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Muse Wonder Full low vs Opus 4.8

No clear quality winner: Muse Wonder Full low won 14, Opus 4.8 won 5, 1 tied, 4 undecided; Muse Wonder Full low leads on agent time: 1.1× faster; Muse Wonder Full low’s cost wasn’t recorded.

24 tasksData from

Stet score

Muse Wonder Full lowmuse · low reasoningRank 1 of 16

72.495% range 60.4–83.332.6 points higher

Opus 4.8claude-code · medium reasoningRank 13 of 16

39.895% range 29.7–50.2

Their 95% score ranges don’t overlap.

Cost / task

Muse Wonder Full lownot recorded
Opus 4.8$7.05

Agent time / task

Muse Wonder Full low21.6 min1.1× faster
Opus 4.823.3 min

Quality

Head-to-head matchups

Muse Wonder Full low won14

Tied14 undecided

Opus 4.8 won5

Muse Wonder Full low’s win share 73%, 95% range 53–90%Ties are within judge noise.

Task by task

Muse Wonder Full low solved 2 tasks that Opus 4.8 didn’t, and Opus 4.8 solved 2 that Muse Wonder Full low didn’t. Both solved 10; neither solved 6.

Muse Wonder Full low only 2

  • stet-2450ca2dPassed tests
  • stet-commit-e928166fEquivalent to the merged fix

Opus 4.8 only 2

  • stet-6f84e978Passed tests
  • stet-commit-60a0e6c2Passed 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. 4 of the 24 tasks are left out because one of the two has no scored result on them.

All 20 compared tasks
Task by task
TaskMuse Wonder Full lowOpus 4.8Solved 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-15439c21Passed testsPassed testsBoth
stet-commit-5d766ddeEquivalent to the merged fixEquivalent to the merged fixBoth
stet-43493c52Passed testsPassed testsBoth
stet-6f84e978FailedPassed testsOpus 4.8 only
stet-2450ca2dPassed testsFailedMuse Wonder Full low only
stet-commit-342d0ac0FailedFailedNeither
stet-commit-60a0e6c2FailedPassed testsOpus 4.8 only
stet-commit-5e075641FailedFailedNeither
stet-commit-a8716b88FailedFailedNeither
stet-commit-e928166fEquivalent to the merged fixFailedMuse Wonder Full low only
stet-commit-30506f8eFailedFailedNeither
stet-commit-d2ab0c25FailedFailedNeither
stet-commit-e41c2e2dFailedFailedNeither

Side by side

Side by side
MetricMuse Wonder Full lowOpus 4.8
Harnessmuseclaude-code
Reasoning effortlowmedium
Rank1 of 1613 of 16
Stet score72.495% range 60.4–83.339.895% range 29.7–50.2
Solved12/249 passed, 3 judged equivalent13/2411 passed, 2 judged equivalent
Cost / tasknot recorded$7.05
Agent time / task21.6 min23.3 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 16 setups: bmk_d4ba310fdf50db4ccb2092e3.

See all 16 setups on the leaderboardHow Stet measures