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Haiku 5.5 low vs Haiku 5.5 low+guidance

Haiku 5.5 low+guidance leads on quality: 0.5 points higher; Haiku 5.5 low leads on cost and agent time: 1.1× cheaper and 1.3× faster.

24 tasksData from

Stet score

Haiku 5.5 lowclaude-code · low reasoningRank 11 of 15

41.995% range 35.3–48.5

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

42.495% range 33.2–51.70.5 points higher

A directional read: their 95% score ranges overlap.

Cost / task

Haiku 5.5 low$0.251.1× cheaper
Haiku 5.5 low+guidance$0.29

Agent time / task

Haiku 5.5 low9.9 min1.3× faster
Haiku 5.5 low+guidance12.4 min

Quality

Head-to-head matchups

Haiku 5.5 low won7

Tied10

Haiku 5.5 low+guidance won7

Haiku 5.5 low+guidance’s win share 51%, 95% range 36–65%Ties are within judge noise.

Task by task

Haiku 5.5 low solved 2 tasks that Haiku 5.5 low+guidance didn’t, and Haiku 5.5 low+guidance solved 0 that Haiku 5.5 low didn’t. Both solved 9; neither solved 13.

Haiku 5.5 low only 2

  • stet-15439c21Equivalent to the merged fix
  • stet-commit-5d766ddeEquivalent to the merged fix

Haiku 5.5 low+guidance only 0

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 lowHaiku 5.5 low+guidanceSolved 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-66762b4cEquivalent to the merged fixPassed testsBoth
stet-15439c21Equivalent to the merged fixFailedHaiku 5.5 low only
stet-commit-f0caded9Equivalent to the merged fixEquivalent to the merged fixBoth
stet-commit-5d766ddeEquivalent to the merged fixFailedHaiku 5.5 low only
stet-43493c52Passed testsPassed testsBoth
stet-6f84e978FailedFailedNeither
stet-commit-f8ae1177FailedFailedNeither
stet-2450ca2dFailedFailedNeither
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 lowHaiku 5.5 low+guidance
Harnessclaude-codeclaude-code
Reasoning effortlowlow
Rank11 of 1510 of 15
Stet score41.995% range 35.3–48.542.495% range 33.2–51.7
Solved11/247 passed, 4 judged equivalent9/248 passed, 1 judged equivalent
Cost / task$0.25$0.29
Agent time / task9.9 min12.4 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