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Haiku 5.5 low vs Muse control

Haiku 5.5 low leads on quality and agent time: 8.1 points higher and 1.3× faster; Muse control leads on cost: 2.5× cheaper.

24 tasksData from

Stet score

Haiku 5.5 lowRank 10 of 14

41.395% range 34.8–47.88.1 points higher

Muse controlRank 12 of 14

33.295% range 24.3–42.4

A directional read: their 95% score ranges overlap.

Cost / task

Haiku 5.5 low$0.25
Muse control$0.102.5× cheaper

Agent time / task

Haiku 5.5 low9.9 min1.3× faster
Muse control13.2 min

Task by task

Haiku 5.5 low solved 2 tasks that Muse control didn’t, and Muse control solved 1 that Haiku 5.5 low didn’t. Both solved 9; neither solved 12.

Haiku 5.5 low only 2

  • stet-15439c21Equivalent to the merged fix
  • stet-commit-f0caded9Equivalent to the merged fix

Muse control only 1

  • 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 lowMuse 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-15439c21Equivalent to the merged fixFailedHaiku 5.5 low only
stet-66762b4cEquivalent to the merged fixPassed testsBoth
stet-commit-f0caded9Equivalent to the merged fixFailedHaiku 5.5 low only
stet-commit-5d766ddeEquivalent to the merged fixEquivalent to the merged fixBoth
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 lowMuse control
Rank10 of 1412 of 14
Stet score41.395% range 34.8–47.833.295% range 24.3–42.4
Solved11/247 passed, 4 judged equivalent10/248 passed, 2 judged equivalent
Passed review8/245/24
Matched merged change9/248/24
Cost / task$0.25$0.10
How cost was recordedreported by its harnessestimated from tokens
Agent time / task9.9 min13.2 min
Ran inDaytona sandboxlocal Docker

Where each setup is the better choice

The leaderboard’s readings on groups of tasks. Each group holds fewer tasks than the overall standings, so treat these as leads to test on your repo.

Changes up to 150 lines

11 tasks

11 tasks whose merged change was 2–149 lines in 1–2 files. The 7 small fixes below are among them.

Both matched the merged change on 7 of 11.

Haiku 5.5 low passed review more often: 7 of 11 to Muse control’s 5.

Changes up to 150 lines
Haiku 5.5 lowMuse control
Matched merged change7/117/11
Passed review7/115/11
Cost / task$0.02$0.03
Agent time / task2.8 min4.3 min

Small fixes

7 tasks

7 tasks whose instructions start with “Fix”. Their merged changes were 4–29 lines in 1–2 files.

Haiku 5.5 low matched the merged change more often: 5 of 7 to Muse control’s 4.

Small fixes
Haiku 5.5 lowMuse control
Matched merged change5/74/7
Passed review5/74/7
Cost / task$0.01$0.03
Agent time / task2.7 min4.3 min

Larger changes

13 tasks

13 tasks whose merged change ran over 150 lines or more than 3 files: 113–1,420 lines in 2–19 files.

Haiku 5.5 low matched the merged change more often: 2 of 13 to Muse control’s 1.

Larger changes
Haiku 5.5 lowMuse control
Matched merged change2/131/13
Passed review1/130/13
Cost / task$0.45$0.16
Agent time / task15.9 min20.8 min

From the leaderboard’s routing advice

  • Subagents: use Haiku 5.5 low.

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