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GPT 6 Luna low vs Pareto 26.9 medium

Pareto 26.9 medium leads on quality: won 19, tied 3, lost 1, 1 undecided head to head; GPT 6 Luna low leads on cost and agent time: 233.8× cheaper and 5.7× faster.

24 tasksData from

Stet score

GPT 6 Luna lowcodex · low reasoningRank 16 of 16

19.995% range 11.6–29.5

Pareto 26.9 mediumclaude-code · medium reasoningRank 7 of 16

57.195% range 47.0–66.737.2 points higher

Their 95% score ranges don’t overlap.

Cost / task

GPT 6 Luna low$0.05233.8× cheaper
Pareto 26.9 medium$12.47

Agent time / task

GPT 6 Luna low6.9 min5.7× faster
Pareto 26.9 medium39.2 min

Quality

Head-to-head matchups

GPT 6 Luna low won1

Tied31 undecided

Pareto 26.9 medium won19

Pareto 26.9 medium’s win share 91%, 95% range 81–98%Ties are within judge noise.

Task by task

GPT 6 Luna low solved 0 tasks that Pareto 26.9 medium didn’t, and Pareto 26.9 medium solved 8 that GPT 6 Luna low didn’t. Both solved 5; neither solved 10.

GPT 6 Luna low only 0

Pareto 26.9 medium only 8

  • stet-5276aa3fPassed tests
  • stet-commit-bbbbae09Passed tests
  • stet-66762b4cPassed tests
  • stet-43493c52Passed tests
  • stet-commit-f0caded9Equivalent to the merged fix
  • stet-6f84e978Passed tests
  • stet-2450ca2dPassed tests
  • stet-commit-f8ae1177Passed 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. 1 of the 24 tasks is left out because one of the two has no scored result on it.

All 23 compared tasks
Task by task
TaskGPT 6 Luna lowPareto 26.9 mediumSolved by
stet-3169aefaPassed testsPassed testsBoth
stet-89dfbc27Passed testsPassed testsBoth
stet-b28f4fe7Passed testsPassed testsBoth
stet-232b50baPassed testsPassed testsBoth
stet-5276aa3fFailedPassed testsPareto 26.9 medium only
stet-commit-bbbbae09No change madePassed testsPareto 26.9 medium only
stet-66762b4cFailedPassed testsPareto 26.9 medium only
stet-15439c21Passed testsPassed testsBoth
stet-commit-5d766ddeNo change madeFailedNeither
stet-43493c52FailedPassed testsPareto 26.9 medium only
stet-commit-f0caded9FailedEquivalent to the merged fixPareto 26.9 medium only
stet-6f84e978FailedPassed testsPareto 26.9 medium only
stet-2450ca2dFailedPassed testsPareto 26.9 medium only
stet-commit-342d0ac0FailedFailedNeither
stet-commit-f8ae1177No change madePassed testsPareto 26.9 medium only
stet-commit-5e075641FailedFailedNeither
stet-commit-2826765eFailedFailedNeither
stet-commit-a8716b88FailedFailedNeither
stet-commit-e928166fFailedFailedNeither
stet-commit-30506f8eFailedFailedNeither
stet-commit-87814583FailedFailedNeither
stet-commit-d2ab0c25FailedFailedNeither
stet-commit-e41c2e2dFailedFailedNeither

Side by side

Side by side
MetricGPT 6 Luna lowPareto 26.9 medium
Harnesscodexclaude-code
Reasoning effortlowmedium
Rank16 of 167 of 16
Stet score19.995% range 11.6–29.557.195% range 47.0–66.7
Solved5/245 passed, 0 judged equivalent13/2412 passed, 1 judged equivalent
Cost / task$0.05$12.47
Agent time / task6.9 min39.2 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