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Haiku 5.5 low+guidance vs Muse control

Haiku 5.5 low+guidance leads on quality and agent time: 8.3 points higher and 1.1× faster; Muse control leads on cost: 2.9× cheaper.

24 tasksData from

Stet score

Haiku 5.5 low+guidanceclaude-code · low reasoningRank 10 of 15

42.495% range 33.2–51.78.3 points higher

Muse controlmuse · high reasoningRank 13 of 15

34.195% range 25.3–43.3

A directional read: their 95% score ranges overlap.

Cost / task

Haiku 5.5 low+guidance$0.29
Muse control$0.102.9× cheaper

Agent time / task

Haiku 5.5 low+guidance12.4 min1.1× faster
Muse control13.2 min

Quality

Head-to-head matchups

Haiku 5.5 low+guidance won10

Tied7

Muse control won7

Haiku 5.5 low+guidance’s win share 53%, 95% range 36–70%Ties are within judge noise.

Task by task

Haiku 5.5 low+guidance solved 1 task that Muse control didn’t, and Muse control solved 2 that Haiku 5.5 low+guidance didn’t. Both solved 8; neither solved 13.

Haiku 5.5 low+guidance only 1

  • stet-commit-f0caded9Equivalent to the merged fix

Muse control only 2

  • stet-commit-5d766ddeEquivalent to the merged fix
  • stet-2450ca2dEquivalent to the merged fix

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.

All 24 compared tasks
Task by task
TaskHaiku 5.5 low+guidanceMuse controlSolved by
stet-3169aefaPassed testsPassed testsBoth
stet-89dfbc27Passed testsPassed testsBoth
stet-b28f4fe7Passed testsPassed testsBoth
stet-232b50baPassed testsPassed testsBoth
stet-5276aa3fPassed testsPassed testsBoth
stet-commit-bbbbae09Passed testsPassed testsBoth
stet-66762b4cPassed testsPassed testsBoth
stet-15439c21FailedFailedNeither
stet-commit-f0caded9Equivalent to the merged fixFailedHaiku 5.5 low+guidance only
stet-commit-5d766ddeFailedEquivalent to the merged fixMuse control only
stet-43493c52Passed testsPassed testsBoth
stet-6f84e978FailedFailedNeither
stet-commit-f8ae1177FailedFailedNeither
stet-2450ca2dFailedEquivalent to the merged fixMuse control only
stet-commit-342d0ac0FailedFailedNeither
stet-commit-60a0e6c2FailedFailedNeither
stet-commit-5e075641FailedFailedNeither
stet-commit-2826765eFailedFailedNeither
stet-commit-a8716b88FailedFailedNeither
stet-commit-30506f8eFailedFailedNeither
stet-commit-87814583FailedFailedNeither
stet-commit-d2ab0c25FailedFailedNeither
stet-commit-e41c2e2dFailedFailedNeither
stet-commit-e928166fFailedFailedNeither

Side by side

Side by side
MetricHaiku 5.5 low+guidanceMuse control
Harnessclaude-codemuse
Reasoning effortlowhigh
Rank10 of 1513 of 15
Stet score42.495% range 33.2–51.734.195% range 25.3–43.3
Solved9/248 passed, 1 judged equivalent10/248 passed, 2 judged equivalent
Cost / task$0.29$0.10
Agent time / task12.4 min13.2 min

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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 15 setups: bmk_d4ba310fdf50db4ccb2092e3.

See all 15 setups on the leaderboardHow Stet measures