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GPT 5.6 Luna low vs Muse Wonder Full low

Muse Wonder Full low leads on quality; GPT 5.6 Luna low on speed and cost.

Quality
+7.1 pts
Muse Wonder Full low
4–0 head to head, 20 tied
Not yet conclusive across all 136 comparisons on the board.
Speed
3.2× faster
GPT 5.6 Luna low
6.7 min vs 21.6 min per task
Cost
55.9× cheaper
GPT 5.6 Luna low
$0.05 vs $2.85 per task

24 tasksData from

Stet score

GPT 5.6 Luna lowcodex · low reasoningRank 15 of 17

45.095% range 39.1–50.4

Muse Wonder Full lowlow reasoningRank 7 of 17

52.195% range 48.7–55.97.1 points higher

A directional read: their 95% score ranges overlap.

Quality

Head-to-head matchups

GPT 5.6 Luna low won0

Tied20

Muse Wonder Full low won4

Muse Wonder Full low’s win share 59%, 95% range 51–67%Ties are within judge noise.

Task by task

GPT 5.6 Luna low solved 0 tasks that Muse Wonder Full low didn’t, and Muse Wonder Full low solved 4 that GPT 5.6 Luna low didn’t. Both solved 10; neither solved 10.

stet-commit-bbbbae09Solved by 15 of 17 setups

  • GPT 5.6 Luna lowFailed
  • Muse Wonder Full lowPassed 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.

All 24 compared tasks
Task by task
TaskGPT 5.6 Luna lowMuse Wonder Full lowSolved by
stet-232b50baPassed testsPassed testsBoth
stet-3169aefaPassed testsPassed testsBoth
stet-5276aa3fPassed testsPassed testsBoth
stet-89dfbc27Passed testsPassed testsBoth
stet-b28f4fe7Passed testsPassed testsBoth
stet-commit-bbbbae09FailedPassed testsMuse Wonder Full low only
stet-66762b4cEquivalent to the merged fixPassed testsBoth
stet-commit-5d766ddeEquivalent to the merged fixEquivalent to the merged fixBoth
stet-commit-f0caded9Equivalent to the merged fixEquivalent to the merged fixBoth
stet-43493c52Passed testsPassed testsBoth
stet-commit-f8ae1177FailedPassed testsMuse Wonder Full low only
stet-15439c21Equivalent to the merged fixEquivalent to the merged fixBoth
stet-2450ca2dFailedPassed testsMuse Wonder Full low only
stet-commit-342d0ac0FailedFailedNeither
stet-6f84e978FailedFailedNeither
stet-commit-60a0e6c2FailedFailedNeither
stet-commit-5e075641FailedFailedNeither
stet-commit-2826765eFailedFailedNeither
stet-commit-a8716b88FailedFailedNeither
stet-commit-e928166fFailedEquivalent to the merged fixMuse Wonder Full low only
stet-commit-30506f8eFailedFailedNeither
stet-commit-87814583FailedFailedNeither
stet-commit-d2ab0c25FailedFailedNeither
stet-commit-e41c2e2dFailedFailedNeither

Side by side

Side by side
MetricGPT 5.6 Luna lowMuse Wonder Full low
Harnesscodex—
Reasoning effortlowlow
Rank15 of 177 of 17
Stet score45.095% range 39.1–50.452.195% range 48.7–55.9
Solved10/246 passed, 4 judged equivalent14/2410 passed, 4 judged equivalent
Cost / task$0.05$2.85
Agent time / task6.7 min21.6 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 17 setups: bmk_d4ba310fdf50db4ccb2092e3.

See all 17 setups on the leaderboardHow Stet measures