matchups

Haiku 5.5 max won15

Tied31 undecided

Muse Spark 1.3 high won5

Haiku 5.5 max’s win share 73%, 95% range 55–88%Ties are within judge noise.

Task by task

Haiku 5.5 max solved 5 tasks that Muse Spark 1.3 high didn’t, and Muse Spark 1.3 high solved 3 that Haiku 5.5 max didn’t. Both solved 7; neither solved 8.

Haiku 5.5 max only 5

  • stet-15439c21Passed tests
  • stet-commit-f0caded9Passed tests
  • stet-6f84e978Equivalent to the merged fix
  • stet-commit-342d0ac0Equivalent to the merged fix
  • stet-commit-f8ae1177Passed tests

Muse Spark 1.3 high only 3

  • stet-232b50baPassed tests
  • stet-66762b4cPassed tests
  • stet-43493c52Passed tests

A task counts as solved when its tests passed or a judge found the fix equivalent to the merged change, as in the leaderboard’s Solved column. Stet score also weighs code quality, so it can order the two differently. 1 of the 24 tasks is left out because one of the two has no scored result on it.

All 23 compared tasks
Task by task
TaskHaiku 5.5 maxMuse Spark 1.3 highSolved by
stet-3169aefaPassed testsPassed testsBoth
stet-89dfbc27Passed testsPassed testsBoth
stet-b28f4fe7Passed testsPassed testsBoth
stet-232b50baFailedPassed testsMuse Spark 1.3 high only
stet-5276aa3fPassed testsPassed testsBoth
stet-commit-bbbbae09Passed testsPassed testsBoth
stet-66762b4cFailedPassed testsMuse Spark 1.3 high only
stet-15439c21Passed testsFailedHaiku 5.5 max only
stet-commit-5d766ddeEquivalent to the merged fixEquivalent to the merged fixBoth
stet-43493c52FailedPassed testsMuse Spark 1.3 high only
stet-commit-f0caded9Passed testsFailedHaiku 5.5 max only
stet-6f84e978Equivalent to the merged fixFailedHaiku 5.5 max only
stet-2450ca2dPassed testsEquivalent to the merged fixBoth
stet-commit-342d0ac0Equivalent to the merged fixFailedHaiku 5.5 max only
stet-commit-f8ae1177Passed testsFailedHaiku 5.5 max only
stet-commit-5e075641FailedFailedNeither
stet-commit-2826765eFailedFailedNeither
stet-commit-a8716b88FailedFailedNeither
stet-commit-e928166fFailedFailedNeither
stet-commit-30506f8eFailedFailedNeither
stet-commit-87814583FailedFailedNeither
stet-commit-d2ab0c25FailedFailedNeither
stet-commit-e41c2e2dFailedFailedNeither

Side by side

Side by side
MetricHaiku 5.5 maxMuse Spark 1.3 high
Harnessclaude-codemuse
Reasoning effortmaxhigh
Rank8 of 1614 of 16
Stet score55.595% range 44.6–65.731.995% range 23.5–40.6
Solved12/249 passed, 3 judged equivalent10/248 passed, 2 judged equivalent
Cost / task$3.85$0.10
Agent time / task58.4 min13.2 min

See which setup wins on your repo

Stet replays your merged PRs, scores quality above pass/fail, and delivers comparison reports through your agent.

Run it on your repo

About this data

  • 24 tasks, each a merged change replayed from the repo as it was just before the merge.
  • Data from .
  • Both setups come from the same leaderboard run of 16 setups: bmk_d4ba310fdf50db4ccb2092e3.

See all 16 setups on the leaderboardHow Stet measures