GPT 5.6 Luna max vs Muse Wonder Full low
Muse Wonder Full low leads on speed and cost; quality is too close to call.
- Quality
- Even
- GPT 5.6 Luna max
- 7–3 head to head, 10 tied
- Speed
- 1.3× faster
- Muse Wonder Full low
- 21.6 min vs 28.5 min per task
- Cost
- 1.6× cheaper
- Muse Wonder Full low
- $2.85 vs $4.49 per task
Stet score
GPT 5.6 Luna maxcodex · max reasoningRank 2 of 16
70.395% range 57.6–82.2
Muse Wonder Full lowmuse · low reasoningRank 1 of 16
70.495% range 58.6–81.20.1 points higher
Quality
Head-to-head matchups
GPT 5.6 Luna max won7
Tied104 undecided
Muse Wonder Full low won3
Task by task
GPT 5.6 Luna max solved 1 task that Muse Wonder Full low didn’t, and Muse Wonder Full low solved 3 that GPT 5.6 Luna max didn’t. Both solved 9; neither solved 7.
On the 9 tasks both solved, judges preferred GPT 5.6 Luna max’s patch on 3 and called 6 even.
stet-15439c21Solved by 13 of 16 setups
- GPT 5.6 Luna maxFailed
- Muse Wonder Full lowPassed tests
Judges preferred Muse Wonder Full low’s patch
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 | GPT 5.6 Luna max | Muse Wonder Full low | Solved by | Better patch |
|---|---|---|---|---|
stet-3169aefa | Passed tests | Passed tests | Both | Even |
stet-89dfbc27 | Passed tests | Passed tests | Both | Even |
stet-b28f4fe7 | Passed tests | Passed tests | Both | Even |
stet-232b50ba | Passed tests | Passed tests | Both | GPT 5.6 Luna max |
stet-5276aa3f | Passed tests | Passed tests | Both | Even |
stet-commit-bbbbae09 | Passed tests | Passed tests | Both | GPT 5.6 Luna max |
stet-66762b4c | Equivalent to the merged fix | Equivalent to the merged fix | Both | Even |
stet-15439c21 | Failed | Passed tests | Muse Wonder Full low only | Muse Wonder Full low |
stet-commit-5d766dde | Equivalent to the merged fix | Equivalent to the merged fix | Both | Even |
stet-43493c52 | Passed tests | Passed tests | Both | GPT 5.6 Luna max |
stet-6f84e978 | Failed | Failed | Neither | Even |
stet-2450ca2d | Failed | Passed tests | Muse Wonder Full low only | Muse Wonder Full low |
stet-commit-342d0ac0 | Equivalent to the merged fix | Failed | GPT 5.6 Luna max only | GPT 5.6 Luna max |
stet-commit-60a0e6c2 | Failed | Failed | Neither | Even |
stet-commit-5e075641 | Failed | Failed | Neither | GPT 5.6 Luna max |
stet-commit-a8716b88 | Failed | Failed | Neither | GPT 5.6 Luna max |
stet-commit-e928166f | Failed | Equivalent to the merged fix | Muse Wonder Full low only | Muse Wonder Full low |
stet-commit-30506f8e | Failed | Failed | Neither | GPT 5.6 Luna max |
stet-commit-d2ab0c25 | Failed | Failed | Neither | Even |
stet-commit-e41c2e2d | Failed | Failed | Neither | Even |
Side by side
| Metric | GPT 5.6 Luna max | Muse Wonder Full low |
|---|---|---|
| Harness | codex | muse |
| Reasoning effort | max | low |
| Rank | 2 of 16 | 1 of 16 |
| Stet score | 70.395% range 57.6–82.2 | 70.495% range 58.6–81.2 |
| Solved | 10/247 passed, 3 judged equivalent | 12/249 passed, 3 judged equivalent |
| Cost / task | $4.49 | $2.85 |
| Agent time / task | 28.5 min | 21.6 min |
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 repoAbout 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.