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GPT 6 Luna low vs Pareto 26.9

Pareto 26.9 leads on quality: 37.9 points higher; 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 lowRank 14 of 14

21.295% range 12.5–31.2

Pareto 26.9Rank 5 of 14

59.195% range 48.8–69.237.9 points higher

Their 95% score ranges don’t overlap.

Cost / task

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

Agent time / task

GPT 6 Luna low6.9 min5.7× faster
Pareto 26.939.2 min

Task by task

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

GPT 6 Luna low only 0

Pareto 26.9 only 8

  • stet-5276aa3fPassed tests
  • stet-commit-bbbbae09Passed tests
  • stet-66762b4cPassed tests
  • stet-commit-f0caded9Equivalent to the merged fix
  • stet-43493c52Passed tests
  • stet-6f84e978Passed tests
  • stet-commit-f8ae1177Passed tests
  • stet-2450ca2dPassed 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 26.9Solved by
stet-3169aefaPassed testsPassed testsBoth
stet-89dfbc27Passed testsPassed testsBoth
stet-b28f4fe7Passed testsPassed testsBoth
stet-232b50baPassed testsPassed testsBoth
stet-5276aa3fFailedPassed testsPareto 26.9 only
stet-commit-bbbbae09No change madePassed testsPareto 26.9 only
stet-15439c21Passed testsPassed testsBoth
stet-66762b4cFailedPassed testsPareto 26.9 only
stet-commit-f0caded9FailedEquivalent to the merged fixPareto 26.9 only
stet-commit-5d766ddeNo change madeFailedNeither
stet-43493c52FailedPassed testsPareto 26.9 only
stet-6f84e978FailedPassed testsPareto 26.9 only
stet-commit-f8ae1177No change madePassed testsPareto 26.9 only
stet-2450ca2dFailedPassed testsPareto 26.9 only
stet-commit-342d0ac0FailedFailedNeither
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
MetricGPT 6 Luna lowPareto 26.9
Rank14 of 145 of 14
Stet score21.295% range 12.5–31.259.195% range 48.8–69.2
Solved5/245 passed, 0 judged equivalent13/2412 passed, 1 judged equivalent
Passed review5/204 not recorded8/24
Matched merged change5/204 not recorded9/24
Cost / task$0.05$12.47
How cost was recordedreported by its harnessreported by its harness on 23, estimated from tokens on 1
Agent time / task6.9 min39.2 min
Ran inDaytona sandboxDaytona sandbox

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.

Pareto 26.9 matched the merged change more often: 7 of 11 to GPT 6 Luna low’s 5.

Changes up to 150 lines
GPT 6 Luna lowPareto 26.9
Matched merged change5/117/11
Passed review5/117/11
Cost / task$0.02$5.74
Agent time / task2.1 min29.4 min

Small fixes

7 tasks

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

GPT 6 Luna low matched the merged change more often: 5 of 7 to Pareto 26.9’s 4.

Small fixes
GPT 6 Luna lowPareto 26.9
Matched merged change5/74/7
Passed review5/75/7
Cost / task$0.01$5.42
Agent time / task2.1 min30.6 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.

Larger changes
GPT 6 Luna lowPareto 26.9
Matched merged change0/94 not recorded2/13
Passed review0/94 not recorded1/13
Cost / task$0.08$18.18
Agent time / task11.0 min47.4 min

See which setup wins on your repo

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